File Coverage

blib/lib/Geo/FIT.pm

Criterion	Covered	Total	%
statement	606	998	60.7
branch	279	574	48.6
condition	29	78	37.1
subroutine	70	97	72.1
pod	32	83	38.5
total	1016	1830	55.5

package Geo::FIT;
use strict;
use warnings;

our $VERSION = '1.13';

=encoding utf-8

=head1 NAME

Geo::FIT - Decode Garmin FIT files

=head1 SYNOPSIS

    use Geo::FIT;

Create an instance, assign a FIT file to it, open it:

    my $fit = Geo::FIT->new();
    $fit->file( $fname );
    $fit->open or die $fit->error;

Register a callback to get some info on where we've been and when:

    my $record_callback = sub {
        my ($self, $descriptor, $values) = @_;

        my $time= $self->field_value( 'timestamp',     $descriptor, $values );
        my $lat = $self->field_value( 'position_lat',  $descriptor, $values );
        my $lon = $self->field_value( 'position_long', $descriptor, $values );

        print "Time was: ", join("\t", $time, $lat, $lon), "\n"
        };

    $fit->data_message_callback_by_name('record', $record_callback ) or die $fit->error;

    my @header_things = $fit->fetch_header;

    1 while ( $fit->fetch );

    $fit->close;

=head1 DESCRIPTION

C is a Perl class to provide interfaces to decode Garmin FIT files (*.fit).

The module also provides a script to read and print the contents of FIT files (L), a script to convert FIT files to TCX files (L), and a script to convert a locations file to GPX format (L).

=cut

use Carp qw/ croak /;
use FileHandle;
use POSIX qw(BUFSIZ);
use Time::Local;
use Scalar::Util qw(blessed looks_like_number);

my $uint64_invalid;
BEGIN {
    eval { $uint64_invalid = unpack('Q', pack('a', -1)) };
    unless (defined $uint64_invalid) {
        require Math::BigInt;
        import  Math::BigInt
    }
}

require Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw(
                FIT_ENUM
                FIT_SINT8
                FIT_UINT8
                FIT_SINT16
                FIT_UINT16
                FIT_SINT32
                FIT_UINT32
                FIT_SINT64
                FIT_UINT64
                FIT_STRING
                FIT_FLOAT32
                FIT_FLOAT64
                FIT_UINT8Z
                FIT_UINT16Z
                FIT_UINT32Z
                FIT_UINT64Z
                FIT_BYTE
                FIT_BASE_TYPE_MAX
                FIT_HEADER_LENGTH
                );

sub FIT_ENUM() {0;}
sub FIT_SINT8() {1;}
sub FIT_UINT8() {2;}
sub FIT_SINT16() {3;}
sub FIT_UINT16() {4;}
sub FIT_SINT32() {5;}
sub FIT_UINT32() {6;}
sub FIT_STRING() {7;}
sub FIT_FLOAT32() {8;}
sub FIT_FLOAT64() {9;}
sub FIT_UINT8Z() {10;}
sub FIT_UINT16Z() {11;}
sub FIT_UINT32Z() {12;}
sub FIT_BYTE() {13;}
sub FIT_SINT64() {14;}
sub FIT_UINT64() {15;}
sub FIT_UINT64Z() {16;}
sub FIT_BASE_TYPE_MAX() {FIT_UINT64Z;}

my ($rechd_offset_compressed_timestamp_header, $rechd_mask_compressed_timestamp_header,
    $rechd_offset_cth_local_message_type, $rechd_length_cth_local_message_type,
    $rechd_mask_cth_local_message_type, $rechd_length_cth_timestamp, $rechd_mask_cth_timestamp,
    $rechd_offset_definition_message, $rechd_mask_definition_message, $rechd_offset_devdata_message,
    $rechd_mask_devdata_message, $rechd_length_local_message_type, $rechd_mask_local_message_type,
    $cthd_offset_local_message_type, $cthd_length_local_message_type, $cthd_mask_local_message_type,
    $cthd_length_time_offset, $cthd_mask_time_offset
    );

$rechd_offset_compressed_timestamp_header =  7;
$rechd_mask_compressed_timestamp_header   =  1 << $rechd_offset_compressed_timestamp_header;
$rechd_offset_cth_local_message_type      =  5;
$rechd_length_cth_local_message_type      =  2;
$rechd_mask_cth_local_message_type        =  ((1 << $rechd_length_cth_local_message_type) - 1) << $rechd_offset_cth_local_message_type;
$rechd_length_cth_timestamp               =  $rechd_offset_cth_local_message_type;
$rechd_mask_cth_timestamp                 =  (1 << $rechd_length_cth_timestamp) - 1;
$rechd_offset_definition_message          =  6;
$rechd_mask_definition_message            =  1 << $rechd_offset_definition_message;
$rechd_offset_devdata_message             =  5;
$rechd_mask_devdata_message               =  1 << $rechd_offset_devdata_message;
$rechd_length_local_message_type          =  4;
$rechd_mask_local_message_type            =  (1 << $rechd_length_local_message_type) - 1;
$cthd_offset_local_message_type           =  5;
$cthd_length_local_message_type           =  2;
$cthd_mask_local_message_type             =  (1 << $cthd_length_local_message_type) - 1;
$cthd_length_time_offset                  =  5;
$cthd_mask_time_offset                    =  (1 << $cthd_length_time_offset) - 1;

my ($defmsg_min_template, $defmsg_min_length);
$defmsg_min_template  =  'C C C S C';
$defmsg_min_length    =  length(pack($defmsg_min_template));

my ($deffld_template, $deffld_length, $deffld_mask_endian_p, $deffld_mask_type);
$deffld_template       =  'C C C';
$deffld_length         =  length(pack($deffld_template));
$deffld_mask_endian_p  =  1 << 7;
$deffld_mask_type      =  (1 << 5) - 1;

my ($devdata_min_template, $devdata_min_length, $devdata_deffld_template, $devdata_deffld_length);
$devdata_min_template    = 'C';
$devdata_min_length      = length(pack($devdata_min_template));
$devdata_deffld_template = 'C C C';
$devdata_deffld_length   = length(pack($deffld_template));

my @invalid = (0xFF) x ($deffld_mask_type + 1);
$invalid[FIT_SINT8] = 0x7F;
$invalid[FIT_SINT16] = 0x7FFF;
$invalid[FIT_UINT16] = 0xFFFF;
$invalid[FIT_SINT32] = 0x7FFFFFFF;
$invalid[FIT_UINT32] = 0xFFFFFFFF;
$invalid[FIT_STRING] = $invalid[FIT_UINT8Z] = $invalid[FIT_UINT16Z] = $invalid[FIT_UINT32Z] = $invalid[FIT_UINT64Z] = 0;
#$invalid[FIT_FLOAT32] = NaN;
#$invalid[FIT_FLOAT64] = NaN;
$invalid[FIT_FLOAT32] = unpack('f', pack('V', 0xFFFFFFFF));
$invalid[FIT_FLOAT64] = unpack('d', pack('V V', 0xFFFFFFFF, 0xFFFFFFFF));

my ($big_int_base32, $sint64_2c_mask, $sint64_2c_base, $sint64_2c_sign);

if (defined $uint64_invalid) {
    $invalid[FIT_UINT64] = $uint64_invalid;
    $invalid[FIT_SINT64] = eval '0x7FFFFFFFFFFFFFFF';
} else {
    $invalid[FIT_UINT64] = Math::BigInt->new('0xFFFFFFFFFFFFFFFF');
    $invalid[FIT_SINT64] = Math::BigInt->new('0x7FFFFFFFFFFFFFFF');
    $big_int_base32 = Math::BigInt->new('0x100000000');
    $sint64_2c_mask = Math::BigInt->new('0xFFFFFFFFFFFFFFFF');
    $sint64_2c_base = Math::BigInt->new('0x10000000000000000');
    $sint64_2c_sign = Math::BigInt->new('0x1000000000000000');
}

sub packfilter_uint64_big_endian {
    my @res = $_[0]->bdiv($big_int_base32);
    @res;
}

sub packfilter_uint64_little_endian {
    my @res = $_[0]->bdiv($big_int_base32);
    @res[1, 0];
}

my $my_endian = unpack('L', pack('N', 1)) == 1 ? 1 : 0;

*packfilter_uint64 = $my_endian ? \&packfilter_uint64_big_endian : \&packfilter_uint64_little_endian;

sub unpackfilter_uint64_big_endian {
    my ($hi, $lo) = @_;
    Math::BigInt->new($hi)->blsft(32)->badd($lo);
}

sub unpackfilter_uint64_little_endian {
    &unpackfilter_uint64_big_endian(@_[1, 0]);
}

*unpackfilter_uint64 = $my_endian ? \&unpackfilter_uint64_big_endian : \&unpackfilter_uint64_little_endian;

sub packfilter_sint64_big_endian {
    if ($_[0]->bcmp(0) < 0) {
        &packfilter_uint64_big_endian($sint64_2c_mask->band($sint64_2c_base->badd($_[0])));
    } else {
        &packfilter_uint64_big_endian($_[0]);
    }
}

sub packfilter_sint64_little_endian {
    if ($_[0]->bcmp(0) < 0) {
        &packfilter_uint64_little_endian($sint64_2c_mask->band($sint64_2c_base->badd($_[0])));
    } else {
        &packfilter_uint64_little_endian($_[0]);
    }
}

*packfilter_sint64 = $my_endian ? \&packfilter_sint64_big_endian : \&packfilter_sint64_little_endian;

sub unpackfilter_sint64_big_endian {
    my ($hi, $lo) = @_;
    my $n = Math::BigInt->new($hi)->blsft(32)->badd($lo)->band($sint64_2c_mask);

    if ($n->band($sint64_2c_sign)->bcmp(0) == 0) {
        $n;
    } else {
        $n->bsub($sint64_2c_base);
    }
}

sub unpackfilter_sint64_little_endian {
    &unpackfilter_sint64_big_endian(@_[1, 0]);
}

*unpackfilter_sint64 = $my_endian ? \&unpackfilter_sint64_big_endian : \&unpackfilter_sint64_little_endian;

sub invalid {
    my ($self, $type) = @_;
    $invalid[$type & $deffld_mask_type];
}

my @size = (1) x ($deffld_mask_type + 1);
$size[FIT_SINT16] = $size[FIT_UINT16] = $size[FIT_UINT16Z] = 2;
$size[FIT_SINT32] = $size[FIT_UINT32] = $size[FIT_UINT32Z] = $size[FIT_FLOAT32] = 4;
$size[FIT_FLOAT64] = $size[FIT_SINT64] = $size[FIT_UINT64] = $size[FIT_UINT64Z] = 8;

my (@template, @packfactor, @packfilter, @unpackfilter);
@template     = ('C') x ($deffld_mask_type + 1);
@packfactor   = (1) x ($deffld_mask_type + 1);
@packfilter   = (undef) x ($deffld_mask_type + 1);
@unpackfilter = (undef) x ($deffld_mask_type + 1);

$template[FIT_SINT8] = 'c';
$template[FIT_SINT16] = 's';
$template[FIT_UINT16] = $template[FIT_UINT16Z] = 'S';
$template[FIT_SINT32] = 'l';
$template[FIT_UINT32] = $template[FIT_UINT32Z] = 'L';
$template[FIT_FLOAT32] = 'f';
$template[FIT_FLOAT64] = 'd';

if (defined $uint64_invalid) {
    $template[FIT_SINT64] = 'q';
    $template[FIT_UINT64] = $template[FIT_UINT64Z] = 'Q';
} else {
    $template[FIT_SINT64] = $template[FIT_UINT64] = $template[FIT_UINT64Z] = 'L';
    $packfactor[FIT_SINT64] = $packfactor[FIT_UINT64] = $packfactor[FIT_UINT64Z] = 2;
    $packfilter[FIT_SINT64] = \&packfilter_sint64;
    $unpackfilter[FIT_SINT64] = \&unpackfilter_sint64;
    $packfilter[FIT_UINT64] = $packfilter[FIT_UINT64Z] = \&packfilter_uint64;
    $unpackfilter[FIT_UINT64] = $unpackfilter[FIT_UINT64Z] = \&unpackfilter_uint64;
}

my %named_type = (
    'file' => +{
        '_base_type' => FIT_ENUM,
        'device' => 1,
        'settings' => 2,
        'sport' => 3,
        'activity' => 4,
        'workout' => 5,
        'course' => 6,
        'schedules' => 7,
        'weight' => 9,
        'totals' => 10,
        'goals' => 11,
        'blood_pressure' => 14,
        'monitoring_a' => 15,
        'activity_summary' => 20,
        'monitoring_daily' => 28,
        'monitoring_b' => 32,
        'segment' => 34,
        'segment_list' => 35,
        'exd_configuration' => 40,
        'mfg_range_min' => 0xF7,
        'mfg_range_max' => 0xFE,
    },

    'mesg_num' => +{
        '_base_type' => FIT_UINT16,
        'file_id' => 0,
        'capabilities' => 1,
        'device_settings' => 2,
        'user_profile' => 3,
        'hrm_profile' => 4,
        'sdm_profile' => 5,
        'bike_profile' => 6,
        'zones_target' => 7,
        'hr_zone' => 8,
        'power_zone' => 9,
        'met_zone' => 10,
        'sport' => 12,
        'goal' => 15,
        'session' => 18,
        'lap' => 19,
        'record' => 20,
        'event' => 21,
        'source' => 22, # undocumented
        'device_info' => 23,
        'workout' => 26,
        'workout_step' => 27,
        'schedule' => 28,
        'location' => 29, # undocumented
        'weight_scale' => 30,
        'course' => 31,
        'course_point' => 32,
        'totals' => 33,
        'activity' => 34,
        'software' => 35,
        'file_capabilities' => 37,
        'mesg_capabilities' => 38,
        'field_capabilities' => 39,
        'file_creator' => 49,
        'blood_pressure' => 51,
        'speed_zone' => 53,
        'monitoring' => 55,
        'training_file' => 72,
        'hrv' => 78,
        'ant_rx' => 80,
        'ant_tx' => 81,
        'ant_channel_id' => 82,
        'length' => 101,
        'monitoring_info' => 103,
        'battery' => 104, # undocumented
        'pad' => 105,
        'slave_device' => 106,
        'connectivity' => 127,
        'weather_conditions' => 128,
        'weather_alert' => 129,
        'cadence_zone' => 131,
        'hr' => 132,
        'segment_lap' => 142,
        'memo_glob' => 145,
        'sensor' => 147, # undocumented
        'segment_id' => 148,
        'segment_leaderboard_entry' => 149,
        'segment_point' => 150,
        'segment_file' => 151,
        'workout_session' => 158,
        'watchface_settings' => 159,
        'gps_metadata' => 160,
        'camera_event' => 161,
        'timestamp_correlation' => 162,
        'gyroscope_data' => 164,
        'accelerometer_data' => 165,
        'three_d_sensor_calibration' => 167,
        'video_frame' => 169,
        'obdii_data' => 174,
        'nmea_sentence' => 177,
        'aviation_attitude' => 178,
        'video' => 184,
        'video_title' => 185,
        'video_description' => 186,
        'video_clip' => 187,
        'ohr_settings' => 188,
        'exd_screen_configuration' => 200,
        'exd_data_field_configuration' => 201,
        'exd_data_concept_configuration' => 202,
        'field_description' => 206,
        'developer_data_id' => 207,
        'magnetometer_data' => 208,
        'barometer_data' => 209,
        'one_d_sensor_calibration' => 210,
        'monitoring_hr_data' => 211,
        'time_in_zone' => 216,
        'set' => 225,
        'stress_level' => 227,
        'max_met_data' => 229,
        'dive_settings' => 258,
        'dive_gas' => 259,
        'dive_alarm' => 262,
        'exercise_title' => 264,
        'dive_summary' => 268,
        'spo2_data' => 269,
        'sleep_level' => 275,
        'jump' => 285,
        'aad_accel_features' => 289,
        'beat_intervals' => 290,
        'respiration_rate' => 297,
        'hsa_accelerometer_data' => 302,
        'hsa_step_data' => 304,
        'hsa_spo2_data' => 305,
        'hsa_stress_data' => 306,
        'hsa_respiration_data' => 307,
        'hsa_heart_rate_data' => 308,
        'split' => 312,
        'split_summary' => 313,
        'hsa_body_battery_data' => 314,
        'hsa_event' => 315,
        'climb_pro' => 317,
        'tank_update' => 319,
        'tank_summary' => 323,
        'sleep_assessment' => 346,
        'hrv_status_summary' => 370,
        'hrv_value' => 371,
        'raw_bbi' => 372,
        'device_aux_battery_info' => 375,
        'hsa_gyroscope_data' => 376,
        'chrono_shot_session' => 387,
        'chrono_shot_data' => 388,
        'hsa_configuration_data' => 389,
        'dive_apnea_alarm' => 393,
        'skin_temp_overnight' => 398,
        'hsa_wrist_temperature_data' => 409, # Message number for the HSA wrist temperature data message
        'mfg_range_min' => 0xFF00, # 0xFF00 - 0xFFFE reserved for manufacturer specific messages
        'mfg_range_max' => 0xFFFE,
    },

    'checksum' => +{
        '_base_type' => FIT_UINT8,
        'clear' => 0,
        'ok' => 1,
    },

    'file_flags' => +{
        '_base_type' => FIT_UINT8Z,
        '_mask' => 1,
        'read' => 0x02,
        'write' => 0x04,
        'erase' => 0x08,
    },

    'mesg_count' => +{
        '_base_type' => FIT_ENUM,
        'num_per_file' => 0,
        'max_per_file' => 1,
        'max_per_file_type' => 2,
    },

    'date_time' => +{
        '_base_type' => FIT_UINT32,
        'min' => 0x10000000,
        '_min' => 0x10000000,
        '_out_of_range' => 'seconds from device power on',
        '_offset' => -timegm(0, 0, 0, 31, 11, 1989), # 1989-12-31 00:00:00 UTC
    },

    'local_date_time' => +{ # same as above, but in local time zone
        '_base_type' => FIT_UINT32,
        'min' => 0x10000000,
    },

    'message_index' => +{
        '_base_type' => FIT_UINT16,
        '_mask' => 1,
        'selected' => 0x8000,
        'reserved' => 0x7000,
        'mask' => 0x0FFF,
    },

    'device_index' => +{ # dynamically created, as devices are added
        '_base_type' => FIT_UINT8,
        'creator' => 0, # creator of the file is always device index 0
        'device1' => 1, # local, v6.00, garmin prod. edge520 (2067)
        'device2' => 2, # local, v3.00, garmin prod. 1619
        'heart_rate' => 3, # antplus
        'speed' => 4, # antplus
        'cadence' => 5, # antplus
        'device6' => 6, # antplus power?
    },

    'gender' => +{
        '_base_type' => FIT_ENUM,
        'female' => 0,
        'male' => 1,
    },

    'language' => +{
        '_base_type' => FIT_ENUM,
        'english' => 0,
        'french' => 1,
        'italian' => 2,
        'german' => 3,
        'spanish' => 4,
        'croatian' => 5,
        'czech' => 6,
        'danish' => 7,
        'dutch' => 8,
        'finnish' => 9,
        'greek' => 10,
        'hungarian' => 11,
        'norwegian' => 12,
        'polish' => 13,
        'portuguese' => 14,
        'slovakian' => 15,
        'slovenian' => 16,
        'swedish' => 17,
        'russian' => 18,
        'turkish' => 19,
        'latvian' => 20,
        'ukrainian' => 21,
        'arabic' => 22,
        'farsi' => 23,
        'bulgarian' => 24,
        'romanian' => 25,
        'chinese' => 26,
        'japanese' => 27,
        'korean' => 28,
        'taiwanese' => 29,
        'thai' => 30,
        'hebrew' => 31,
        'brazilian_portuguese' => 32,
        'indonesian' => 33,
        'malaysian' => 34,
        'vietnamese' => 35,
        'burmese' => 36,
        'mongolian' => 37,
        'custom' => 254,
    },

    'language_bits_0' => +{
        '_base_type' => FIT_UINT8Z,
        'english' => 0x01,
        'french' => 0x02,
        'italian' => 0x04,
        'german' => 0x08,
        'spanish' => 0x10,
        'croatian' => 0x20,
        'czech' => 0x40,
        'danish' => 0x80,
    },

    'language_bits_1' => +{
        '_base_type' => FIT_UINT8Z,
        'dutch' => 0x01,
        'finnish' => 0x02,
        'greek' => 0x04,
        'hungarian' => 0x08,
        'norwegian' => 0x10,
        'polish' => 0x20,
        'portuguese' => 0x40,
        'slovakian' => 0x80,
    },

    'language_bits_2' => +{
        '_base_type' => FIT_UINT8Z,
        'slovenian' => 0x01,
        'swedish' => 0x02,
        'russian' => 0x04,
        'turkish' => 0x08,
        'latvian' => 0x10,
        'ukrainian' => 0x20,
        'arabic' => 0x40,
        'farsi' => 0x80,
    },

    'language_bits_3' => +{
        '_base_type' => FIT_UINT8Z,
        'bulgarian' => 0x01,
        'romanian' => 0x02,
        'chinese' => 0x04,
        'japanese' => 0x08,
        'korean' => 0x10,
        'taiwanese' => 0x20,
        'thai' => 0x40,
        'hebrew' => 0x80,
    },

    'language_bits_4' => +{
        '_base_type' => FIT_UINT8Z,
        'brazilian_portuguese' => 0x01,
        'indonesian' => 0x02,
        'malaysian' => 0x04,
        'vietnamese' => 0x08,
        'burmese' => 0x10,
        'mongolian' => 0x20,
    },

    'time_zone' => +{
        '_base_type' => FIT_ENUM,
        'almaty' => 0,
        'bangkok' => 1,
        'bombay' => 2,
        'brasilia' => 3,
        'cairo' => 4,
        'cape_verde_is' => 5,
        'darwin' => 6,
        'eniwetok' => 7,
        'fiji' => 8,
        'hong_kong' => 9,
        'islamabad' => 10,
        'kabul' => 11,
        'magadan' => 12,
        'mid_atlantic' => 13,
        'moscow' => 14,
        'muscat' => 15,
        'newfoundland' => 16,
        'samoa' => 17,
        'sydney' => 18,
        'tehran' => 19,
        'tokyo' => 20,
        'us_alaska' => 21,
        'us_atlantic' => 22,
        'us_central' => 23,
        'us_eastern' => 24,
        'us_hawaii' => 25,
        'us_mountain' => 26,
        'us_pacific' => 27,
        'other' => 28,
        'auckland' => 29,
        'kathmandu' => 30,
        'europe_western_wet' => 31,
        'europe_central_cet' => 32,
        'europe_eastern_eet' => 33,
        'jakarta' => 34,
        'perth' => 35,
        'adelaide' => 36,
        'brisbane' => 37,
        'tasmania' => 38,
        'iceland' => 39,
        'amsterdam' => 40,
        'athens' => 41,
        'barcelona' => 42,
        'berlin' => 43,
        'brussels' => 44,
        'budapest' => 45,
        'copenhagen' => 46,
        'dublin' => 47,
        'helsinki' => 48,
        'lisbon' => 49,
        'london' => 50,
        'madrid' => 51,
        'munich' => 52,
        'oslo' => 53,
        'paris' => 54,
        'prague' => 55,
        'reykjavik' => 56,
        'rome' => 57,
        'stockholm' => 58,
        'vienna' => 59,
        'warsaw' => 60,
        'zurich' => 61,
        'quebec' => 62,
        'ontario' => 63,
        'manitoba' => 64,
        'saskatchewan' => 65,
        'alberta' => 66,
        'british_columbia' => 67,
        'boise' => 68,
        'boston' => 69,
        'chicago' => 70,
        'dallas' => 71,
        'denver' => 72,
        'kansas_city' => 73,
        'las_vegas' => 74,
        'los_angeles' => 75,
        'miami' => 76,
        'minneapolis' => 77,
        'new_york' => 78,
        'new_orleans' => 79,
        'phoenix' => 80,
        'santa_fe' => 81,
        'seattle' => 82,
        'washington_dc' => 83,
        'us_arizona' => 84,
        'chita' => 85,
        'ekaterinburg' => 86,
        'irkutsk' => 87,
        'kaliningrad' => 88,
        'krasnoyarsk' => 89,
        'novosibirsk' => 90,
        'petropavlovsk_kamchatskiy' => 91,
        'samara' => 92,
        'vladivostok' => 93,
        'mexico_central' => 94,
        'mexico_mountain' => 95,
        'mexico_pacific' => 96,
        'cape_town' => 97,
        'winkhoek' => 98,
        'lagos' => 99,
        'riyahd' => 100,
        'venezuela' => 101,
        'australia_lh' => 102,
        'santiago' => 103,
        'manual' => 253,
        'automatic' => 254,
    },

    'display_measure' => +{
        '_base_type' => FIT_ENUM,
        'metric' => 0,
        'statute' => 1,
        'nautical' => 2,
    },

    'display_heart' => +{
        '_base_type' => FIT_ENUM,
        'bpm' => 0,
        'max' => 1,
        'reserve' => 2,
    },

    'display_power' => +{
        '_base_type' => FIT_ENUM,
        'watts' => 0,
        'percent_ftp' => 1,
    },

    'display_position' => +{
        '_base_type' => FIT_ENUM,
        'degree' => 0,
        'degree_minute' => 1,
        'degree_minute_second' => 2,
        'austrian_grid' => 3,
        'british_grid' => 4,
        'dutch_grid' => 5,
        'hungarian_grid' => 6,
        'finnish_grid' => 7,
        'german_grid' => 8,
        'icelandic_grid' => 9,
        'indonesian_equatorial' => 10,
        'indonesian_irian' => 11,
        'indonesian_southern' => 12,
        'india_zone_0' => 13,
        'india_zone_IA' => 14,
        'india_zone_IB' => 15,
        'india_zone_IIA' => 16,
        'india_zone_IIB' => 17,
        'india_zone_IIIA' => 18,
        'india_zone_IIIB' => 19,
        'india_zone_IVA' => 20,
        'india_zone_IVB' => 21,
        'irish_transverse' => 22,
        'irish_grid' => 23,
        'loran' => 24,
        'maidenhead_grid' => 25,
        'mgrs_grid' => 26,
        'new_zealand_grid' => 27,
        'new_zealand_transverse' => 28,
        'qatar_grid' => 29,
        'modified_swedish_grid' => 30,
        'swedish_grid' => 31,
        'south_african_grid' => 32,
        'swiss_grid' => 33,
        'taiwan_grid' => 34,
        'united_states_grid' => 35,
        'utm_ups_grid' => 36,
        'west_malayan' => 37,
        'borneo_rso' => 38,
        'estonian_grid' => 39,
        'latvian_grid' => 40,
        'swedish_ref_99_grid' => 41,
    },

    'switch' => +{
        '_base_type' => FIT_ENUM,
        'off' => 0,
        'on' => 1,
        'auto' => 2,
    },

    'sport' => +{
        '_base_type' => FIT_ENUM,
        'generic' => 0,
        'running' => 1,
        'cycling' => 2,
        'transition' => 3, # multisport transition
        'fitness_equipment' => 4,
        'swimming' => 5,
        'basketball' => 6,
        'soccer' => 7,
        'tennis' => 8,
        'american_football' => 9,
        'training' => 10,
        'walking' => 11,
        'cross_country_skiing' => 12,
        'alpine_skiing' => 13,
        'snowboarding' => 14,
        'rowing' => 15,
        'mountaineering' => 16,
        'hiking' => 17,
        'multisport' => 18,
        'paddling' => 19,
        'flying' => 20,
        'e_biking' => 21,
        'motorcycling' => 22,
        'boating' => 23,
        'driving' => 24,
        'golf' => 25,
        'hang_gliding' => 26,
        'horseback_riding' => 27,
        'hunting' => 28,
        'fishing' => 29,
        'inline_skating' => 30,
        'rock_climbing' => 31,
        'sailing' => 32,
        'ice_skating' => 33,
        'sky_diving' => 34,
        'snowshoeing' => 35,
        'snowmobiling' => 36,
        'stand_up_paddleboarding' => 37,
        'surfing' => 38,
        'wakeboarding' => 39,
        'water_skiing' => 40,
        'kayaking' => 41,
        'rafting' => 42,
        'windsurfing' => 43,
        'kitesurfing' => 44,
        'tactical' => 45,
        'jumpmaster' => 46,
        'boxing' => 47,
        'floor_climbing' => 48,
        'baseball' => 49,
        'diving' => 53,
        'hiit' => 62,
        'racket' => 64,
        'wheelchair_push_walk' => 65,
        'wheelchair_push_run' => 66,
        'meditation' => 67,
        'disc_golf' => 69,
        'cricket' => 71,
        'rugby' => 72,
        'hockey' => 73,
        'lacrosse' => 74,
        'volleyball' => 75,
        'water_tubing' => 76,
        'wakesurfing' => 77,
        'mixed_martial_arts' => 80,
        'snorkeling' => 82,
        'dance' => 83,
        'jump_rope' => 84,
        'all' => 254, # All is for goals only to include all sports.
    },

    'sport_bits_0' => +{
        '_base_type' => FIT_UINT8Z,
        'generic' => 0x01,
        'running' => 0x02,
        'cycling' => 0x04,
        'transition' => 0x08,
        'fitness_equipment' => 0x10,
        'swimming' => 0x20,
        'basketball' => 0x40,
        'soccer' => 0x80,
    },

    'sport_bits_1' => +{
        '_base_type' => FIT_UINT8Z,
        'tennis' => 0x01,
        'american_football' => 0x02,
        'training' => 0x04,
        'walking' => 0x08,
        'cross_country_skiing' => 0x10,
        'alpine_skiing' => 0x20,
        'snowboarding' => 0x40,
        'rowing' => 0x80,
    },

    'sport_bits_2' => +{
        '_base_type' => FIT_UINT8Z,
        'mountaineering' => 0x01,
        'hiking' => 0x02,
        'multisport' => 0x04,
        'paddling' => 0x08,
        'flying' => 0x10,
        'e_biking' => 0x20,
        'motorcycling' => 0x40,
        'boating' => 0x80,
    },

    'sport_bits_3' => +{
        '_base_type' => FIT_UINT8Z,
        'driving' => 0x01,
        'golf' => 0x02,
        'hang_gliding' => 0x04,
        'horseback_riding' => 0x08,
        'hunting' => 0x10,
        'fishing' => 0x20,
        'inline_skating' => 0x40,
        'rock_climbing' => 0x80,
    },

    'sport_bits_4' => +{
        '_base_type' => FIT_UINT8Z,
        'sailing' => 0x01,
        'ice_skating' => 0x02,
        'sky_diving' => 0x04,
        'snowshoeing' => 0x08,
        'snowmobiling' => 0x10,
        'stand_up_paddleboarding' => 0x20,
        'surfing' => 0x40,
        'wakeboarding' => 0x80,
    },

    'sport_bits_5' => +{
        '_base_type' => FIT_UINT8Z,
        'water_skiing' => 0x01,
        'kayaking' => 0x02,
        'rafting' => 0x04,
        'windsurfing' => 0x08,
        'kitesurfing' => 0x10,
        'tactical' => 0x20,
        'jumpmaster' => 0x40,
        'boxing' => 0x80,
    },

    'sport_bits_6' => +{
        '_base_type' => FIT_UINT8Z,
        'floor_climbing' => 0x01,
    },

    'sub_sport' => +{
        '_base_type' => FIT_ENUM,
        'generic' => 0,
        'treadmill' => 1, # run/fitness equipment
        'street' => 2, # run
        'trail' => 3, # run
        'track' => 4, # run
        'spin' => 5, # cycling
        'indoor_cycling' => 6, # cycling/fitness equipment
        'road' => 7, # cycling
        'mountain' => 8, # cycling
        'downhill' => 9, # cycling
        'recumbent' => 10, # cycling
        'cyclocross' => 11, # cycling
        'hand_cycling' => 12, # cycling
        'track_cycling' => 13, # cycling
        'indoor_rowing' => 14, # fitness equipment
        'elliptical' => 15, # fitness equipment
        'stair_climbing' => 16, # fitness equipment
        'lap_swimming' => 17, # swimming
        'open_water' => 18, # swimming
        'flexibility_training' => 19, # training
        'strength_training' => 20, # training
        'warm_up' => 21, # tennis
        'match' => 22, # tennis
        'exercise' => 23, # tennis
        'challenge' => 24,
        'indoor_skiing' => 25, # fitness equipment
        'cardio_training' => 26, # training
        'indoor_walking' => 27, # walking/fitness equipment
        'e_bike_fitness' => 28, # e-biking
        'bmx' => 29, # cycling
        'casual_walking' => 30, # walking
        'speed_walking' => 31, # walking
        'bike_to_run_transition' => 32, # transition
        'run_to_bike_transition' => 33, # transition
        'swim_to_bike_transition' => 34, # transition
        'atv' => 35, # motorcycling
        'motocross' => 36, # motorcycling
        'backcountry' => 37, # alpine skiing/snowboarding
        'resort' => 38, # alpine skiing/snowboarding
        'rc_drone' => 39, # flying
        'wingsuit' => 40, # flying
        'whitewater' => 41, # kayaking/rafting
        'skate_skiing' => 42, # cross country skiing
        'yoga' => 43, # training
        'pilates' => 44, # fitness equipment
        'indoor_running' => 45, # run/fitness equipment
        'gravel_cycling' => 46, # cycling
        'e_bike_mountain' => 47, # cycling
        'commuting' => 48, # cycling
        'mixed_surface' => 49, # cycling
        'navigate' => 50,
        'track_me' => 51,
        'map' => 52,
        'single_gas_diving' => 53, # Diving
        'multi_gas_diving' => 54, # Diving
        'gauge_diving' => 55, # Diving
        'apnea_diving' => 56, # Diving
        'apnea_hunting' => 57, # Diving
        'virtual_activity' => 58,
        'obstacle' => 59, # Used for events where participants run, crawl through mud, climb over walls, etc.
        'breathing' => 62,
        'sail_race' => 65, # Sailing
        'ultra' => 67, # Ultramarathon
        'indoor_climbing' => 68, # Climbing
        'bouldering' => 69, # Climbing
        'hiit' => 70, # High Intensity Interval Training
        'amrap' => 73, # HIIT
        'emom' => 74, # HIIT
        'tabata' => 75, # HIIT
        'pickleball' => 84, # Racket
        'padel' => 85, # Racket
        'indoor_wheelchair_walk' => 86,
        'indoor_wheelchair_run' => 87,
        'indoor_hand_cycling' => 88,
        'squash' => 94,
        'badminton' => 95,
        'racquetball' => 96,
        'table_tennis' => 97,
        'fly_canopy' => 110,        # Flying
        'fly_paraglide' => 111,     # Flying
        'fly_paramotor' => 112,     # Flying
        'fly_pressurized' => 113,   # Flying
        'fly_navigate' => 114,      # Flying
        'fly_timer' => 115,         # Flying
        'fly_altimeter' => 116,     # Flying
        'fly_wx' => 117,            # Flying
        'fly_vfr' => 118,           # Flying
        'fly_ifr' => 119,           # Flying
        'all' => 254,
    },

    'sport_event' => +{
        '_base_type' => FIT_ENUM,
        'uncategorized' => 0,
        'geocaching' => 1,
        'fitness' => 2,
        'recreation' => 3,
        'race' => 4,
        'special_event' => 5,
        'training' => 6,
        'transportation' => 7,
        'touring' => 8,
    },

    'activity' => +{
        '_base_type' => FIT_ENUM,
        'manual' => 0,
        'auto_multi_sport' => 1,
    },

    'intensity' => +{
        '_base_type' => FIT_ENUM,
        'active' => 0,
        'rest' => 1,
        'warmup' => 2,
        'cooldown' => 3,
    },

    'session_trigger' => +{
        '_base_type' => FIT_ENUM,
        'activity_end' => 0,
        'manual' => 1,
        'auto_multi_sport' => 2,
        'fitness_equipment' => 3,
    },

    'autolap_trigger' => +{
        '_base_type' => FIT_ENUM,
        'time' => 0,
        'distance' => 1,
        'position_start' => 2,
        'position_lap' => 3,
        'position_waypoint' => 4,
        'position_marked' => 5,
        'off' => 6,
    },

    'lap_trigger' => +{
        '_base_type' => FIT_ENUM,
        'manual' => 0,
        'time' => 1,
        'distance' => 2,
        'position_start' => 3,
        'position_lap' => 4,
        'position_waypoint' => 5,
        'position_marked' => 6,
        'session_end' => 7,
        'fitness_equipment' => 8,
    },

    'time_mode' => +{
        '_base_type' => FIT_ENUM,
        'hour12' => 0,
        'hour24' => 1,
        'military' => 2,
        'hour_12_with_seconds' => 3,
        'hour_24_with_seconds' => 4,
        'utc' => 5,
    },

    'backlight_mode' => +{
        '_base_type' => FIT_ENUM,
        'off' => 0,
        'manual' => 1,
        'key_and_messages' => 2,
        'auto_brightness' => 3,
        'smart_notifications' => 4,
        'key_and_messages_night' => 5,
        'key_and_messages_and_smart_notifications' => 6,
    },

    'date_mode' => +{
        '_base_type' => FIT_ENUM,
        'day_month' => 0,
        'month_day' => 1,
    },

    'backlight_timeout' => +{
        '_base_type' => FIT_UINT8,
        'infinite' => 0,
    },

    'event' => +{
        '_base_type' => FIT_ENUM,
        'timer' => 0,
        'workout' => 3,
        'workout_step' => 4,
        'power_down' => 5,
        'power_up' => 6,
        'off_course' => 7,
        'session' => 8,
        'lap' => 9,
        'course_point' => 10,
        'battery' => 11,
        'virtual_partner_pace' => 12,
        'hr_high_alert' => 13,
        'hr_low_alert' => 14,
        'speed_high_alert' => 15,
        'speed_low_alert' => 16,
        'cad_high_alert' => 17,
        'cad_low_alert' => 18,
        'power_high_alert' => 19,
        'power_low_alert' => 20,
        'recovery_hr' => 21,
        'battery_low' => 22,
        'time_duration_alert' => 23,
        'distance_duration_alert' => 24,
        'calorie_duration_alert' => 25,
        'activity' => 26,
        'fitness_equipment' => 27,
        'length' => 28,
        'user_marker' => 32,
        'sport_point' => 33,
        'calibration' => 36,
        'front_gear_change' => 42,
        'rear_gear_change' => 43,
        'rider_position_change' => 44,
        'elev_high_alert' => 45,
        'elev_low_alert' => 46,
        'comm_timeout' => 47,
        'auto_activity_detect' => 54, # marker
        'dive_alert' => 56, # marker
        'dive_gas_switched' => 57, # marker
        'tank_pressure_reserve' => 71, # marker
        'tank_pressure_critical' => 72, # marker
        'tank_lost' => 73, # marker
        'radar_threat_alert' => 75, # start/stop/marker
        'tank_battery_low' => 76, # marker
        'tank_pod_connected' => 81, # marker - tank pod has connected
        'tank_pod_disconnected' => 82, # marker - tank pod has lost connection
    },

    'event_type' => +{
        '_base_type' => FIT_ENUM,
        'start' => 0,
        'stop' => 1,
        'consecutive_depreciated' => 2,
        'marker' => 3,
        'stop_all' => 4,
        'begin_depreciated' => 5,
        'end_depreciated' => 6,
        'end_all_depreciated' => 7,
        'stop_disable' => 8,
        'stop_disable_all' => 9,
    },

    'timer_trigger' => +{
        '_base_type' => FIT_ENUM,
        'manual' => 0,
        'auto' => 1,
        'fitness_equipment' => 2,
    },

    'fitness_equipment_state' => +{
        '_base_type' => FIT_ENUM,
        'ready' => 0,
        'in_use' => 1,
        'paused' => 2,
        'unknown' => 3,
    },

    'tone' => +{
        '_base_type' => FIT_ENUM,
        'off' => 0,
        'tone' => 1,
        'vibrate' => 2,
        'tone_and_vibrate' => 3,
    },
    'autoscroll' => +{
        '_base_type' => FIT_ENUM,
        'none' => 0,
        'slow' => 1,
        'medium' => 2,
        'fast' => 3,
    },

    'activity_class' => +{
        '_base_type' => FIT_ENUM,
        '_mask' => 1,
        'level' => 0x7f,
        'level_max' => 100,
        'athlete' => 0x80,
    },

    'hr_zone_calc' => +{
        '_base_type' => FIT_ENUM,
        'custom' => 0,
        'percent_max_hr' => 1,
        'percent_hrr' => 2,
        'percent_lthr' => 3,
    },

    'pwr_zone_calc' => +{
        '_base_type' => FIT_ENUM,
        'custom' => 0,
        'percent_ftp' => 1,
    },

    'wkt_step_duration' => +{
        '_base_type' => FIT_ENUM,
        'time' => 0,
        'distance' => 1,
        'hr_less_than' => 2,
        'hr_greater_than' => 3,
        'calories' => 4,
        'open' => 5,
        'repeat_until_steps_cmplt' => 6,
        'repeat_until_time' => 7,
        'repeat_until_distance' => 8,
        'repeat_until_calories' => 9,
        'repeat_until_hr_less_than' => 10,
        'repeat_until_hr_greater_than' => 11,
        'repeat_until_power_less_than' => 12,
        'repeat_until_power_greater_than' => 13,
        'power_less_than' => 14,
        'power_greater_than' => 15,
        'training_peaks_tss' => 16,
        'repeat_until_power_last_lap_less_than' => 17,
        'repeat_until_max_power_last_lap_less_than' => 18,
        'power_3s_less_than' => 19,
        'power_10s_less_than' => 20,
        'power_30s_less_than' => 21,
        'power_3s_greater_than' => 22,
        'power_10s_greater_than' => 23,
        'power_30s_greater_than' => 24,
        'power_lap_less_than' => 25,
        'power_lap_greater_than' => 26,
        'repeat_until_training_peaks_tss' => 27,
        'repetition_time' => 28,
        'reps' => 29,
        'time_only' => 31,
    },

    'wkt_step_target' => +{
        '_base_type' => FIT_ENUM,
        'speed' => 0,
        'heart_rate' => 1,
        'open' => 2,
        'cadence' => 3,
        'power' => 4,
        'grade' => 5,
        'resistance' => 6,
        'power_3s' => 7,
        'power_10s' => 8,
        'power_30s' => 9,
        'power_lap' => 10,
        'swim_stroke' => 11,
        'speed_lap' => 12,
        'heart_rate_lap' => 13,
    },

    'goal' => +{
        '_base_type' => FIT_ENUM,
        'time' => 0,
        'distance' => 1,
        'calories' => 2,
        'frequency' => 3,
        'steps' => 4,
        'ascent' => 5,
        'active_minutes' => 6,
    },

    'goal_recurrence' => +{
        '_base_type' => FIT_ENUM,
        'off' => 0,
        'daily' => 1,
        'weekly' => 2,
        'monthly' => 3,
        'yearly' => 4,
        'custom' => 5,
    },

    'goal_source' => +{
        '_base_type' => FIT_ENUM,
        'auto' => 0,
        'community' => 1,
        'user' => 2,
    },

    'schedule' => +{
        '_base_type' => FIT_ENUM,
        'workout' => 0,
        'course' => 1,
    },

    'course_point' => +{
        '_base_type' => FIT_ENUM,
        'generic' => 0,
        'summit' => 1,
        'valley' => 2,
        'water' => 3,
        'food' => 4,
        'danger' => 5,
        'left' => 6,
        'right' => 7,
        'straight' => 8,
        'first_aid' => 9,
        'fourth_category' => 10,
        'third_category' => 11,
        'second_category' => 12,
        'first_category' => 13,
        'hors_category' => 14,
        'sprint' => 15,
        'left_fork' => 16,
        'right_fork' => 17,
        'middle_fork' => 18,
        'slight_left' => 19,
        'sharp_left' => 20,
        'slight_right' => 21,
        'sharp_right' => 22,
        'u_turn' => 23,
        'segment_start' => 24,
        'segment_end' => 25,
    },

    'manufacturer' => +{
        '_base_type' => FIT_UINT16,
        'garmin' => 1,
        'garmin_fr405_antfs' => 2,
        'zephyr' => 3,
        'dayton' => 4,
        'idt' => 5,
        'srm' => 6,
        'quarq' => 7,
        'ibike' => 8,
        'saris' => 9,
        'spark_hk' => 10,
        'tanita' => 11,
        'echowell' => 12,
        'dynastream_oem' => 13,
        'nautilus' => 14,
        'dynastream' => 15,
        'timex' => 16,
        'metrigear' => 17,
        'xelic' => 18,
        'beurer' => 19,
        'cardiosport' => 20,
        'a_and_d' => 21,
        'hmm' => 22,
        'suunto' => 23,
        'thita_elektronik' => 24,
        'gpulse' => 25,
        'clean_mobile' => 26,
        'pedal_brain' => 27,
        'peaksware' => 28,
        'saxonar' => 29,
        'lemond_fitness' => 30,
        'dexcom' => 31,
        'wahoo_fitness' => 32,
        'octane_fitness' => 33,
        'archinoetics' => 34,
        'the_hurt_box' => 35,
        'citizen_systems' => 36,
        'magellan' => 37,
        'osynce' => 38,
        'holux' => 39,
        'concept2' => 40,
        'one_giant_leap' => 42,
        'ace_sensor' => 43,
        'brim_brothers' => 44,
        'xplova' => 45,
        'perception_digital' => 46,
        'bf1systems' => 47,
        'pioneer' => 48,
        'spantec' => 49,
        'metalogics' => 50,
        '4iiiis' => 51,
        'seiko_epson' => 52,
        'seiko_epson_oem' => 53,
        'ifor_powell' => 54,
        'maxwell_guider' => 55,
        'star_trac' => 56,
        'breakaway' => 57,
        'alatech_technology_ltd' => 58,
        'mio_technology_europe' => 59,
        'rotor' => 60,
        'geonaute' => 61,
        'id_bike' => 62,
        'specialized' => 63,
        'wtek' => 64,
        'physical_enterprises' => 65,
        'north_pole_engineering' => 66,
        'bkool' => 67,
        'cateye' => 68,
        'stages_cycling' => 69,
        'sigmasport' => 70,
        'tomtom' => 71,
        'peripedal' => 72,
        'wattbike' => 73,
        'moxy' => 76,
        'ciclosport' => 77,
        'powerbahn' => 78,
        'acorn_projects_aps' => 79,
        'lifebeam' => 80,
        'bontrager' => 81,
        'wellgo' => 82,
        'scosche' => 83,
        'magura' => 84,
        'woodway' => 85,
        'elite' => 86,
        'nielsen_kellerman' => 87,
        'dk_city' => 88,
        'tacx' => 89,
        'direction_technology' => 90,
        'magtonic' => 91,
        '1partcarbon' => 92,
        'inside_ride_technologies' => 93,
        'sound_of_motion' => 94,
        'stryd' => 95,
        'icg' => 96,
        'mipulse' => 97,
        'bsx_athletics' => 98,
        'look' => 99,
        'campagnolo_srl' => 100,
        'body_bike_smart' => 101,
        'praxisworks' => 102,
        'limits_technology' => 103,
        'topaction_technology' => 104,
        'cosinuss' => 105,
        'fitcare' => 106,
        'magene' => 107,
        'giant_manufacturing_co' => 108,
        'tigrasport' => 109,
        'salutron' => 110,
        'technogym' => 111,
        'bryton_sensors' => 112,
        'latitude_limited' => 113,
        'soaring_technology' => 114,
        'igpsport' => 115,
        'thinkrider' => 116,
        'gopher_sport' => 117,
        'waterrower' => 118,
        'orangetheory' => 119,
        'inpeak' => 120,
        'kinetic' => 121,
        'johnson_health_tech' => 122,
        'polar_electro' => 123,
        'seesense' => 124,
        'nci_technology' => 125,
        'iqsquare' => 126,
        'leomo' => 127,
        'ifit_com' => 128,
        'coros_byte' => 129,
        'versa_design' => 130,
        'chileaf' => 131,
        'cycplus' => 132,
        'gravaa_byte' => 133,
        'sigeyi' => 134,
        'coospo' => 135,
        'geoid' => 136,
        'bosch' => 137,
        'kyto' => 138,
        'kinetic_sports' => 139,
        'decathlon_byte' => 140,
        'tq_systems' => 141,
        'tag_heuer' => 142,
        'keiser_fitness' => 143,
        'zwift_byte' => 144,
        'porsche_ep' => 145,
        'blackbird' => 146,
        'meilan_byte' => 147,
        'ezon' => 148,
        'laisi' => 149,
        'myzone' => 150,
        'development' => 255,
        'healthandlife' => 257,
        'lezyne' => 258,
        'scribe_labs' => 259,
        'zwift' => 260,
        'watteam' => 261,
        'recon' => 262,
        'favero_electronics' => 263,
        'dynovelo' => 264,
        'strava' => 265,
        'precor' => 266,
        'bryton' => 267,
        'sram' => 268,
        'navman' => 269,
        'cobi' => 270,
        'spivi' => 271,
        'mio_magellan' => 272,
        'evesports' => 273,
        'sensitivus_gauge' => 274,
        'podoon' => 275,
        'life_time_fitness' => 276,
        'falco_e_motors' => 277,
        'minoura' => 278,
        'cycliq' => 279,
        'luxottica' => 280,
        'trainer_road' => 281,
        'the_sufferfest' => 282,
        'fullspeedahead' => 283,
        'virtualtraining' => 284,
        'feedbacksports' => 285,
        'omata' => 286,
        'vdo' => 287,
        'magneticdays' => 288,
        'hammerhead' => 289,
        'kinetic_by_kurt' => 290,
        'shapelog' => 291,
        'dabuziduo' => 292,
        'jetblack' => 293,
        'coros' => 294,
        'virtugo' => 295,
        'velosense' => 296,
        'cycligentinc' => 297,
        'trailforks' => 298,
        'mahle_ebikemotion' => 299,
        'nurvv' => 300,
        'microprogram' => 301,
        'zone5cloud' => 302,
        'greenteg' => 303,
        'yamaha_motors' => 304,
        'whoop' => 305,
        'gravaa' => 306,
        'onelap' => 307,
        'monark_exercise' => 308,
        'form' => 309,
        'decathlon' => 310,
        'syncros' => 311,
        'heatup' => 312,
        'cannondale' => 313,
        'true_fitness' => 314,
        'RGT_cycling' => 315,
        'vasa' => 316,
        'race_republic' => 317,
        'fazua' => 318,
        'oreka_training' => 319,
        'lsec' => 320, # Lishun Electric & Communication
        'lululemon_studio' => 321,
        'shanyue' => 322,
        'spinning_mda' => 323,
        'hilldating' => 324,
        'aero_sensor' => 325,
        'nike' => 326,
        'magicshine' => 327,
        'ictrainer' => 328,
        'absolute_cycling' => 329,
        'actigraphcorp' => 5759,
    },

    'garmin_product' => +{
        '_base_type' => FIT_UINT16,
        'hrm1' => 1,
        'axh01' => 2, # AXH01 HRM chipset
        'axb01' => 3,
        'axb02' => 4,
        'hrm2ss' => 5,
        'dsi_alf02' => 6,
        'hrm3ss' => 7,
        'hrm_run_single_byte_product_id' => 8, # hrm_run model for HRM ANT+ messaging
        'bsm' => 9, # BSM model for ANT+ messaging
        'bcm' => 10, # BCM model for ANT+ messaging
        'axs01' => 11, # AXS01 HRM Bike Chipset model for ANT+ messaging
        'hrm_tri_single_byte_product_id' => 12, # hrm_tri model for HRM ANT+ messaging
        'hrm4_run_single_byte_product_id' => 13, # hrm4 run model for HRM ANT+ messaging
        'fr225_single_byte_product_id' => 14, # fr225 model for HRM ANT+ messaging
        'gen3_bsm_single_byte_product_id' => 15, # gen3_bsm model for Bike Speed ANT+ messaging
        'gen3_bcm_single_byte_product_id' => 16, # gen3_bcm model for Bike Cadence ANT+ messaging
        'hrm_fit_single_byte_product_id' => 22,
        'OHR' => 255, # Garmin Wearable Optical Heart Rate Sensor for ANT+ HR Profile Broadcasting
        'fr301_china' => 473,
        'fr301_japan' => 474,
        'fr301_korea' => 475,
        'fr301_taiwan' => 494,
        'fr405' => 717, # Forerunner 405
        'fr50' => 782, # Forerunner 50
        'fr405_japan' => 987,
        'fr60' => 988, # Forerunner 60
        'dsi_alf01' => 1011,
        'fr310xt' => 1018, # Forerunner 310
        'edge500' => 1036,
        'fr110' => 1124, # Forerunner 110
        'edge800' => 1169,
        'edge500_taiwan' => 1199,
        'edge500_japan' => 1213,
        'chirp' => 1253,
        'fr110_japan' => 1274,
        'edge200' => 1325,
        'fr910xt' => 1328,
        'edge800_taiwan' => 1333,
        'edge800_japan' => 1334,
        'alf04' => 1341,
        'fr610' => 1345,
        'fr210_japan' => 1360,
        'vector_ss' => 1380,
        'vector_cp' => 1381,
        'edge800_china' => 1386,
        'edge500_china' => 1387,
        'approach_g10' => 1405,
        'fr610_japan' => 1410,
        'edge500_korea' => 1422,
        'fr70' => 1436,
        'fr310xt_4t' => 1446,
        'amx' => 1461,
        'fr10' => 1482,
        'edge800_korea' => 1497,
        'swim' => 1499,
        'fr910xt_china' => 1537,
        'fenix' => 1551,
        'edge200_taiwan' => 1555,
        'edge510' => 1561,
        'edge810' => 1567,
        'tempe' => 1570,
        'fr910xt_japan' => 1600,
        'fr620' => 1623,
        'fr220' => 1632,
        'fr910xt_korea' => 1664,
        'fr10_japan' => 1688,
        'edge810_japan' => 1721,
        'virb_elite' => 1735,
        'edge_touring' => 1736, # Also Edge Touring Plus
        'edge510_japan' => 1742,
        'hrm_tri' => 1743, # Also HRM-Swim
        'hrm_run' => 1752,
        'fr920xt' => 1765,
        'edge510_asia' => 1821,
        'edge810_china' => 1822,
        'edge810_taiwan' => 1823,
        'edge1000' => 1836,
        'vivo_fit' => 1837,
        'virb_remote' => 1853,
        'vivo_ki' => 1885,
        'fr15' => 1903,
        'vivo_active' => 1907,
        'edge510_korea' => 1918,
        'fr620_japan' => 1928,
        'fr620_china' => 1929,
        'fr220_japan' => 1930,
        'fr220_china' => 1931,
        'approach_s6' => 1936,
        'vivo_smart' => 1956,
        'fenix2' => 1967,
        'epix' => 1988,
        'fenix3' => 2050,
        'edge1000_taiwan' => 2052,
        'edge1000_japan' => 2053,
        'fr15_japan' => 2061,
        'edge520' => 2067,
        'edge1000_china' => 2070,
        'fr620_russia' => 2072,
        'fr220_russia' => 2073,
        'vector_s' => 2079,
        'edge1000_korea' => 2100,
        'fr920xt_taiwan' => 2130,
        'fr920xt_china' => 2131,
        'fr920xt_japan' => 2132,
        'virbx' => 2134,
        'vivo_smart_apac' => 2135,
        'etrex_touch' => 2140,
        'edge25' => 2147,
        'fr25' => 2148,
        'vivo_fit2' => 2150,
        'fr225' => 2153,
        'fr630' => 2156,
        'fr230' => 2157,
        'fr735xt' => 2158,
        'vivo_active_apac' => 2160,
        'vector_2' => 2161,
        'vector_2s' => 2162,
        'virbxe' => 2172,
        'fr620_taiwan' => 2173,
        'fr220_taiwan' => 2174,
        'truswing' => 2175,
        'd2airvenu' => 2187,
        'fenix3_china' => 2188,
        'fenix3_twn' => 2189,
        'varia_headlight' => 2192,
        'varia_taillight_old' => 2193,
        'edge_explore_1000' => 2204,
        'fr225_asia' => 2219,
        'varia_radar_taillight' => 2225,
        'varia_radar_display' => 2226,
        'edge20' => 2238,
        'edge520_asia' => 2260,
        'edge520_japan' => 2261,
        'd2_bravo' => 2262,
        'approach_s20' => 2266,
        'vivo_smart2' => 2271,
        'edge1000_thai' => 2274,
        'varia_remote' => 2276,
        'edge25_asia' => 2288,
        'edge25_jpn' => 2289,
        'edge20_asia' => 2290,
        'approach_x40' => 2292,
        'fenix3_japan' => 2293,
        'vivo_smart_emea' => 2294,
        'fr630_asia' => 2310,
        'fr630_jpn' => 2311,
        'fr230_jpn' => 2313,
        'hrm4_run' => 2327,
        'epix_japan' => 2332,
        'vivo_active_hr' => 2337,
        'vivo_smart_gps_hr' => 2347,
        'vivo_smart_hr' => 2348,
        'vivo_smart_hr_asia' => 2361,
        'vivo_smart_gps_hr_asia' => 2362,
        'vivo_move' => 2368,
        'varia_taillight' => 2379,
        'fr235_asia' => 2396,
        'fr235_japan' => 2397,
        'varia_vision' => 2398,
        'vivo_fit3' => 2406,
        'fenix3_korea' => 2407,
        'fenix3_sea' => 2408,
        'fenix3_hr' => 2413,
        'virb_ultra_30' => 2417,
        'index_smart_scale' => 2429,
        'fr235' => 2431,
        'fenix3_chronos' => 2432,
        'oregon7xx' => 2441,
        'rino7xx' => 2444,
        'epix_korea' => 2457,
        'fenix3_hr_chn' => 2473,
        'fenix3_hr_twn' => 2474,
        'fenix3_hr_jpn' => 2475,
        'fenix3_hr_sea' => 2476,
        'fenix3_hr_kor' => 2477,
        'nautix' => 2496,
        'vivo_active_hr_apac' => 2497,
        'fr35' => 2503,
        'oregon7xx_ww' => 2512,
        'edge_820' => 2530,
        'edge_explore_820' => 2531,
        'fr735xt_apac' => 2533,
        'fr735xt_japan' => 2534,
        'fenix5s' => 2544,
        'd2_bravo_titanium' => 2547,
        'varia_ut800' => 2567, # Varia UT 800 SW
        'running_dynamics_pod' => 2593,
        'edge_820_china' => 2599,
        'edge_820_japan' => 2600,
        'fenix5x' => 2604,
        'vivo_fit_jr' => 2606,
        'vivo_smart3' => 2622,
        'vivo_sport' => 2623,
        'edge_820_taiwan' => 2628,
        'edge_820_korea' => 2629,
        'edge_820_sea' => 2630,
        'fr35_hebrew' => 2650,
        'approach_s60' => 2656,
        'fr35_apac' => 2667,
        'fr35_japan' => 2668,
        'fenix3_chronos_asia' => 2675,
        'virb_360' => 2687,
        'fr935' => 2691,
        'fenix5' => 2697,
        'vivoactive3' => 2700,
        'fr235_china_nfc' => 2733,
        'foretrex_601_701' => 2769,
        'vivo_move_hr' => 2772,
        'edge_1030' => 2713,
        'fr35_sea' => 2727,
        'vector_3' => 2787,
        'fenix5_asia' => 2796,
        'fenix5s_asia' => 2797,
        'fenix5x_asia' => 2798,
        'approach_z80' => 2806,
        'fr35_korea' => 2814,
        'd2charlie' => 2819,
        'vivo_smart3_apac' => 2831,
        'vivo_sport_apac' => 2832,
        'fr935_asia' => 2833,
        'descent' => 2859,
        'vivo_fit4' => 2878,
        'fr645' => 2886,
        'fr645m' => 2888,
        'fr30' => 2891,
        'fenix5s_plus' => 2900,
        'Edge_130' => 2909,
        'edge_1030_asia' => 2924,
        'vivosmart_4' => 2927,
        'vivo_move_hr_asia' => 2945,
        'approach_x10' => 2962,
        'fr30_asia' => 2977,
        'vivoactive3m_w' => 2988,
        'fr645_asia' => 3003,
        'fr645m_asia' => 3004,
        'edge_explore' => 3011,
        'gpsmap66' => 3028,
        'approach_s10' => 3049,
        'vivoactive3m_l' => 3066,
        'approach_g80' => 3085,
        'edge_130_asia' => 3092,
        'edge_1030_bontrager' => 3095,
        'fenix5_plus' => 3110,
        'fenix5x_plus' => 3111,
        'edge_520_plus' => 3112,
        'fr945' => 3113,
        'edge_530' => 3121,
        'edge_830' => 3122,
        'instinct_esports' => 3126,
        'fenix5s_plus_apac' => 3134,
        'fenix5x_plus_apac' => 3135,
        'edge_520_plus_apac' => 3142,
        'descent_t1' => 3143,
        'fr235l_asia' => 3144,
        'fr245_asia' => 3145,
        'vivo_active3m_apac' => 3163,
        'gen3_bsm' => 3192, # gen3 bike speed sensor
        'gen3_bcm' => 3193, # gen3 bike cadence sensor
        'vivo_smart4_asia' => 3218,
        'vivoactive4_small' => 3224,
        'vivoactive4_large' => 3225,
        'venu' => 3226,
        'marq_driver' => 3246,
        'marq_aviator' => 3247,
        'marq_captain' => 3248,
        'marq_commander' => 3249,
        'marq_expedition' => 3250,
        'marq_athlete' => 3251,
        'descent_mk2' => 3258,
        'gpsmap66i' => 3284,
        'fenix6S_sport' => 3287,
        'fenix6S' => 3288,
        'fenix6_sport' => 3289,
        'fenix6' => 3290,
        'fenix6x' => 3291,
        'hrm_dual' => 3299, # HRM-Dual
        'hrm_pro' => 3300, # HRM-Pro
        'vivo_move3_premium' => 3308,
        'approach_s40' => 3314,
        'fr245m_asia' => 3321,
        'edge_530_apac' => 3349,
        'edge_830_apac' => 3350,
        'vivo_move3' => 3378,
        'vivo_active4_small_asia' => 3387,
        'vivo_active4_large_asia' => 3388,
        'vivo_active4_oled_asia' => 3389,
        'swim2' => 3405,
        'marq_driver_asia' => 3420,
        'marq_aviator_asia' => 3421,
        'vivo_move3_asia' => 3422,
        'fr945_asia' => 3441,
        'vivo_active3t_chn' => 3446,
        'marq_captain_asia' => 3448,
        'marq_commander_asia' => 3449,
        'marq_expedition_asia' => 3450,
        'marq_athlete_asia' => 3451,
        'instinct_solar' => 3466,
        'fr45_asia' => 3469,
        'vivoactive3_daimler' => 3473,
        'legacy_rey' => 3498,
        'legacy_darth_vader' => 3499,
        'legacy_captain_marvel' => 3500,
        'legacy_first_avenger' => 3501,
        'fenix6s_sport_asia' => 3512,
        'fenix6s_asia' => 3513,
        'fenix6_sport_asia' => 3514,
        'fenix6_asia' => 3515,
        'fenix6x_asia' => 3516,
        'legacy_captain_marvel_asia' => 3535,
        'legacy_first_avenger_asia' => 3536,
        'legacy_rey_asia' => 3537,
        'legacy_darth_vader_asia' => 3538,
        'descent_mk2s' => 3542,
        'edge_130_plus' => 3558,
        'edge_1030_plus' => 3570,
        'rally_200' => 3578, # Rally 100/200 Power Meter Series
        'fr745' => 3589,
        'venusq' => 3600,
        'lily' => 3615,
        'marq_adventurer' => 3624,
        'enduro' => 3638,
        'swim2_apac' => 3639,
        'marq_adventurer_asia' => 3648,
        'fr945_lte' => 3652,
        'descent_mk2_asia' => 3702, # Mk2 and Mk2i
        'venu2' => 3703,
        'venu2s' => 3704,
        'venu_daimler_asia' => 3737,
        'marq_golfer' => 3739,
        'venu_daimler' => 3740,
        'fr745_asia' => 3794,
        'varia_rct715' => 3808,
        'lily_asia' => 3809,
        'edge_1030_plus_asia' => 3812,
        'edge_130_plus_asia' => 3813,
        'approach_s12' => 3823,
        'enduro_asia' => 3872,
        'venusq_asia' => 3837,
        'edge_1040' => 3843,
        'marq_golfer_asia' => 3850,
        'venu2_plus' => 3851,
        'gnss' => 3865,
        'fr55' => 3869,
        'instinct_2' => 3888,
        'fenix7s' => 3905,
        'fenix7' => 3906,
        'fenix7x' => 3907,
        'fenix7s_apac' => 3908,
        'fenix7_apac' => 3909,
        'fenix7x_apac' => 3910,
        'approach_g12' => 3927,
        'descent_mk2s_asia' => 3930,
        'approach_s42' => 3934,
        'epix_gen2' => 3943,
        'epix_gen2_apac' => 3944,
        'venu2s_asia' => 3949,
        'venu2_asia' => 3950,
        'fr945_lte_asia' => 3978,
        'vivo_move_sport' => 3982,
        'vivomove_trend' => 3983,
        'approach_S12_asia' => 3986,
        'fr255_music' => 3990,
        'fr255_small_music' => 3991,
        'fr255' => 3992,
        'fr255_small' => 3993,
        'approach_g12_asia' => 4001,
        'approach_s42_asia' => 4002,
        'descent_g1' => 4005,
        'venu2_plus_asia' => 4017,
        'fr955' => 4024,
        'fr55_asia' => 4033,
        'edge_540' => 4061,
        'edge_840' => 4062,
        'vivosmart_5' => 4063,
        'instinct_2_asia' => 4071,
        'marq_gen2' => 4105, # Adventurer, Athlete, Captain, Golfer
        'venusq2' => 4115,
        'venusq2music' => 4116,
        'marq_gen2_aviator' => 4124,
        'd2_air_x10' => 4125,
        'hrm_pro_plus' => 4130,
        'descent_g1_asia' => 4132,
        'tactix7' => 4135,
        'instinct_crossover' => 4155,
        'edge_explore2' => 4169,
        'descent_mk3' => 4222,
        'descent_mk3i' => 4223,
        'approach_s70' => 4233,
        'fr265_large' => 4257,
        'fr265_small' => 4258,
        'venu3' => 4260,
        'venu3s' => 4261,
        'tacx_neo_smart' => 4265, # Neo Smart, Tacx
        'tacx_neo2_smart' => 4266, # Neo 2 Smart, Tacx
        'tacx_neo2_t_smart' => 4267, # Neo 2T Smart, Tacx
        'tacx_neo_smart_bike' => 4268, # Neo Smart Bike, Tacx
        'tacx_satori_smart' => 4269, # Satori Smart, Tacx
        'tacx_flow_smart' => 4270, # Flow Smart, Tacx
        'tacx_vortex_smart' => 4271, # Vortex Smart, Tacx
        'tacx_bushido_smart' => 4272, # Bushido Smart, Tacx
        'tacx_genius_smart' => 4273, # Genius Smart, Tacx
        'tacx_flux_flux_s_smart' => 4274, # Flux/Flux S Smart, Tacx
        'tacx_flux2_smart' => 4275, # Flux 2 Smart, Tacx
        'tacx_magnum' => 4276, # Magnum, Tacx
        'edge_1040_asia' => 4305,
        'epix_gen2_pro_42' => 4312,
        'epix_gen2_pro_47' => 4313,
        'epix_gen2_pro_51' => 4314,
        'fr965' => 4315,
        'enduro2' => 4341,
        'fenix7s_pro_solar' => 4374,
        'fenix7_pro_solar' => 4375,
        'fenix7x_pro_solar' => 4376,
        'lily2' => 4380,
        'instinct_2x' => 4394,
        'vivoactive5' => 4426,
        'fr165' => 4432,
        'fr165_music' => 4433,
        'descent_t2' => 4442,
        'hrm_fit' => 4446,
        'marq_gen2_commander' => 4472,
        'd2_mach1_pro' => 4556,
        'sdm4' => 10007, # SDM4 footpod
        'edge_remote' => 10014,
        'tacx_training_app_win' => 20533,
        'tacx_training_app_mac' => 20534,
        'tacx_training_app_mac_catalyst' => 20565,
        'training_center' => 20119,
        'tacx_training_app_android' => 30045,
        'tacx_training_app_ios' => 30046,
        'tacx_training_app_legacy' => 30047,
        'connectiq_simulator' => 65531,
        'android_antplus_plugin' => 65532,
        'connect' => 65534, # Garmin Connect website
    },

    'device_type' => +{
        '_moved_to' => 'antplus_device_type',
    },

    'antplus_device_type' => +{
        '_base_type' => FIT_UINT8,
        'antfs' => 1,
        'bike_power' => 11,
        'environment_sensor_legacy' => 12,
        'multi_sport_speed_distance' => 15,
        'control' => 16,
        'fitness_equipment' => 17,
        'blood_pressure' => 18,
        'geocache_node' => 19,
        'light_electric_vehicle' => 20,
        'env_sensor' => 25,
        'racquet' => 26,
        'control_hub' => 27,
        'muscle_oxygen' => 31,
        'shifting' => 34,
        'bike_light_main' => 35,
        'bike_light_shared' => 36,
        'exd' => 38,
        'bike_radar' => 40,
        'bike_aero' => 46,
        'weight_scale' => 119,
        'heart_rate' => 120,
        'bike_speed_cadence' => 121,
        'bike_cadence' => 122,
        'bike_speed' => 123,
        'stride_speed_distance' => 124,
    },

    'ant_network' => +{
        '_base_type' => FIT_ENUM,
        'public' => 0,
        'antplus' => 1,
        'antfs' => 2,
        'private' => 3,
    },

    'workout_capabilities' => +{
        '_base_type' => FIT_UINT32Z,
        '_mask' => 1,
        'interval' => 0x00000001,
        'custom' => 0x00000002,
        'fitness_equipment' => 0x00000004,
        'firstbeat' => 0x00000008,
        'new_leaf' => 0x00000010,
        'tcx' => 0x00000020,
        'speed' => 0x00000080,
        'heart_rate' => 0x00000100,
        'distance' => 0x00000200,
        'cadence' => 0x00000400,
        'power' => 0x00000800,
        'grade' => 0x00001000,
        'resistance' => 0x00002000,
        'protected' => 0x00004000,
    },

    'battery_status' => +{
        '_base_type' => FIT_UINT8,
        'new' => 1,
        'good' => 2,
        'ok' => 3,
        'low' => 4,
        'critical' => 5,
        'charging' => 6,
        'unknown' => 7,
    },

    'hr_type' => +{
        '_base_type' => FIT_ENUM,
        'normal' => 0,
        'irregular' => 1,
    },

    'course_capabilities' => +{
        '_base_type' => FIT_UINT32Z,
        '_mask' => 1,
        'processed' => 0x00000001,
        'valid' => 0x00000002,
        'time' => 0x00000004,
        'distance' => 0x00000008,
        'position' => 0x00000010,
        'heart_rate' => 0x00000020,
        'power' => 0x00000040,
        'cadence' => 0x00000080,
        'training' => 0x00000100,
        'navigation' => 0x00000200,
        'bikeway' => 0x00000400,
        'aviation'=> 0x00001000,    # Denote course files to be used as flight plans
    },

    'weight' => +{
        '_base_type' => FIT_UINT16,
        'calculating' => 0xFFFE,
    },

    'workout_hr' => +{
        '_base_type' => FIT_UINT32,
        'bpm_offset' => 100,
    },

    'workout_power' => +{
        '_base_type' => FIT_UINT32,
        'watts_offset' => 1000,
    },

    'bp_status' => +{
        '_base_type' => FIT_ENUM,
        'no_error' => 0,
        'error_incomplete_data' => 1,
        'error_no_measurement' => 2,
        'error_data_out_of_range' => 3,
        'error_irregular_heart_rate' => 4,
    },

    'user_local_id' => +{
        '_base_type' => FIT_UINT16,
        'local_min' => 0x0001,
        'local_max' => 0x000F,
        'stationary_min' => 0x0010,
        'stationary_max' => 0x00FF,
        'portable_min' => 0x0100,
        'portable_max' => 0xFFFE,
    },

    'swim_stroke' => +{
        '_base_type' => FIT_ENUM,
        'freestyle' => 0,
        'backstroke' => 1,
        'breaststroke' => 2,
        'butterfly' => 3,
        'drill' => 4,
        'mixed' => 5,
        'im' => 6,
    },

    'activity_type' => +{
        '_base_type' => FIT_ENUM,
        'generic' => 0,
        'running' => 1,
        'cycling' => 2,
        'transition' => 3,
        'fitness_equipment' => 4,
        'swimming' => 5,
        'walking' => 6,
        'sedentary' => 8,
        'all' => 254,
    },

    'activity_subtype' => +{
        '_base_type' => FIT_ENUM,
        'generic' => 0,
        'treadmill' => 1, # run
        'street' => 2, # run
        'trail' => 3, # run
        'track' => 4, # run
        'spin' => 5, # cycling
        'indoor_cycling' => 6, # cycling
        'road' => 7, # cycling
        'mountain' => 8, # cycling
        'downhill' => 9, # cycling
        'recumbent' => 10, # cycling
        'cyclocross' => 11, # cycling
        'hand_cycling' => 12, # cycling
        'track_cycling' => 13, # cycling
        'indoor_rowing' => 14, # fitness equipment
        'elliptical' => 15, # fitness equipment
        'stair_climbing' => 16, # fitness equipment
        'lap_swimming' => 17, # swimming
        'open_water' => 18, # swimming
        'all' => 254,
    },

    'activity_level' => +{
        '_base_type' => FIT_ENUM,
        'low' => 0,
        'medium' => 1,
        'high' => 2,
    },

    'side' => +{
        '_base_type' => FIT_ENUM,
        'right' => 0,
        'left' => 1,
    },

    'left_right_balance' => +{
        '_base_type' => FIT_UINT8,
        'mask' => 0x7F,
        'right' => 0x80,
    },

    'left_right_balance_100' => +{
        '_base_type' => FIT_UINT16,
        'mask' => 0x3FFF,
        'right' => 0x8000,
    },

    'length_type' => +{
        '_base_type' => FIT_ENUM,
        'idle' => 0,
        'active' => 1,
    },

    'day_of_week' => +{
        '_base_type' => FIT_ENUM,
        'sunday' => 0,
        'monday' => 1,
        'tuesday' => 2,
        'wednesday' => 3,
        'thursday' => 4,
        'friday' => 5,
        'saturday' => 6,
    },

    'connectivity_capabilities' => +{
        '_base_type' => FIT_UINT32Z,
        'bluetooth' => 0x00000001,
        'bluetooth_le' => 0x00000002,
        'ant' => 0x00000004,
        'activity_upload' => 0x00000008,
        'course_download' => 0x00000010,
        'workout_download' => 0x00000020,
        'live_track' => 0x00000040,
        'weather_conditions' => 0x00000080,
        'weather_alerts' => 0x00000100,
        'gps_ephemeris_download' => 0x00000200,
        'explicit_archive' => 0x00000400,
        'setup_incomplete' => 0x00000800,
        'continue_sync_after_software_update' => 0x00001000,
        'connect_iq_app_download' => 0x00002000,
        'golf_course_download' => 0x00004000,
        'device_initiates_sync' => 0x00008000,
        'connect_iq_watch_app_download' => 0x00010000,
        'connect_iq_widget_download' => 0x00020000,
        'connect_iq_watch_face_download' => 0x00040000,
        'connect_iq_data_field_download' => 0x00080000,
        'connect_iq_app_managment' => 0x00100000,
        'swing_sensor' => 0x00200000,
        'swing_sensor_remote' => 0x00400000,
        'incident_detection' => 0x00800000,
        'audio_prompts' => 0x01000000,
        'wifi_verification' => 0x02000000,
        'true_up' => 0x04000000,
        'find_my_watch' => 0x08000000,
        'remote_manual_sync' => 0x10000000,
        'live_track_auto_start' => 0x20000000,
        'live_track_messaging' => 0x40000000,
        'instant_input' => 0x80000000, # Device supports instant input feature
    },

    'weather_report' => +{
        '_base_type' => FIT_ENUM,
        'current' => 0,
#    'forecast' => 1, # deprecated, use hourly_forecast instead
        'hourly_forecast' => 1,
        'daily_forecast' => 2,
    },

    'weather_status' => +{
        '_base_type' => FIT_ENUM,
        'clear' => 0,
        'partly_cloudy' => 1,
        'mostly_cloudy' => 2,
        'rain' => 3,
        'snow' => 4,
        'windy' => 5,
        'thunderstorms' => 6,
        'wintry_mix' => 7,
        'fog' => 8,
        'hazy' => 11,
        'hail' => 12,
        'scattered_showers' => 13,
        'scattered_thunderstorms' => 14,
        'unknown_precipitation' => 15,
        'light_rain' => 16,
        'heavy_rain' => 17,
        'light_snow' => 18,
        'heavy_snow' => 19,
        'light_rain_snow' => 20,
        'heavy_rain_snow' => 21,
        'cloudy' => 22,
    },

    'weather_severity' => +{
        '_base_type' => FIT_ENUM,
        'unknown' => 0,
        'warning' => 1,
        'watch' => 2,
        'advisory' => 3,
        'statement' => 4,
    },

    'weather_severe_type' => +{
        '_base_type' => FIT_ENUM,
        'unspecified' => 0,
        'tornado' => 1,
        'tsunami' => 2,
        'hurricane' => 3,
        'extreme_wind' => 4,
        'typhoon' => 5,
        'inland_hurricane' => 6,
        'hurricane_force_wind' => 7,
        'waterspout' => 8,
        'severe_thunderstorm' => 9,
        'wreckhouse_winds' => 10,
        'les_suetes_wind' => 11,
        'avalanche' => 12,
        'flash_flood' => 13,
        'tropical_storm' => 14,
        'inland_tropical_storm' => 15,
        'blizzard' => 16,
        'ice_storm' => 17,
        'freezing_rain' => 18,
        'debris_flow' => 19,
        'flash_freeze' => 20,
        'dust_storm' => 21,
        'high_wind' => 22,
        'winter_storm' => 23,
        'heavy_freezing_spray' => 24,
        'extreme_cold' => 25,
        'wind_chill' => 26,
        'cold_wave' => 27,
        'heavy_snow_alert' => 28,
        'lake_effect_blowing_snow' => 29,
        'snow_squall' => 30,
        'lake_effect_snow' => 31,
        'winter_weather' => 32,
        'sleet' => 33,
        'snowfall' => 34,
        'snow_and_blowing_snow' => 35,
        'blowing_snow' => 36,
        'snow_alert' => 37,
        'arctic_outflow' => 38,
        'freezing_drizzle' => 39,
        'storm' => 40,
        'storm_surge' => 41,
        'rainfall' => 42,
        'areal_flood' => 43,
        'coastal_flood' => 44,
        'lakeshore_flood' => 45,
        'excessive_heat' => 46,
        'heat' => 47,
        'weather' => 48,
        'high_heat_and_humidity' => 49,
        'humidex_and_health' => 50,
        'humidex' => 51,
        'gale' => 52,
        'freezing_spray' => 53,
        'special_marine' => 54,
        'squall' => 55,
        'strong_wind' => 56,
        'lake_wind' => 57,
        'marine_weather' => 58,
        'wind' => 59,
        'small_craft_hazardous_seas' => 60,
        'hazardous_seas' => 61,
        'small_craft' => 62,
        'small_craft_winds' => 63,
        'small_craft_rough_bar' => 64,
        'high_water_level' => 65,
        'ashfall' => 66,
        'freezing_fog' => 67,
        'dense_fog' => 68,
        'dense_smoke' => 69,
        'blowing_dust' => 70,
        'hard_freeze' => 71,
        'freeze' => 72,
        'frost' => 73,
        'fire_weather' => 74,
        'flood' => 75,
        'rip_tide' => 76,
        'high_surf' => 77,
        'smog' => 78,
        'air_quality' => 79,
        'brisk_wind' => 80,
        'air_stagnation' => 81,
        'low_water' => 82,
        'hydrological' => 83,
        'special_weather' => 84,
    },

    'time_into_day' => +{ # since 00:00:00 UTC
        '_base_type' => FIT_UINT32,
    },

    'localtime_into_day' => +{ # same as above, but in local time zone
        '_base_type' => FIT_UINT32,
    },

    'stroke_type' => +{
        '_base_type' => FIT_ENUM,
        'no_event' => 0,
        'other' => 1,
        'serve' => 2,
        'forehand' => 3,
        'backhand' => 4,
        'smash' => 5,
    },

    'body_location' => +{
        '_base_type' => FIT_ENUM,
        'left_leg' => 0,
        'left_calf' => 1,
        'left_shin' => 2,
        'left_hamstring' => 3,
        'left_quad' => 4,
        'left_glute' => 5,
        'right_leg' => 6,
        'right_calf' => 7,
        'right_shin' => 8,
        'right_hamstring' => 9,
        'right_quad' => 10,
        'right_glute' => 11,
        'torso_back' => 12,
        'left_lower_back' => 13,
        'left_upper_back' => 14,
        'right_lower_back' => 15,
        'right_upper_back' => 16,
        'torso_front' => 17,
        'left_abdomen' => 18,
        'left_chest' => 19,
        'right_abdomen' => 20,
        'right_chest' => 21,
        'left_arm' => 22,
        'left_shoulder' => 23,
        'left_bicep' => 24,
        'left_tricep' => 25,
        'left_brachioradialis' => 26,
        'left_forearm_extensors' => 27,
        'right_arm' => 28,
        'right_shoulder' => 29,
        'right_bicep' => 30,
        'right_tricep' => 31,
        'right_brachioradialis' => 32,
        'right_forearm_extensors' => 33,
        'neck' => 34,
        'throat' => 35,
        'waist_mid_back' => 36,
        'waist_front' => 37,
        'waist_left' => 38,
        'waist_right' => 39,
    },

    'segment_lap_status' => +{
        '_base_type' => FIT_ENUM,
        'end' => 0,
        'fail' => 1,
    },

    'segment_leaderboard_type' => +{
        '_base_type' => FIT_ENUM,
        'overall' => 0,
        'personal_best' => 1,
        'connections' => 2,
        'group' => 3,
        'challenger' => 4,
        'kom' => 5,
        'qom' => 6,
        'pr' => 7,
        'goal' => 8,
        'carrot' => 9,
        'club_leader' => 10,
        'rival' => 11,
        'last' => 12,
        'recent_best' => 13,
        'course_record' => 14,
    },

    'segment_delete_status' => +{
        '_base_type' => FIT_ENUM,
        'do_not_delete' => 0,
        'delete_one' => 1,
        'delete_all' => 2,
    },

    'segment_selection_type' => +{
        '_base_type' => FIT_ENUM,
        'starred' => 0,
        'suggested' => 1,
    },

    'source_type' => +{
        '_base_type' => FIT_ENUM,
        'ant' => 0,
        'antplus' => 1,
        'bluetooth' => 2,
        'bluetooth_low_energy' => 3,
        'wifi' => 4,
        'local' => 5,
    },

    'local_device_type' => +{
        '_base_type' => FIT_UINT8,
        'gps' => 0,             # Onboard gps receiver
        'glonass' => 1,         # Onboard glonass receiver
        'gps_glonass' => 2,     # Onboard gps glonass receiver
        'accelerometer' => 3,   # Onboard sensor
        'barometer' => 4,       # Onboard sensor
        'temperature' => 5,     # Onboard sensor
        'whr' => 10,            # Onboard wrist HR sensor
        'sensor_hub' => 12,     # Onboard software package
    },

    'ble_device_type' => +{
        '_base_type' => FIT_ENUM,
        'connected_gps' => 0,   # GPS that is provided over a proprietary bluetooth service
        'heart_rate' => 1,
        'bike_power' => 2,
        'bike_speed_cadence' => 3,
        'bike_speed' => 4,
        'bike_cadence' => 5,
        'footpod' => 6,
        'bike_trainer' => 7,    # Indoor-Bike FTMS protocol
    },

    'ant_channel_id' => +{
        '_base_type' => FIT_UINT32Z,
        'ant_extended_device_number_upper_nibble' => 0xF0000000,
        'ant_transmission_type_lower_nibble' => 0x0F000000,
        'ant_device_type' => 0x00FF0000,
        'ant_device_number' => 0x0000FFFF,
    },

    'display_orientation' => +{
        '_base_type' => FIT_ENUM,
        'auto' => 0,
        'portrait' => 1,
        'landscape' => 2,
        'portrait_flipped' => 3,
        'landscape_flipped' => 4,
    },

    'workout_equipment' => +{
        '_base_type' => FIT_ENUM,
        'none' => 0,
        'swim_fins' => 1,
        'swim_kickboard' => 2,
        'swim_paddles' => 3,
        'swim_pull_buoy' => 4,
        'swim_snorkel' => 5,
    },
    'watchface_mode' => +{
        '_base_type' => FIT_ENUM,
        'digital' => 0,
        'analog' => 1,
        'connect_iq' => 2,
        'disabled' => 3,
    },

    'digital_watchface_layout' => +{
        '_base_type' => FIT_ENUM,
        'traditional' => 0,
        'modern' => 1,
        'bold' => 2,
    },

    'analog_watchface_layout' => +{
        '_base_type' => FIT_ENUM,
        'minimal' => 0,
        'traditional' => 1,
        'modern' => 2,
    },

    'rider_position_type' => +{
        '_base_type' => FIT_ENUM,
        'seated' => 0,
        'standing' => 1,
        'transition_to_seated' => 2,
        'transition_to_standing' => 3,
    },

    'power_phase_type' => +{
        '_base_type' => FIT_ENUM,
        'power_phase_start_angle' => 0,
        'power_phase_end_angle' => 1,
        'power_phase_arc_length' => 2,
        'power_phase_center' => 3,
    },

    'camera_event_type' => +{
        '_base_type' => FIT_ENUM,
        'video_start' => 0,
        'video_split' => 1,
        'video_end' => 2,
        'photo_taken' => 3,
        'video_second_stream_start' => 4,
        'video_second_stream_split' => 5,
        'video_second_stream_end' => 6,
        'video_split_start' => 7,
        'video_second_stream_split_start' => 8,
        'video_pause' => 11,
        'video_second_stream_pause' => 12,
        'video_resume' => 13,
        'video_second_stream_resume' => 14,
    },

    'sensor_type' => +{
        '_base_type' => FIT_ENUM,
        'accelerometer' => 0,
        'gyroscope' => 1,
        'compass' => 2, # Magnetometer
        'barometer' => 3,
    },

    'bike_light_network_config_type' => +{
        '_base_type' => FIT_ENUM,
        'auto' => 0,
        'individual' => 4,
        'high_visibility' => 5,
        'trail' => 6,
    },

    'comm_timeout_type' => +{
        '_base_type' => FIT_UINT16,
        'wildcard_pairing_timeout' => 0,
        'pairing_timeout' => 1,
        'connection_lost' => 2,
        'connection_timeout' => 3,
    },

    'camera_orientation_type' => +{
        '_base_type' => FIT_ENUM,
        'camera_orientation_0' => 0,
        'camera_orientation_90' => 1,
        'camera_orientation_180' => 2,
        'camera_orientation_270' => 3,
    },

    'attitude_stage' => +{
        '_base_type' => FIT_ENUM,
        'failed' => 0,
        'aligning' => 1,
        'degraded' => 2,
        'valid' => 3,
    },

    'attitude_validity' => +{
        '_base_type' => FIT_UINT16,
        'track_angle_heading_valid' => 0x0001,
        'pitch_valid' => 0x0002,
        'roll_valid' => 0x0004,
        'lateral_body_accel_valid' => 0x0008,
        'normal_body_accel_valid' => 0x0010,
        'turn_rate_valid' => 0x0020,
        'hw_fail' => 0x0040,
        'mag_invalid' => 0x0080,
        'no_gps' => 0x0100,
        'gps_invalid' => 0x0200,
        'solution_coasting' => 0x0400,
        'true_track_angle' => 0x0800,
        'magnetic_heading' => 0x1000,
    },

    'auto_sync_frequency' => +{
        '_base_type' => FIT_ENUM,
        'never' => 0,
        'occasionally' => 1,
        'frequent' => 2,
        'once_a_day' => 3,
        'remote' => 4,
    },

    'exd_layout' => +{
        '_base_type' => FIT_ENUM,
        'full_screen' => 0,
        'half_vertical' => 1,
        'half_horizontal' => 2,
        'half_vertical_right_split' => 3,
        'half_horizontal_bottom_split' => 4,
        'full_quarter_split' => 5,
        'half_vertical_left_split' => 6,
        'half_horizontal_top_split' => 7,
        'dynamic' => 8, # The EXD may display the configured concepts in any layout it sees fit.
    },

    'exd_display_type' => +{
        '_base_type' => FIT_ENUM,
        'numerical' => 0,
        'simple' => 1,
        'graph' => 2,
        'bar' => 3,
        'circle_graph' => 4,
        'virtual_partner' => 5,
        'balance' => 6,
        'string_list' => 7,
        'string' => 8,
        'simple_dynamic_icon' => 9,
        'gauge' => 10,
    },

    'exd_data_units' => +{
        '_base_type' => FIT_ENUM,
        'no_units' => 0,
        'laps' => 1,
        'miles_per_hour' => 2,
        'kilometers_per_hour' => 3,
        'feet_per_hour' => 4,
        'meters_per_hour' => 5,
        'degrees_celsius' => 6,
        'degrees_farenheit' => 7,
        'zone' => 8,
        'gear' => 9,
        'rpm' => 10,
        'bpm' => 11,
        'degrees' => 12,
        'millimeters' => 13,
        'meters' => 14,
        'kilometers' => 15,
        'feet' => 16,
        'yards' => 17,
        'kilofeet' => 18,
        'miles' => 19,
        'time' => 20,
        'enum_turn_type' => 21,
        'percent' => 22,
        'watts' => 23,
        'watts_per_kilogram' => 24,
        'enum_battery_status' => 25,
        'enum_bike_light_beam_angle_mode' => 26,
        'enum_bike_light_battery_status' => 27,
        'enum_bike_light_network_config_type' => 28,
        'lights' => 29,
        'seconds' => 30,
        'minutes' => 31,
        'hours' => 32,
        'calories' => 33,
        'kilojoules' => 34,
        'milliseconds' => 35,
        'second_per_mile' => 36,
        'second_per_kilometer' => 37,
        'centimeter' => 38,
        'enum_course_point' => 39,
        'bradians' => 40,
        'enum_sport' => 41,
        'inches_hg' => 42,
        'mm_hg' => 43,
        'mbars' => 44,
        'hecto_pascals' => 45,
        'feet_per_min' => 46,
        'meters_per_min' => 47,
        'meters_per_sec' => 48,
        'eight_cardinal' => 49,
    },

    'exd_qualifiers' => +{
        '_base_type' => FIT_ENUM,
        'no_qualifier' => 0,
        'instantaneous' => 1,
        'average' => 2,
        'lap' => 3,
        'maximum' => 4,
        'maximum_average' => 5,
        'maximum_lap' => 6,
        'last_lap' => 7,
        'average_lap' => 8,
        'to_destination' => 9,
        'to_go' => 10,
        'to_next' => 11,
        'next_course_point' => 12,
        'total' => 13,
        'three_second_average' => 14,
        'ten_second_average' => 15,
        'thirty_second_average' => 16,
        'percent_maximum' => 17,
        'percent_maximum_average' => 18,
        'lap_percent_maximum' => 19,
        'elapsed' => 20,
        'sunrise' => 21,
        'sunset' => 22,
        'compared_to_virtual_partner' => 23,
        'maximum_24h' => 24,
        'minimum_24h' => 25,
        'minimum' => 26,
        'first' => 27,
        'second' => 28,
        'third' => 29,
        'shifter' => 30,
        'last_sport' => 31,
        'moving' => 32,
        'stopped' => 33,
        'estimated_total' => 34,
        'zone_9' => 242,
        'zone_8' => 243,
        'zone_7' => 244,
        'zone_6' => 245,
        'zone_5' => 246,
        'zone_4' => 247,
        'zone_3' => 248,
        'zone_2' => 249,
        'zone_1' => 250,
    },

    'exd_descriptors' => +{
        '_base_type' => FIT_ENUM,
        'bike_light_battery_status' => 0,
        'beam_angle_status' => 1,
        'batery_level' => 2,
        'light_network_mode' => 3,
        'number_lights_connected' => 4,
        'cadence' => 5,
        'distance' => 6,
        'estimated_time_of_arrival' => 7,
        'heading' => 8,
        'time' => 9,
        'battery_level' => 10,
        'trainer_resistance' => 11,
        'trainer_target_power' => 12,
        'time_seated' => 13,
        'time_standing' => 14,
        'elevation' => 15,
        'grade' => 16,
        'ascent' => 17,
        'descent' => 18,
        'vertical_speed' => 19,
        'di2_battery_level' => 20,
        'front_gear' => 21,
        'rear_gear' => 22,
        'gear_ratio' => 23,
        'heart_rate' => 24,
        'heart_rate_zone' => 25,
        'time_in_heart_rate_zone' => 26,
        'heart_rate_reserve' => 27,
        'calories' => 28,
        'gps_accuracy' => 29,
        'gps_signal_strength' => 30,
        'temperature' => 31,
        'time_of_day' => 32,
        'balance' => 33,
        'pedal_smoothness' => 34,
        'power' => 35,
        'functional_threshold_power' => 36,
        'intensity_factor' => 37,
        'work' => 38,
        'power_ratio' => 39,
        'normalized_power' => 40,
        'training_stress_score' => 41,
        'time_on_zone' => 42,
        'speed' => 43,
        'laps' => 44,
        'reps' => 45,
        'workout_step' => 46,
        'course_distance' => 47,
        'navigation_distance' => 48,
        'course_estimated_time_of_arrival' => 49,
        'navigation_estimated_time_of_arrival' => 50,
        'course_time' => 51,
        'navigation_time' => 52,
        'course_heading' => 53,
        'navigation_heading' => 54,
        'power_zone' => 55,
        'torque_effectiveness' => 56,
        'timer_time' => 57,
        'power_weight_ratio' => 58,
        'left_platform_center_offset' => 59,
        'right_platform_center_offset' => 60,
        'left_power_phase_start_angle' => 61,
        'right_power_phase_start_angle' => 62,
        'left_power_phase_finish_angle' => 63,
        'right_power_phase_finish_angle' => 64,
        'gears' => 65,
        'pace' => 66,
        'training_effect' => 67,
        'vertical_oscillation' => 68,
        'vertical_ratio' => 69,
        'ground_contact_time' => 70,
        'left_ground_contact_time_balance' => 71,
        'right_ground_contact_time_balance' => 72,
        'stride_length' => 73,
        'running_cadence' => 74,
        'performance_condition' => 75,
        'course_type' => 76,
        'time_in_power_zone' => 77,
        'navigation_turn' => 78,
        'course_location' => 79,
        'navigation_location' => 80,
        'compass' => 81,
        'gear_combo' => 82,
        'muscle_oxygen' => 83,
        'icon' => 84,
        'compass_heading' => 85,
        'gps_heading' => 86,
        'gps_elevation' => 87,
        'anaerobic_training_effect' => 88,
        'course' => 89,
        'off_course' => 90,
        'glide_ratio' => 91,
        'vertical_distance' => 92,
        'vmg' => 93,
        'ambient_pressure' => 94,
        'pressure' => 95,
        'vam' => 96,
    },

    'auto_activity_detect' => +{
        '_base_type' => FIT_UINT32,
        'none' => 0x00000000,
        'running' => 0x00000001,
        'cycling' => 0x00000002,
        'swimming' => 0x00000004,
        'walking' => 0x00000008,
        'elliptical' => 0x00000020,
        'sedentary' => 0x00000400,
    },

    'supported_exd_screen_layouts' => +{
        '_base_type' => FIT_UINT32Z,
        'full_screen' => 0x00000001,
        'half_vertical' => 0x00000002,
        'half_horizontal' => 0x00000004,
        'half_vertical_right_split' => 0x00000008,
        'half_horizontal_bottom_split' => 0x00000010,
        'full_quarter_split' => 0x00000020,
        'half_vertical_left_split' => 0x00000040,
        'half_horizontal_top_split' => 0x00000080,
    },

    'fit_base_type' => +{
        '_base_type' => FIT_UINT8,
        'enum' => 0,
        'sint8' => 1,
        'uint8' => 2,
        'sint16' => 131,
        'uint16' => 132,
        'sint32' => 133,
        'uint32' => 134,
        'string' => 7,
        'float32' => 136,
        'float64' => 137,
        'uint8z' => 10,
        'uint16z' => 139,
        'uint32z' => 140,
        'byte' => 13,
        'sint64' => 142,
        'uint64' => 143,
        'uint64z' => 144,
    },

    'turn_type' => +{
        '_base_type' => FIT_ENUM,
        'arriving_idx' => 0,
        'arriving_left_idx' => 1,
        'arriving_right_idx' => 2,
        'arriving_via_idx' => 3,
        'arriving_via_left_idx' => 4,
        'arriving_via_right_idx' => 5,
        'bear_keep_left_idx' => 6,
        'bear_keep_right_idx' => 7,
        'continue_idx' => 8,
        'exit_left_idx' => 9,
        'exit_right_idx' => 10,
        'ferry_idx' => 11,
        'roundabout_45_idx' => 12,
        'roundabout_90_idx' => 13,
        'roundabout_135_idx' => 14,
        'roundabout_180_idx' => 15,
        'roundabout_225_idx' => 16,
        'roundabout_270_idx' => 17,
        'roundabout_315_idx' => 18,
        'roundabout_360_idx' => 19,
        'roundabout_neg_45_idx' => 20,
        'roundabout_neg_90_idx' => 21,
        'roundabout_neg_135_idx' => 22,
        'roundabout_neg_180_idx' => 23,
        'roundabout_neg_225_idx' => 24,
        'roundabout_neg_270_idx' => 25,
        'roundabout_neg_315_idx' => 26,
        'roundabout_neg_360_idx' => 27,
        'roundabout_generic_idx' => 28,
        'roundabout_neg_generic_idx' => 29,
        'sharp_turn_left_idx' => 30,
        'sharp_turn_right_idx' => 31,
        'turn_left_idx' => 32,
        'turn_right_idx' => 33,
        'uturn_left_idx' => 34,
        'uturn_right_idx' => 35,
        'icon_inv_idx' => 36,
        'icon_idx_cnt' => 37,
    },

    'bike_light_beam_angle_mode' => +{
        '_base_type' => FIT_ENUM,
        'manual' => 0,
        'auto' => 1,
    },

    'fit_base_unit' => +{
        '_base_type' => FIT_UINT16,
        'other' => 0,
        'kilogram' => 1,
        'pound' => 2,
    },

    'set_type' => +{
        '_base_type' => FIT_UINT8,
        'rest' => 0,
        'active' => 1,
    },

    'max_met_category' => +{
        '_base_type' => FIT_ENUM,
        'generic' => 0,
        'cycling' => 1,
        },

    'exercise_category' => +{
        '_base_type' => FIT_UINT16,
        'bench_press' => 0,
        'calf_raise' => 1,
        'cardio' => 2,
        'carry' => 3,
        'chop' => 4,
        'core' => 5,
        'crunch' => 6,
        'curl' => 7,
        'deadlift' => 8,
        'flye' => 9,
        'hip_raise' => 10,
        'hip_stability' => 11,
        'hip_swing' => 12,
        'hyperextension' => 13,
        'lateral_raise' => 14,
        'leg_curl' => 15,
        'leg_raise' => 16,
        'lunge' => 17,
        'olympic_lift' => 18,
        'plank' => 19,
        'plyo' => 20,
        'pull_up' => 21,
        'push_up' => 22,
        'row' => 23,
        'shoulder_press' => 24,
        'shoulder_stability' => 25,
        'shrug' => 26,
        'sit_up' => 27,
        'squat' => 28,
        'total_body' => 29,
        'triceps_extension' => 30,
        'warm_up' => 31,
        'run' => 32,
        'unknown' => 65534,
    },

    'bench_press_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'alternating_dumbbell_chest_press_on_swiss_ball' => 0,
        'barbell_bench_press' => 1,
        'barbell_board_bench_press' => 2,
        'barbell_floor_press' => 3,
        'close_grip_barbell_bench_press' => 4,
        'decline_dumbbell_bench_press' => 5,
        'dumbbell_bench_press' => 6,
        'dumbbell_floor_press' => 7,
        'incline_barbell_bench_press' => 8,
        'incline_dumbbell_bench_press' => 9,
        'incline_smith_machine_bench_press' => 10,
        'isometric_barbell_bench_press' => 11,
        'kettlebell_chest_press' => 12,
        'neutral_grip_dumbbell_bench_press' => 13,
        'neutral_grip_dumbbell_incline_bench_press' => 14,
        'one_arm_floor_press' => 15,
        'weighted_one_arm_floor_press' => 16,
        'partial_lockout' => 17,
        'reverse_grip_barbell_bench_press' => 18,
        'reverse_grip_incline_bench_press' => 19,
        'single_arm_cable_chest_press' => 20,
        'single_arm_dumbbell_bench_press' => 21,
        'smith_machine_bench_press' => 22,
        'swiss_ball_dumbbell_chest_press' => 23,
        'triple_stop_barbell_bench_press' => 24,
        'wide_grip_barbell_bench_press' => 25,
        'alternating_dumbbell_chest_press' => 26,
    },

    'calf_raise_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        '3_way_calf_raise' => 0,
        '3_way_weighted_calf_raise' => 1,
        '3_way_single_leg_calf_raise' => 2,
        '3_way_weighted_single_leg_calf_raise' => 3,
        'donkey_calf_raise' => 4,
        'weighted_donkey_calf_raise' => 5,
        'seated_calf_raise' => 6,
        'weighted_seated_calf_raise' => 7,
        'seated_dumbbell_toe_raise' => 8,
        'single_leg_bent_knee_calf_raise' => 9,
        'weighted_single_leg_bent_knee_calf_raise' => 10,
        'single_leg_decline_push_up' => 11,
        'single_leg_donkey_calf_raise' => 12,
        'weighted_single_leg_donkey_calf_raise' => 13,
        'single_leg_hip_raise_with_knee_hold' => 14,
        'single_leg_standing_calf_raise' => 15,
        'single_leg_standing_dumbbell_calf_raise' => 16,
        'standing_barbell_calf_raise' => 17,
        'standing_calf_raise' => 18,
        'weighted_standing_calf_raise' => 19,
        'standing_dumbbell_calf_raise' => 20,
    },

    'cardio_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'bob_and_weave_circle' => 0,
        'weighted_bob_and_weave_circle' => 1,
        'cardio_core_crawl' => 2,
        'weighted_cardio_core_crawl' => 3,
        'double_under' => 4,
        'weighted_double_under' => 5,
        'jump_rope' => 6,
        'weighted_jump_rope' => 7,
        'jump_rope_crossover' => 8,
        'weighted_jump_rope_crossover' => 9,
        'jump_rope_jog' => 10,
        'weighted_jump_rope_jog' => 11,
        'jumping_jacks' => 12,
        'weighted_jumping_jacks' => 13,
        'ski_moguls' => 14,
        'weighted_ski_moguls' => 15,
        'split_jacks' => 16,
        'weighted_split_jacks' => 17,
        'squat_jacks' => 18,
        'weighted_squat_jacks' => 19,
        'triple_under' => 20,
        'weighted_triple_under' => 21,
    },

    'carry_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'bar_holds' => 0,
        'farmers_walk' => 1,
        'farmers_walk_on_toes' => 2,
        'hex_dumbbell_hold' => 3,
        'overhead_carry' => 4,
    },

    'chop_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'cable_pull_through' => 0,
        'cable_rotational_lift' => 1,
        'cable_woodchop' => 2,
        'cross_chop_to_knee' => 3,
        'weighted_cross_chop_to_knee' => 4,
        'dumbbell_chop' => 5,
        'half_kneeling_rotation' => 6,
        'weighted_half_kneeling_rotation' => 7,
        'half_kneeling_rotational_chop' => 8,
        'half_kneeling_rotational_reverse_chop' => 9,
        'half_kneeling_stability_chop' => 10,
        'half_kneeling_stability_reverse_chop' => 11,
        'kneeling_rotational_chop' => 12,
        'kneeling_rotational_reverse_chop' => 13,
        'kneeling_stability_chop' => 14,
        'kneeling_woodchopper' => 15,
        'medicine_ball_wood_chops' => 16,
        'power_squat_chops' => 17,
        'weighted_power_squat_chops' => 18,
        'standing_rotational_chop' => 19,
        'standing_split_rotational_chop' => 20,
        'standing_split_rotational_reverse_chop' => 21,
        'standing_stability_reverse_chop' => 22,
    },

    'core_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'abs_jabs' => 0,
        'weighted_abs_jabs' => 1,
        'alternating_plate_reach' => 2,
        'barbell_rollout' => 3,
        'weighted_barbell_rollout' => 4,
        'body_bar_oblique_twist' => 5,
        'cable_core_press' => 6,
        'cable_side_bend' => 7,
        'side_bend' => 8,
        'weighted_side_bend' => 9,
        'crescent_circle' => 10,
        'weighted_crescent_circle' => 11,
        'cycling_russian_twist' => 12,
        'weighted_cycling_russian_twist' => 13,
        'elevated_feet_russian_twist' => 14,
        'weighted_elevated_feet_russian_twist' => 15,
        'half_turkish_get_up' => 16,
        'kettlebell_windmill' => 17,
        'kneeling_ab_wheel' => 18,
        'weighted_kneeling_ab_wheel' => 19,
        'modified_front_lever' => 20,
        'open_knee_tucks' => 21,
        'weighted_open_knee_tucks' => 22,
        'side_abs_leg_lift' => 23,
        'weighted_side_abs_leg_lift' => 24,
        'swiss_ball_jackknife' => 25,
        'weighted_swiss_ball_jackknife' => 26,
        'swiss_ball_pike' => 27,
        'weighted_swiss_ball_pike' => 28,
        'swiss_ball_rollout' => 29,
        'weighted_swiss_ball_rollout' => 30,
        'triangle_hip_press' => 31,
        'weighted_triangle_hip_press' => 32,
        'trx_suspended_jackknife' => 33,
        'weighted_trx_suspended_jackknife' => 34,
        'u_boat' => 35,
        'weighted_u_boat' => 36,
        'windmill_switches' => 37,
        'weighted_windmill_switches' => 38,
        'alternating_slide_out' => 39,
        'weighted_alternating_slide_out' => 40,
        'ghd_back_extensions' => 41,
        'weighted_ghd_back_extensions' => 42,
        'overhead_walk' => 43,
        'inchworm' => 44,
        'weighted_modified_front_lever' => 45,
        'russian_twist' => 46,
        'abdominal_leg_rotations' => 47, # Deprecated do not use
        'arm_and_leg_extension_on_knees' => 48,
        'bicycle' => 49,
        'bicep_curl_with_leg_extension' => 50,
        'cat_cow' => 51,
        'corkscrew' => 52,
        'criss_cross' => 53,
        'criss_cross_with_ball' => 54, # Deprecated do not use
        'double_leg_stretch' => 55,
        'knee_folds' => 56,
        'lower_lift' => 57,
        'neck_pull' => 58,
        'pelvic_clocks' => 59,
        'roll_over' => 60,
        'roll_up' => 61,
        'rolling' => 62,
        'rowing_1' => 63,
        'rowing_2' => 64,
        'scissors' => 65,
        'single_leg_circles' => 66,
        'single_leg_stretch' => 67,
        'snake_twist_1_and_2' => 68, # Deprecated do not use
        'swan' => 69,
        'swimming' => 70,
        'teaser' => 71,
        'the_hundred' => 72,
    },

    'crunch_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'bicycle_crunch' => 0,
        'cable_crunch' => 1,
        'circular_arm_crunch' => 2,
        'crossed_arms_crunch' => 3,
        'weighted_crossed_arms_crunch' => 4,
        'cross_leg_reverse_crunch' => 5,
        'weighted_cross_leg_reverse_crunch' => 6,
        'crunch_chop' => 7,
        'weighted_crunch_chop' => 8,
        'double_crunch' => 9,
        'weighted_double_crunch' => 10,
        'elbow_to_knee_crunch' => 11,
        'weighted_elbow_to_knee_crunch' => 12,
        'flutter_kicks' => 13,
        'weighted_flutter_kicks' => 14,
        'foam_roller_reverse_crunch_on_bench' => 15,
        'weighted_foam_roller_reverse_crunch_on_bench' => 16,
        'foam_roller_reverse_crunch_with_dumbbell' => 17,
        'foam_roller_reverse_crunch_with_medicine_ball' => 18,
        'frog_press' => 19,
        'hanging_knee_raise_oblique_crunch' => 20,
        'weighted_hanging_knee_raise_oblique_crunch' => 21,
        'hip_crossover' => 22,
        'weighted_hip_crossover' => 23,
        'hollow_rock' => 24,
        'weighted_hollow_rock' => 25,
        'incline_reverse_crunch' => 26,
        'weighted_incline_reverse_crunch' => 27,
        'kneeling_cable_crunch' => 28,
        'kneeling_cross_crunch' => 29,
        'weighted_kneeling_cross_crunch' => 30,
        'kneeling_oblique_cable_crunch' => 31,
        'knees_to_elbow' => 32,
        'leg_extensions' => 33,
        'weighted_leg_extensions' => 34,
        'leg_levers' => 35,
        'mcgill_curl_up' => 36,
        'weighted_mcgill_curl_up' => 37,
        'modified_pilates_roll_up_with_ball' => 38,
        'weighted_modified_pilates_roll_up_with_ball' => 39,
        'pilates_crunch' => 40,
        'weighted_pilates_crunch' => 41,
        'pilates_roll_up_with_ball' => 42,
        'weighted_pilates_roll_up_with_ball' => 43,
        'raised_legs_crunch' => 44,
        'weighted_raised_legs_crunch' => 45,
        'reverse_crunch' => 46,
        'weighted_reverse_crunch' => 47,
        'reverse_crunch_on_a_bench' => 48,
        'weighted_reverse_crunch_on_a_bench' => 49,
        'reverse_curl_and_lift' => 50,
        'weighted_reverse_curl_and_lift' => 51,
        'rotational_lift' => 52,
        'weighted_rotational_lift' => 53,
        'seated_alternating_reverse_crunch' => 54,
        'weighted_seated_alternating_reverse_crunch' => 55,
        'seated_leg_u' => 56,
        'weighted_seated_leg_u' => 57,
        'side_to_side_crunch_and_weave' => 58,
        'weighted_side_to_side_crunch_and_weave' => 59,
        'single_leg_reverse_crunch' => 60,
        'weighted_single_leg_reverse_crunch' => 61,
        'skater_crunch_cross' => 62,
        'weighted_skater_crunch_cross' => 63,
        'standing_cable_crunch' => 64,
        'standing_side_crunch' => 65,
        'step_climb' => 66,
        'weighted_step_climb' => 67,
        'swiss_ball_crunch' => 68,
        'swiss_ball_reverse_crunch' => 69,
        'weighted_swiss_ball_reverse_crunch' => 70,
        'swiss_ball_russian_twist' => 71,
        'weighted_swiss_ball_russian_twist' => 72,
        'swiss_ball_side_crunch' => 73,
        'weighted_swiss_ball_side_crunch' => 74,
        'thoracic_crunches_on_foam_roller' => 75,
        'weighted_thoracic_crunches_on_foam_roller' => 76,
        'triceps_crunch' => 77,
        'weighted_bicycle_crunch' => 78,
        'weighted_crunch' => 79,
        'weighted_swiss_ball_crunch' => 80,
        'toes_to_bar' => 81,
        'weighted_toes_to_bar' => 82,
        'crunch' => 83,
        'straight_leg_crunch_with_ball' => 84,
    },

    'curl_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'alternating_dumbbell_biceps_curl' => 0,
        'alternating_dumbbell_biceps_curl_on_swiss_ball' => 1,
        'alternating_incline_dumbbell_biceps_curl' => 2,
        'barbell_biceps_curl' => 3,
        'barbell_reverse_wrist_curl' => 4,
        'barbell_wrist_curl' => 5,
        'behind_the_back_barbell_reverse_wrist_curl' => 6,
        'behind_the_back_one_arm_cable_curl' => 7,
        'cable_biceps_curl' => 8,
        'cable_hammer_curl' => 9,
        'cheating_barbell_biceps_curl' => 10,
        'close_grip_ez_bar_biceps_curl' => 11,
        'cross_body_dumbbell_hammer_curl' => 12,
        'dead_hang_biceps_curl' => 13,
        'decline_hammer_curl' => 14,
        'dumbbell_biceps_curl_with_static_hold' => 15,
        'dumbbell_hammer_curl' => 16,
        'dumbbell_reverse_wrist_curl' => 17,
        'dumbbell_wrist_curl' => 18,
        'ez_bar_preacher_curl' => 19,
        'forward_bend_biceps_curl' => 20,
        'hammer_curl_to_press' => 21,
        'incline_dumbbell_biceps_curl' => 22,
        'incline_offset_thumb_dumbbell_curl' => 23,
        'kettlebell_biceps_curl' => 24,
        'lying_concentration_cable_curl' => 25,
        'one_arm_preacher_curl' => 26,
        'plate_pinch_curl' => 27,
        'preacher_curl_with_cable' => 28,
        'reverse_ez_bar_curl' => 29,
        'reverse_grip_wrist_curl' => 30,
        'reverse_grip_barbell_biceps_curl' => 31,
        'seated_alternating_dumbbell_biceps_curl' => 32,
        'seated_dumbbell_biceps_curl' => 33,
        'seated_reverse_dumbbell_curl' => 34,
        'split_stance_offset_pinky_dumbbell_curl' => 35,
        'standing_alternating_dumbbell_curls' => 36,
        'standing_dumbbell_biceps_curl' => 37,
        'standing_ez_bar_biceps_curl' => 38,
        'static_curl' => 39,
        'swiss_ball_dumbbell_overhead_triceps_extension' => 40,
        'swiss_ball_ez_bar_preacher_curl' => 41,
        'twisting_standing_dumbbell_biceps_curl' => 42,
        'wide_grip_ez_bar_biceps_curl' => 43,
    },

    'deadlift_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'barbell_deadlift' => 0,
        'barbell_straight_leg_deadlift' => 1,
        'dumbbell_deadlift' => 2,
        'dumbbell_single_leg_deadlift_to_row' => 3,
        'dumbbell_straight_leg_deadlift' => 4,
        'kettlebell_floor_to_shelf' => 5,
        'one_arm_one_leg_deadlift' => 6,
        'rack_pull' => 7,
        'rotational_dumbbell_straight_leg_deadlift' => 8,
        'single_arm_deadlift' => 9,
        'single_leg_barbell_deadlift' => 10,
        'single_leg_barbell_straight_leg_deadlift' => 11,
        'single_leg_deadlift_with_barbell' => 12,
        'single_leg_rdl_circuit' => 13,
        'single_leg_romanian_deadlift_with_dumbbell' => 14,
        'sumo_deadlift' => 15,
        'sumo_deadlift_high_pull' => 16,
        'trap_bar_deadlift' => 17,
        'wide_grip_barbell_deadlift' => 18,
    },

    'flye_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'cable_crossover' => 0,
        'decline_dumbbell_flye' => 1,
        'dumbbell_flye' => 2,
        'incline_dumbbell_flye' => 3,
        'kettlebell_flye' => 4,
        'kneeling_rear_flye' => 5,
        'single_arm_standing_cable_reverse_flye' => 6,
        'swiss_ball_dumbbell_flye' => 7,
        'arm_rotations' => 8,
        'hug_a_tree' => 9,
    },

    'hip_raise_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'barbell_hip_thrust_on_floor' => 0,
        'barbell_hip_thrust_with_bench' => 1,
        'bent_knee_swiss_ball_reverse_hip_raise' => 2,
        'weighted_bent_knee_swiss_ball_reverse_hip_raise' => 3,
        'bridge_with_leg_extension' => 4,
        'weighted_bridge_with_leg_extension' => 5,
        'clam_bridge' => 6,
        'front_kick_tabletop' => 7,
        'weighted_front_kick_tabletop' => 8,
        'hip_extension_and_cross' => 9,
        'weighted_hip_extension_and_cross' => 10,
        'hip_raise' => 11,
        'weighted_hip_raise' => 12,
        'hip_raise_with_feet_on_swiss_ball' => 13,
        'weighted_hip_raise_with_feet_on_swiss_ball' => 14,
        'hip_raise_with_head_on_bosu_ball' => 15,
        'weighted_hip_raise_with_head_on_bosu_ball' => 16,
        'hip_raise_with_head_on_swiss_ball' => 17,
        'weighted_hip_raise_with_head_on_swiss_ball' => 18,
        'hip_raise_with_knee_squeeze' => 19,
        'weighted_hip_raise_with_knee_squeeze' => 20,
        'incline_rear_leg_extension' => 21,
        'weighted_incline_rear_leg_extension' => 22,
        'kettlebell_swing' => 23,
        'marching_hip_raise' => 24,
        'weighted_marching_hip_raise' => 25,
        'marching_hip_raise_with_feet_on_a_swiss_ball' => 26,
        'weighted_marching_hip_raise_with_feet_on_a_swiss_ball' => 27,
        'reverse_hip_raise' => 28,
        'weighted_reverse_hip_raise' => 29,
        'single_leg_hip_raise' => 30,
        'weighted_single_leg_hip_raise' => 31,
        'single_leg_hip_raise_with_foot_on_bench' => 32,
        'weighted_single_leg_hip_raise_with_foot_on_bench' => 33,
        'single_leg_hip_raise_with_foot_on_bosu_ball' => 34,
        'weighted_single_leg_hip_raise_with_foot_on_bosu_ball' => 35,
        'single_leg_hip_raise_with_foot_on_foam_roller' => 36,
        'weighted_single_leg_hip_raise_with_foot_on_foam_roller' => 37,
        'single_leg_hip_raise_with_foot_on_medicine_ball' => 38,
        'weighted_single_leg_hip_raise_with_foot_on_medicine_ball' => 39,
        'single_leg_hip_raise_with_head_on_bosu_ball' => 40,
        'weighted_single_leg_hip_raise_with_head_on_bosu_ball' => 41,
        'weighted_clam_bridge' => 42,
        'single_leg_swiss_ball_hip_raise_and_leg_curl' => 43,
        'clams' => 44,
        'inner_thigh_circles' => 45, # Deprecated do not use
        'inner_thigh_side_lift' => 46, # Deprecated do not use
        'leg_circles' => 47,
        'leg_lift' => 48,
        'leg_lift_in_external_rotation' => 49,
    },

    'hip_stability_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'band_side_lying_leg_raise' => 0,
        'dead_bug' => 1,
        'weighted_dead_bug' => 2,
        'external_hip_raise' => 3,
        'weighted_external_hip_raise' => 4,
        'fire_hydrant_kicks' => 5,
        'weighted_fire_hydrant_kicks' => 6,
        'hip_circles' => 7,
        'weighted_hip_circles' => 8,
        'inner_thigh_lift' => 9,
        'weighted_inner_thigh_lift' => 10,
        'lateral_walks_with_band_at_ankles' => 11,
        'pretzel_side_kick' => 12,
        'weighted_pretzel_side_kick' => 13,
        'prone_hip_internal_rotation' => 14,
        'weighted_prone_hip_internal_rotation' => 15,
        'quadruped' => 16,
        'quadruped_hip_extension' => 17,
        'weighted_quadruped_hip_extension' => 18,
        'quadruped_with_leg_lift' => 19,
        'weighted_quadruped_with_leg_lift' => 20,
        'side_lying_leg_raise' => 21,
        'weighted_side_lying_leg_raise' => 22,
        'sliding_hip_adduction' => 23,
        'weighted_sliding_hip_adduction' => 24,
        'standing_adduction' => 25,
        'weighted_standing_adduction' => 26,
        'standing_cable_hip_abduction' => 27,
        'standing_hip_abduction' => 28,
        'weighted_standing_hip_abduction' => 29,
        'standing_rear_leg_raise' => 30,
        'weighted_standing_rear_leg_raise' => 31,
        'supine_hip_internal_rotation' => 32,
        'weighted_supine_hip_internal_rotation' => 33,
    },

    'hip_swing_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'single_arm_kettlebell_swing' => 0,
        'single_arm_dumbbell_swing' => 1,
        'step_out_swing' => 2,
    },

    'hyperextension_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'back_extension_with_opposite_arm_and_leg_reach' => 0,
        'weighted_back_extension_with_opposite_arm_and_leg_reach' => 1,
        'base_rotations' => 2,
        'weighted_base_rotations' => 3,
        'bent_knee_reverse_hyperextension' => 4,
        'weighted_bent_knee_reverse_hyperextension' => 5,
        'hollow_hold_and_roll' => 6,
        'weighted_hollow_hold_and_roll' => 7,
        'kicks' => 8,
        'weighted_kicks' => 9,
        'knee_raises' => 10,
        'weighted_knee_raises' => 11,
        'kneeling_superman' => 12,
        'weighted_kneeling_superman' => 13,
        'lat_pull_down_with_row' => 14,
        'medicine_ball_deadlift_to_reach' => 15,
        'one_arm_one_leg_row' => 16,
        'one_arm_row_with_band' => 17,
        'overhead_lunge_with_medicine_ball' => 18,
        'plank_knee_tucks' => 19,
        'weighted_plank_knee_tucks' => 20,
        'side_step' => 21,
        'weighted_side_step' => 22,
        'single_leg_back_extension' => 23,
        'weighted_single_leg_back_extension' => 24,
        'spine_extension' => 25,
        'weighted_spine_extension' => 26,
        'static_back_extension' => 27,
        'weighted_static_back_extension' => 28,
        'superman_from_floor' => 29,
        'weighted_superman_from_floor' => 30,
        'swiss_ball_back_extension' => 31,
        'weighted_swiss_ball_back_extension' => 32,
        'swiss_ball_hyperextension' => 33,
        'weighted_swiss_ball_hyperextension' => 34,
        'swiss_ball_opposite_arm_and_leg_lift' => 35,
        'weighted_swiss_ball_opposite_arm_and_leg_lift' => 36,
        'superman_on_swiss_ball' => 37,
        'cobra' => 38,
        'supine_floor_barre' => 39, # Deprecated do not use
    },

    'lateral_raise_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        '45_degree_cable_external_rotation' => 0,
        'alternating_lateral_raise_with_static_hold' => 1,
        'bar_muscle_up' => 2,
        'bent_over_lateral_raise' => 3,
        'cable_diagonal_raise' => 4,
        'cable_front_raise' => 5,
        'calorie_row' => 6,
        'combo_shoulder_raise' => 7,
        'dumbbell_diagonal_raise' => 8,
        'dumbbell_v_raise' => 9,
        'front_raise' => 10,
        'leaning_dumbbell_lateral_raise' => 11,
        'lying_dumbbell_raise' => 12,
        'muscle_up' => 13,
        'one_arm_cable_lateral_raise' => 14,
        'overhand_grip_rear_lateral_raise' => 15,
        'plate_raises' => 16,
        'ring_dip' => 17,
        'weighted_ring_dip' => 18,
        'ring_muscle_up' => 19,
        'weighted_ring_muscle_up' => 20,
        'rope_climb' => 21,
        'weighted_rope_climb' => 22,
        'scaption' => 23,
        'seated_lateral_raise' => 24,
        'seated_rear_lateral_raise' => 25,
        'side_lying_lateral_raise' => 26,
        'standing_lift' => 27,
        'suspended_row' => 28,
        'underhand_grip_rear_lateral_raise' => 29,
        'wall_slide' => 30,
        'weighted_wall_slide' => 31,
        'arm_circles' => 32,
        'shaving_the_head' => 33,
    },

    'leg_curl_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'leg_curl' => 0,
        'weighted_leg_curl' => 1,
        'good_morning' => 2,
        'seated_barbell_good_morning' => 3,
        'single_leg_barbell_good_morning' => 4,
        'single_leg_sliding_leg_curl' => 5,
        'sliding_leg_curl' => 6,
        'split_barbell_good_morning' => 7,
        'split_stance_extension' => 8,
        'staggered_stance_good_morning' => 9,
        'swiss_ball_hip_raise_and_leg_curl' => 10,
        'zercher_good_morning' => 11,
    },

    'leg_raise_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'hanging_knee_raise' => 0,
        'hanging_leg_raise' => 1,
        'weighted_hanging_leg_raise' => 2,
        'hanging_single_leg_raise' => 3,
        'weighted_hanging_single_leg_raise' => 4,
        'kettlebell_leg_raises' => 5,
        'leg_lowering_drill' => 6,
        'weighted_leg_lowering_drill' => 7,
        'lying_straight_leg_raise' => 8,
        'weighted_lying_straight_leg_raise' => 9,
        'medicine_ball_leg_drops' => 10,
        'quadruped_leg_raise' => 11,
        'weighted_quadruped_leg_raise' => 12,
        'reverse_leg_raise' => 13,
        'weighted_reverse_leg_raise' => 14,
        'reverse_leg_raise_on_swiss_ball' => 15,
        'weighted_reverse_leg_raise_on_swiss_ball' => 16,
        'single_leg_lowering_drill' => 17,
        'weighted_single_leg_lowering_drill' => 18,
        'weighted_hanging_knee_raise' => 19,
        'lateral_stepover' => 20,
        'weighted_lateral_stepover' => 21,
    },

    'lunge_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'overhead_lunge' => 0,
        'lunge_matrix' => 1,
        'weighted_lunge_matrix' => 2,
        'alternating_barbell_forward_lunge' => 3,
        'alternating_dumbbell_lunge_with_reach' => 4,
        'back_foot_elevated_dumbbell_split_squat' => 5,
        'barbell_box_lunge' => 6,
        'barbell_bulgarian_split_squat' => 7,
        'barbell_crossover_lunge' => 8,
        'barbell_front_split_squat' => 9,
        'barbell_lunge' => 10,
        'barbell_reverse_lunge' => 11,
        'barbell_side_lunge' => 12,
        'barbell_split_squat' => 13,
        'core_control_rear_lunge' => 14,
        'diagonal_lunge' => 15,
        'drop_lunge' => 16,
        'dumbbell_box_lunge' => 17,
        'dumbbell_bulgarian_split_squat' => 18,
        'dumbbell_crossover_lunge' => 19,
        'dumbbell_diagonal_lunge' => 20,
        'dumbbell_lunge' => 21,
        'dumbbell_lunge_and_rotation' => 22,
        'dumbbell_overhead_bulgarian_split_squat' => 23,
        'dumbbell_reverse_lunge_to_high_knee_and_press' => 24,
        'dumbbell_side_lunge' => 25,
        'elevated_front_foot_barbell_split_squat' => 26,
        'front_foot_elevated_dumbbell_split_squat' => 27,
        'gunslinger_lunge' => 28,
        'lawnmower_lunge' => 29,
        'low_lunge_with_isometric_adduction' => 30,
        'low_side_to_side_lunge' => 31,
        'lunge' => 32,
        'weighted_lunge' => 33,
        'lunge_with_arm_reach' => 34,
        'lunge_with_diagonal_reach' => 35,
        'lunge_with_side_bend' => 36,
        'offset_dumbbell_lunge' => 37,
        'offset_dumbbell_reverse_lunge' => 38,
        'overhead_bulgarian_split_squat' => 39,
        'overhead_dumbbell_reverse_lunge' => 40,
        'overhead_dumbbell_split_squat' => 41,
        'overhead_lunge_with_rotation' => 42,
        'reverse_barbell_box_lunge' => 43,
        'reverse_box_lunge' => 44,
        'reverse_dumbbell_box_lunge' => 45,
        'reverse_dumbbell_crossover_lunge' => 46,
        'reverse_dumbbell_diagonal_lunge' => 47,
        'reverse_lunge_with_reach_back' => 48,
        'weighted_reverse_lunge_with_reach_back' => 49,
        'reverse_lunge_with_twist_and_overhead_reach' => 50,
        'weighted_reverse_lunge_with_twist_and_overhead_reach' => 51,
        'reverse_sliding_box_lunge' => 52,
        'weighted_reverse_sliding_box_lunge' => 53,
        'reverse_sliding_lunge' => 54,
        'weighted_reverse_sliding_lunge' => 55,
        'runners_lunge_to_balance' => 56,
        'weighted_runners_lunge_to_balance' => 57,
        'shifting_side_lunge' => 58,
        'side_and_crossover_lunge' => 59,
        'weighted_side_and_crossover_lunge' => 60,
        'side_lunge' => 61,
        'weighted_side_lunge' => 62,
        'side_lunge_and_press' => 63,
        'side_lunge_jump_off' => 64,
        'side_lunge_sweep' => 65,
        'weighted_side_lunge_sweep' => 66,
        'side_lunge_to_crossover_tap' => 67,
        'weighted_side_lunge_to_crossover_tap' => 68,
        'side_to_side_lunge_chops' => 69,
        'weighted_side_to_side_lunge_chops' => 70,
        'siff_jump_lunge' => 71,
        'weighted_siff_jump_lunge' => 72,
        'single_arm_reverse_lunge_and_press' => 73,
        'sliding_lateral_lunge' => 74,
        'weighted_sliding_lateral_lunge' => 75,
        'walking_barbell_lunge' => 76,
        'walking_dumbbell_lunge' => 77,
        'walking_lunge' => 78,
        'weighted_walking_lunge' => 79,
        'wide_grip_overhead_barbell_split_squat' => 80,
    },

    'olympic_lift_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'barbell_hang_power_clean' => 0,
        'barbell_hang_squat_clean' => 1,
        'barbell_power_clean' => 2,
        'barbell_power_snatch' => 3,
        'barbell_squat_clean' => 4,
        'clean_and_jerk' => 5,
        'barbell_hang_power_snatch' => 6,
        'barbell_hang_pull' => 7,
        'barbell_high_pull' => 8,
        'barbell_snatch' => 9,
        'barbell_split_jerk' => 10,
        'clean' => 11,
        'dumbbell_clean' => 12,
        'dumbbell_hang_pull' => 13,
        'one_hand_dumbbell_split_snatch' => 14,
        'push_jerk' => 15,
        'single_arm_dumbbell_snatch' => 16,
        'single_arm_hang_snatch' => 17,
        'single_arm_kettlebell_snatch' => 18,
        'split_jerk' => 19,
        'squat_clean_and_jerk' => 20,
    },

    'plank_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        '45_degree_plank' => 0,
        'weighted_45_degree_plank' => 1,
        '90_degree_static_hold' => 2,
        'weighted_90_degree_static_hold' => 3,
        'bear_crawl' => 4,
        'weighted_bear_crawl' => 5,
        'cross_body_mountain_climber' => 6,
        'weighted_cross_body_mountain_climber' => 7,
        'elbow_plank_pike_jacks' => 8,
        'weighted_elbow_plank_pike_jacks' => 9,
        'elevated_feet_plank' => 10,
        'weighted_elevated_feet_plank' => 11,
        'elevator_abs' => 12,
        'weighted_elevator_abs' => 13,
        'extended_plank' => 14,
        'weighted_extended_plank' => 15,
        'full_plank_passe_twist' => 16,
        'weighted_full_plank_passe_twist' => 17,
        'inching_elbow_plank' => 18,
        'weighted_inching_elbow_plank' => 19,
        'inchworm_to_side_plank' => 20,
        'weighted_inchworm_to_side_plank' => 21,
        'kneeling_plank' => 22,
        'weighted_kneeling_plank' => 23,
        'kneeling_side_plank_with_leg_lift' => 24,
        'weighted_kneeling_side_plank_with_leg_lift' => 25,
        'lateral_roll' => 26,
        'weighted_lateral_roll' => 27,
        'lying_reverse_plank' => 28,
        'weighted_lying_reverse_plank' => 29,
        'medicine_ball_mountain_climber' => 30,
        'weighted_medicine_ball_mountain_climber' => 31,
        'modified_mountain_climber_and_extension' => 32,
        'weighted_modified_mountain_climber_and_extension' => 33,
        'mountain_climber' => 34,
        'weighted_mountain_climber' => 35,
        'mountain_climber_on_sliding_discs' => 36,
        'weighted_mountain_climber_on_sliding_discs' => 37,
        'mountain_climber_with_feet_on_bosu_ball' => 38,
        'weighted_mountain_climber_with_feet_on_bosu_ball' => 39,
        'mountain_climber_with_hands_on_bench' => 40,
        'mountain_climber_with_hands_on_swiss_ball' => 41,
        'weighted_mountain_climber_with_hands_on_swiss_ball' => 42,
        'plank' => 43,
        'plank_jacks_with_feet_on_sliding_discs' => 44,
        'weighted_plank_jacks_with_feet_on_sliding_discs' => 45,
        'plank_knee_twist' => 46,
        'weighted_plank_knee_twist' => 47,
        'plank_pike_jumps' => 48,
        'weighted_plank_pike_jumps' => 49,
        'plank_pikes' => 50,
        'weighted_plank_pikes' => 51,
        'plank_to_stand_up' => 52,
        'weighted_plank_to_stand_up' => 53,
        'plank_with_arm_raise' => 54,
        'weighted_plank_with_arm_raise' => 55,
        'plank_with_knee_to_elbow' => 56,
        'weighted_plank_with_knee_to_elbow' => 57,
        'plank_with_oblique_crunch' => 58,
        'weighted_plank_with_oblique_crunch' => 59,
        'plyometric_side_plank' => 60,
        'weighted_plyometric_side_plank' => 61,
        'rolling_side_plank' => 62,
        'weighted_rolling_side_plank' => 63,
        'side_kick_plank' => 64,
        'weighted_side_kick_plank' => 65,
        'side_plank' => 66,
        'weighted_side_plank' => 67,
        'side_plank_and_row' => 68,
        'weighted_side_plank_and_row' => 69,
        'side_plank_lift' => 70,
        'weighted_side_plank_lift' => 71,
        'side_plank_with_elbow_on_bosu_ball' => 72,
        'weighted_side_plank_with_elbow_on_bosu_ball' => 73,
        'side_plank_with_feet_on_bench' => 74,
        'weighted_side_plank_with_feet_on_bench' => 75,
        'side_plank_with_knee_circle' => 76,
        'weighted_side_plank_with_knee_circle' => 77,
        'side_plank_with_knee_tuck' => 78,
        'weighted_side_plank_with_knee_tuck' => 79,
        'side_plank_with_leg_lift' => 80,
        'weighted_side_plank_with_leg_lift' => 81,
        'side_plank_with_reach_under' => 82,
        'weighted_side_plank_with_reach_under' => 83,
        'single_leg_elevated_feet_plank' => 84,
        'weighted_single_leg_elevated_feet_plank' => 85,
        'single_leg_flex_and_extend' => 86,
        'weighted_single_leg_flex_and_extend' => 87,
        'single_leg_side_plank' => 88,
        'weighted_single_leg_side_plank' => 89,
        'spiderman_plank' => 90,
        'weighted_spiderman_plank' => 91,
        'straight_arm_plank' => 92,
        'weighted_straight_arm_plank' => 93,
        'straight_arm_plank_with_shoulder_touch' => 94,
        'weighted_straight_arm_plank_with_shoulder_touch' => 95,
        'swiss_ball_plank' => 96,
        'weighted_swiss_ball_plank' => 97,
        'swiss_ball_plank_leg_lift' => 98,
        'weighted_swiss_ball_plank_leg_lift' => 99,
        'swiss_ball_plank_leg_lift_and_hold' => 100,
        'swiss_ball_plank_with_feet_on_bench' => 101,
        'weighted_swiss_ball_plank_with_feet_on_bench' => 102,
        'swiss_ball_prone_jackknife' => 103,
        'weighted_swiss_ball_prone_jackknife' => 104,
        'swiss_ball_side_plank' => 105,
        'weighted_swiss_ball_side_plank' => 106,
        'three_way_plank' => 107,
        'weighted_three_way_plank' => 108,
        'towel_plank_and_knee_in' => 109,
        'weighted_towel_plank_and_knee_in' => 110,
        't_stabilization' => 111,
        'weighted_t_stabilization' => 112,
        'turkish_get_up_to_side_plank' => 113,
        'weighted_turkish_get_up_to_side_plank' => 114,
        'two_point_plank' => 115,
        'weighted_two_point_plank' => 116,
        'weighted_plank' => 117,
        'wide_stance_plank_with_diagonal_arm_lift' => 118,
        'weighted_wide_stance_plank_with_diagonal_arm_lift' => 119,
        'wide_stance_plank_with_diagonal_leg_lift' => 120,
        'weighted_wide_stance_plank_with_diagonal_leg_lift' => 121,
        'wide_stance_plank_with_leg_lift' => 122,
        'weighted_wide_stance_plank_with_leg_lift' => 123,
        'wide_stance_plank_with_opposite_arm_and_leg_lift' => 124,
        'weighted_mountain_climber_with_hands_on_bench' => 125,
        'weighted_swiss_ball_plank_leg_lift_and_hold' => 126,
        'weighted_wide_stance_plank_with_opposite_arm_and_leg_lift' => 127,
        'plank_with_feet_on_swiss_ball' => 128,
        'side_plank_to_plank_with_reach_under' => 129,
        'bridge_with_glute_lower_lift' => 130,
        'bridge_one_leg_bridge' => 131,
        'plank_with_arm_variations' => 132,
        'plank_with_leg_lift' => 133,
        'reverse_plank_with_leg_pull' => 134,
    },

    'plyo_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'alternating_jump_lunge' => 0,
        'weighted_alternating_jump_lunge' => 1,
        'barbell_jump_squat' => 2,
        'body_weight_jump_squat' => 3,
        'weighted_jump_squat' => 4,
        'cross_knee_strike' => 5,
        'weighted_cross_knee_strike' => 6,
        'depth_jump' => 7,
        'weighted_depth_jump' => 8,
        'dumbbell_jump_squat' => 9,
        'dumbbell_split_jump' => 10,
        'front_knee_strike' => 11,
        'weighted_front_knee_strike' => 12,
        'high_box_jump' => 13,
        'weighted_high_box_jump' => 14,
        'isometric_explosive_body_weight_jump_squat' => 15,
        'weighted_isometric_explosive_jump_squat' => 16,
        'lateral_leap_and_hop' => 17,
        'weighted_lateral_leap_and_hop' => 18,
        'lateral_plyo_squats' => 19,
        'weighted_lateral_plyo_squats' => 20,
        'lateral_slide' => 21,
        'weighted_lateral_slide' => 22,
        'medicine_ball_overhead_throws' => 23,
        'medicine_ball_side_throw' => 24,
        'medicine_ball_slam' => 25,
        'side_to_side_medicine_ball_throws' => 26,
        'side_to_side_shuffle_jump' => 27,
        'weighted_side_to_side_shuffle_jump' => 28,
        'squat_jump_onto_box' => 29,
        'weighted_squat_jump_onto_box' => 30,
        'squat_jumps_in_and_out' => 31,
        'weighted_squat_jumps_in_and_out' => 32,
    },

    'pull_up_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'banded_pull_ups' => 0,
        '30_degree_lat_pulldown' => 1,
        'band_assisted_chin_up' => 2,
        'close_grip_chin_up' => 3,
        'weighted_close_grip_chin_up' => 4,
        'close_grip_lat_pulldown' => 5,
        'crossover_chin_up' => 6,
        'weighted_crossover_chin_up' => 7,
        'ez_bar_pullover' => 8,
        'hanging_hurdle' => 9,
        'weighted_hanging_hurdle' => 10,
        'kneeling_lat_pulldown' => 11,
        'kneeling_underhand_grip_lat_pulldown' => 12,
        'lat_pulldown' => 13,
        'mixed_grip_chin_up' => 14,
        'weighted_mixed_grip_chin_up' => 15,
        'mixed_grip_pull_up' => 16,
        'weighted_mixed_grip_pull_up' => 17,
        'reverse_grip_pulldown' => 18,
        'standing_cable_pullover' => 19,
        'straight_arm_pulldown' => 20,
        'swiss_ball_ez_bar_pullover' => 21,
        'towel_pull_up' => 22,
        'weighted_towel_pull_up' => 23,
        'weighted_pull_up' => 24,
        'wide_grip_lat_pulldown' => 25,
        'wide_grip_pull_up' => 26,
        'weighted_wide_grip_pull_up' => 27,
        'burpee_pull_up' => 28,
        'weighted_burpee_pull_up' => 29,
        'jumping_pull_ups' => 30,
        'weighted_jumping_pull_ups' => 31,
        'kipping_pull_up' => 32,
        'weighted_kipping_pull_up' => 33,
        'l_pull_up' => 34,
        'weighted_l_pull_up' => 35,
        'suspended_chin_up' => 36,
        'weighted_suspended_chin_up' => 37,
        'pull_up' => 38,
    },

    'push_up_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'chest_press_with_band' => 0,
        'alternating_staggered_push_up' => 1,
        'weighted_alternating_staggered_push_up' => 2,
        'alternating_hands_medicine_ball_push_up' => 3,
        'weighted_alternating_hands_medicine_ball_push_up' => 4,
        'bosu_ball_push_up' => 5,
        'weighted_bosu_ball_push_up' => 6,
        'clapping_push_up' => 7,
        'weighted_clapping_push_up' => 8,
        'close_grip_medicine_ball_push_up' => 9,
        'weighted_close_grip_medicine_ball_push_up' => 10,
        'close_hands_push_up' => 11,
        'weighted_close_hands_push_up' => 12,
        'decline_push_up' => 13,
        'weighted_decline_push_up' => 14,
        'diamond_push_up' => 15,
        'weighted_diamond_push_up' => 16,
        'explosive_crossover_push_up' => 17,
        'weighted_explosive_crossover_push_up' => 18,
        'explosive_push_up' => 19,
        'weighted_explosive_push_up' => 20,
        'feet_elevated_side_to_side_push_up' => 21,
        'weighted_feet_elevated_side_to_side_push_up' => 22,
        'hand_release_push_up' => 23,
        'weighted_hand_release_push_up' => 24,
        'handstand_push_up' => 25,
        'weighted_handstand_push_up' => 26,
        'incline_push_up' => 27,
        'weighted_incline_push_up' => 28,
        'isometric_explosive_push_up' => 29,
        'weighted_isometric_explosive_push_up' => 30,
        'judo_push_up' => 31,
        'weighted_judo_push_up' => 32,
        'kneeling_push_up' => 33,
        'weighted_kneeling_push_up' => 34,
        'medicine_ball_chest_pass' => 35,
        'medicine_ball_push_up' => 36,
        'weighted_medicine_ball_push_up' => 37,
        'one_arm_push_up' => 38,
        'weighted_one_arm_push_up' => 39,
        'weighted_push_up' => 40,
        'push_up_and_row' => 41,
        'weighted_push_up_and_row' => 42,
        'push_up_plus' => 43,
        'weighted_push_up_plus' => 44,
        'push_up_with_feet_on_swiss_ball' => 45,
        'weighted_push_up_with_feet_on_swiss_ball' => 46,
        'push_up_with_one_hand_on_medicine_ball' => 47,
        'weighted_push_up_with_one_hand_on_medicine_ball' => 48,
        'shoulder_push_up' => 49,
        'weighted_shoulder_push_up' => 50,
        'single_arm_medicine_ball_push_up' => 51,
        'weighted_single_arm_medicine_ball_push_up' => 52,
        'spiderman_push_up' => 53,
        'weighted_spiderman_push_up' => 54,
        'stacked_feet_push_up' => 55,
        'weighted_stacked_feet_push_up' => 56,
        'staggered_hands_push_up' => 57,
        'weighted_staggered_hands_push_up' => 58,
        'suspended_push_up' => 59,
        'weighted_suspended_push_up' => 60,
        'swiss_ball_push_up' => 61,
        'weighted_swiss_ball_push_up' => 62,
        'swiss_ball_push_up_plus' => 63,
        'weighted_swiss_ball_push_up_plus' => 64,
        't_push_up' => 65,
        'weighted_t_push_up' => 66,
        'triple_stop_push_up' => 67,
        'weighted_triple_stop_push_up' => 68,
        'wide_hands_push_up' => 69,
        'weighted_wide_hands_push_up' => 70,
        'parallette_handstand_push_up' => 71,
        'weighted_parallette_handstand_push_up' => 72,
        'ring_handstand_push_up' => 73,
        'weighted_ring_handstand_push_up' => 74,
        'ring_push_up' => 75,
        'weighted_ring_push_up' => 76,
        'push_up' => 77,
        'pilates_pushup' => 78,
    },

    'row_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'barbell_straight_leg_deadlift_to_row' => 0,
        'cable_row_standing' => 1,
        'dumbbell_row' => 2,
        'elevated_feet_inverted_row' => 3,
        'weighted_elevated_feet_inverted_row' => 4,
        'face_pull' => 5,
        'face_pull_with_external_rotation' => 6,
        'inverted_row_with_feet_on_swiss_ball' => 7,
        'weighted_inverted_row_with_feet_on_swiss_ball' => 8,
        'kettlebell_row' => 9,
        'modified_inverted_row' => 10,
        'weighted_modified_inverted_row' => 11,
        'neutral_grip_alternating_dumbbell_row' => 12,
        'one_arm_bent_over_row' => 13,
        'one_legged_dumbbell_row' => 14,
        'renegade_row' => 15,
        'reverse_grip_barbell_row' => 16,
        'rope_handle_cable_row' => 17,
        'seated_cable_row' => 18,
        'seated_dumbbell_row' => 19,
        'single_arm_cable_row' => 20,
        'single_arm_cable_row_and_rotation' => 21,
        'single_arm_inverted_row' => 22,
        'weighted_single_arm_inverted_row' => 23,
        'single_arm_neutral_grip_dumbbell_row' => 24,
        'single_arm_neutral_grip_dumbbell_row_and_rotation' => 25,
        'suspended_inverted_row' => 26,
        'weighted_suspended_inverted_row' => 27,
        't_bar_row' => 28,
        'towel_grip_inverted_row' => 29,
        'weighted_towel_grip_inverted_row' => 30,
        'underhand_grip_cable_row' => 31,
        'v_grip_cable_row' => 32,
        'wide_grip_seated_cable_row' => 33,
    },

    'shoulder_press_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'alternating_dumbbell_shoulder_press' => 0,
        'arnold_press' => 1,
        'barbell_front_squat_to_push_press' => 2,
        'barbell_push_press' => 3,
        'barbell_shoulder_press' => 4,
        'dead_curl_press' => 5,
        'dumbbell_alternating_shoulder_press_and_twist' => 6,
        'dumbbell_hammer_curl_to_lunge_to_press' => 7,
        'dumbbell_push_press' => 8,
        'floor_inverted_shoulder_press' => 9,
        'weighted_floor_inverted_shoulder_press' => 10,
        'inverted_shoulder_press' => 11,
        'weighted_inverted_shoulder_press' => 12,
        'one_arm_push_press' => 13,
        'overhead_barbell_press' => 14,
        'overhead_dumbbell_press' => 15,
        'seated_barbell_shoulder_press' => 16,
        'seated_dumbbell_shoulder_press' => 17,
        'single_arm_dumbbell_shoulder_press' => 18,
        'single_arm_step_up_and_press' => 19,
        'smith_machine_overhead_press' => 20,
        'split_stance_hammer_curl_to_press' => 21,
        'swiss_ball_dumbbell_shoulder_press' => 22,
        'weight_plate_front_raise' => 23,
    },

    'shoulder_stability_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        '90_degree_cable_external_rotation' => 0,
        'band_external_rotation' => 1,
        'band_internal_rotation' => 2,
        'bent_arm_lateral_raise_and_external_rotation' => 3,
        'cable_external_rotation' => 4,
        'dumbbell_face_pull_with_external_rotation' => 5,
        'floor_i_raise' => 6,
        'weighted_floor_i_raise' => 7,
        'floor_t_raise' => 8,
        'weighted_floor_t_raise' => 9,
        'floor_y_raise' => 10,
        'weighted_floor_y_raise' => 11,
        'incline_i_raise' => 12,
        'weighted_incline_i_raise' => 13,
        'incline_l_raise' => 14,
        'weighted_incline_l_raise' => 15,
        'incline_t_raise' => 16,
        'weighted_incline_t_raise' => 17,
        'incline_w_raise' => 18,
        'weighted_incline_w_raise' => 19,
        'incline_y_raise' => 20,
        'weighted_incline_y_raise' => 21,
        'lying_external_rotation' => 22,
        'seated_dumbbell_external_rotation' => 23,
        'standing_l_raise' => 24,
        'swiss_ball_i_raise' => 25,
        'weighted_swiss_ball_i_raise' => 26,
        'swiss_ball_t_raise' => 27,
        'weighted_swiss_ball_t_raise' => 28,
        'swiss_ball_w_raise' => 29,
        'weighted_swiss_ball_w_raise' => 30,
        'swiss_ball_y_raise' => 31,
        'weighted_swiss_ball_y_raise' => 32,
    },

    'shrug_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'barbell_jump_shrug' => 0,
        'barbell_shrug' => 1,
        'barbell_upright_row' => 2,
        'behind_the_back_smith_machine_shrug' => 3,
        'dumbbell_jump_shrug' => 4,
        'dumbbell_shrug' => 5,
        'dumbbell_upright_row' => 6,
        'incline_dumbbell_shrug' => 7,
        'overhead_barbell_shrug' => 8,
        'overhead_dumbbell_shrug' => 9,
        'scaption_and_shrug' => 10,
        'scapular_retraction' => 11,
        'serratus_chair_shrug' => 12,
        'weighted_serratus_chair_shrug' => 13,
        'serratus_shrug' => 14,
        'weighted_serratus_shrug' => 15,
        'wide_grip_jump_shrug' => 16,
    },

    'sit_up_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'alternating_sit_up' => 0,
        'weighted_alternating_sit_up' => 1,
        'bent_knee_v_up' => 2,
        'weighted_bent_knee_v_up' => 3,
        'butterfly_sit_up' => 4,
        'weighted_butterfly_situp' => 5,
        'cross_punch_roll_up' => 6,
        'weighted_cross_punch_roll_up' => 7,
        'crossed_arms_sit_up' => 8,
        'weighted_crossed_arms_sit_up' => 9,
        'get_up_sit_up' => 10,
        'weighted_get_up_sit_up' => 11,
        'hovering_sit_up' => 12,
        'weighted_hovering_sit_up' => 13,
        'kettlebell_sit_up' => 14,
        'medicine_ball_alternating_v_up' => 15,
        'medicine_ball_sit_up' => 16,
        'medicine_ball_v_up' => 17,
        'modified_sit_up' => 18,
        'negative_sit_up' => 19,
        'one_arm_full_sit_up' => 20,
        'reclining_circle' => 21,
        'weighted_reclining_circle' => 22,
        'reverse_curl_up' => 23,
        'weighted_reverse_curl_up' => 24,
        'single_leg_swiss_ball_jackknife' => 25,
        'weighted_single_leg_swiss_ball_jackknife' => 26,
        'the_teaser' => 27,
        'the_teaser_weighted' => 28,
        'three_part_roll_down' => 29,
        'weighted_three_part_roll_down' => 30,
        'v_up' => 31,
        'weighted_v_up' => 32,
        'weighted_russian_twist_on_swiss_ball' => 33,
        'weighted_sit_up' => 34,
        'x_abs' => 35,
        'weighted_x_abs' => 36,
        'sit_up' => 37,
    },

    'squat_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'leg_press' => 0,
        'back_squat_with_body_bar' => 1,
        'back_squats' => 2,
        'weighted_back_squats' => 3,
        'balancing_squat' => 4,
        'weighted_balancing_squat' => 5,
        'barbell_back_squat' => 6,
        'barbell_box_squat' => 7,
        'barbell_front_squat' => 8,
        'barbell_hack_squat' => 9,
        'barbell_hang_squat_snatch' => 10,
        'barbell_lateral_step_up' => 11,
        'barbell_quarter_squat' => 12,
        'barbell_siff_squat' => 13,
        'barbell_squat_snatch' => 14,
        'barbell_squat_with_heels_raised' => 15,
        'barbell_stepover' => 16,
        'barbell_step_up' => 17,
        'bench_squat_with_rotational_chop' => 18,
        'weighted_bench_squat_with_rotational_chop' => 19,
        'body_weight_wall_squat' => 20,
        'weighted_wall_squat' => 21,
        'box_step_squat' => 22,
        'weighted_box_step_squat' => 23,
        'braced_squat' => 24,
        'crossed_arm_barbell_front_squat' => 25,
        'crossover_dumbbell_step_up' => 26,
        'dumbbell_front_squat' => 27,
        'dumbbell_split_squat' => 28,
        'dumbbell_squat' => 29,
        'dumbbell_squat_clean' => 30,
        'dumbbell_stepover' => 31,
        'dumbbell_step_up' => 32,
        'elevated_single_leg_squat' => 33,
        'weighted_elevated_single_leg_squat' => 34,
        'figure_four_squats' => 35,
        'weighted_figure_four_squats' => 36,
        'goblet_squat' => 37,
        'kettlebell_squat' => 38,
        'kettlebell_swing_overhead' => 39,
        'kettlebell_swing_with_flip_to_squat' => 40,
        'lateral_dumbbell_step_up' => 41,
        'one_legged_squat' => 42,
        'overhead_dumbbell_squat' => 43,
        'overhead_squat' => 44,
        'partial_single_leg_squat' => 45,
        'weighted_partial_single_leg_squat' => 46,
        'pistol_squat' => 47,
        'weighted_pistol_squat' => 48,
        'plie_slides' => 49,
        'weighted_plie_slides' => 50,
        'plie_squat' => 51,
        'weighted_plie_squat' => 52,
        'prisoner_squat' => 53,
        'weighted_prisoner_squat' => 54,
        'single_leg_bench_get_up' => 55,
        'weighted_single_leg_bench_get_up' => 56,
        'single_leg_bench_squat' => 57,
        'weighted_single_leg_bench_squat' => 58,
        'single_leg_squat_on_swiss_ball' => 59,
        'weighted_single_leg_squat_on_swiss_ball' => 60,
        'squat' => 61,
        'weighted_squat' => 62,
        'squats_with_band' => 63,
        'staggered_squat' => 64,
        'weighted_staggered_squat' => 65,
        'step_up' => 66,
        'weighted_step_up' => 67,
        'suitcase_squats' => 68,
        'sumo_squat' => 69,
        'sumo_squat_slide_in' => 70,
        'weighted_sumo_squat_slide_in' => 71,
        'sumo_squat_to_high_pull' => 72,
        'sumo_squat_to_stand' => 73,
        'weighted_sumo_squat_to_stand' => 74,
        'sumo_squat_with_rotation' => 75,
        'weighted_sumo_squat_with_rotation' => 76,
        'swiss_ball_body_weight_wall_squat' => 77,
        'weighted_swiss_ball_wall_squat' => 78,
        'thrusters' => 79,
        'uneven_squat' => 80,
        'weighted_uneven_squat' => 81,
        'waist_slimming_squat' => 82,
        'wall_ball' => 83,
        'wide_stance_barbell_squat' => 84,
        'wide_stance_goblet_squat' => 85,
        'zercher_squat' => 86,
        'kbs_overhead' => 87, # Deprecated do not use
        'squat_and_side_kick' => 88,
        'squat_jumps_in_n_out' => 89,
        'pilates_plie_squats_parallel_turned_out_flat_and_heels' => 90,
        'releve_straight_leg_and_knee_bent_with_one_leg_variation' => 91,
    },

    'total_body_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'burpee' => 0,
        'weighted_burpee' => 1,
        'burpee_box_jump' => 2,
        'weighted_burpee_box_jump' => 3,
        'high_pull_burpee' => 4,
        'man_makers' => 5,
        'one_arm_burpee' => 6,
        'squat_thrusts' => 7,
        'weighted_squat_thrusts' => 8,
        'squat_plank_push_up' => 9,
        'weighted_squat_plank_push_up' => 10,
        'standing_t_rotation_balance' => 11,
        'weighted_standing_t_rotation_balance' => 12,
    },

    'triceps_extension_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'bench_dip' => 0,
        'weighted_bench_dip' => 1,
        'body_weight_dip' => 2,
        'cable_kickback' => 3,
        'cable_lying_triceps_extension' => 4,
        'cable_overhead_triceps_extension' => 5,
        'dumbbell_kickback' => 6,
        'dumbbell_lying_triceps_extension' => 7,
        'ez_bar_overhead_triceps_extension' => 8,
        'incline_dip' => 9,
        'weighted_incline_dip' => 10,
        'incline_ez_bar_lying_triceps_extension' => 11,
        'lying_dumbbell_pullover_to_extension' => 12,
        'lying_ez_bar_triceps_extension' => 13,
        'lying_triceps_extension_to_close_grip_bench_press' => 14,
        'overhead_dumbbell_triceps_extension' => 15,
        'reclining_triceps_press' => 16,
        'reverse_grip_pressdown' => 17,
        'reverse_grip_triceps_pressdown' => 18,
        'rope_pressdown' => 19,
        'seated_barbell_overhead_triceps_extension' => 20,
        'seated_dumbbell_overhead_triceps_extension' => 21,
        'seated_ez_bar_overhead_triceps_extension' => 22,
        'seated_single_arm_overhead_dumbbell_extension' => 23,
        'single_arm_dumbbell_overhead_triceps_extension' => 24,
        'single_dumbbell_seated_overhead_triceps_extension' => 25,
        'single_leg_bench_dip_and_kick' => 26,
        'weighted_single_leg_bench_dip_and_kick' => 27,
        'single_leg_dip' => 28,
        'weighted_single_leg_dip' => 29,
        'static_lying_triceps_extension' => 30,
        'suspended_dip' => 31,
        'weighted_suspended_dip' => 32,
        'swiss_ball_dumbbell_lying_triceps_extension' => 33,
        'swiss_ball_ez_bar_lying_triceps_extension' => 34,
        'swiss_ball_ez_bar_overhead_triceps_extension' => 35,
        'tabletop_dip' => 36,
        'weighted_tabletop_dip' => 37,
        'triceps_extension_on_floor' => 38,
        'triceps_pressdown' => 39,
        'weighted_dip' => 40,
    },

    'warm_up_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'quadruped_rocking' => 0,
        'neck_tilts' => 1,
        'ankle_circles' => 2,
        'ankle_dorsiflexion_with_band' => 3,
        'ankle_internal_rotation' => 4,
        'arm_circles' => 5,
        'bent_over_reach_to_sky' => 6,
        'cat_camel' => 7,
        'elbow_to_foot_lunge' => 8,
        'forward_and_backward_leg_swings' => 9,
        'groiners' => 10,
        'inverted_hamstring_stretch' => 11,
        'lateral_duck_under' => 12,
        'neck_rotations' => 13,
        'opposite_arm_and_leg_balance' => 14,
        'reach_roll_and_lift' => 15,
        'scorpion' => 16, # Deprecated do not use
        'shoulder_circles' => 17,
        'side_to_side_leg_swings' => 18,
        'sleeper_stretch' => 19,
        'slide_out' => 20,
        'swiss_ball_hip_crossover' => 21,
        'swiss_ball_reach_roll_and_lift' => 22,
        'swiss_ball_windshield_wipers' => 23,
        'thoracic_rotation' => 24,
        'walking_high_kicks' => 25,
        'walking_high_knees' => 26,
        'walking_knee_hugs' => 27,
        'walking_leg_cradles' => 28,
        'walkout' => 29,
        'walkout_from_push_up_position' => 30,
    },

    'run_exercise_name' => +{
        '_base_type' => FIT_UINT16,
        'run' => 0,
        'walk' => 1,
        'jog' => 2,
        'sprint' => 3,
    },

    'water_type' => +{
        '_base_type' => FIT_ENUM,
        'fresh' => 0,
        'salt' => 1,
        'en13319' => 2,
        'custom' => 3,
    },

    'tissue_model_type' => +{
        '_base_type' => FIT_ENUM,
        'zhl_16c' => 0, # Buhlmann's decompression algorithm, version C
    },

    'dive_gas_status' => +{
        '_base_type' => FIT_ENUM,
        'disabled' => 0,
        'enabled' => 1,
        'backup_only' => 2,
    },

    'dive_alert' => +{
        '_base_type' => FIT_ENUM,
        'ndl_reached' => 0,
        'gas_switch_prompted' => 1,
        'near_surface' => 2,
        'approaching_ndl' => 3,
        'po2_warn' => 4,
        'po2_crit_high' => 5,
        'po2_crit_low' => 6,
        'time_alert' => 7,
        'depth_alert' => 8,
        'deco_ceiling_broken' => 9,
        'deco_complete' => 10,
        'safety_stop_broken' => 11,
        'safety_stop_complete' => 12,
        'cns_warning' => 13,
        'cns_critical' => 14,
        'otu_warning' => 15,
        'otu_critical' => 16,
        'ascent_critical' => 17,
        'alert_dismissed_by_key' => 18,
        'alert_dismissed_by_timeout' => 19,
        'battery_low' => 20,
        'battery_critical' => 21,
        'safety_stop_started' => 22,
        'approaching_first_deco_stop' => 23,
        'setpoint_switch_auto_low' => 24,
        'setpoint_switch_auto_high' => 25,
        'setpoint_switch_manual_low' => 26,
        'setpoint_switch_manual_high' => 27,
        'auto_setpoint_switch_ignored' => 28,
        'switched_to_open_circuit' => 29,
        'switched_to_closed_circuit' => 30,
        'tank_battery_low' => 32,
        'po2_ccr_dil_low' => 33,            # ccr diluent has low po2
        'deco_stop_cleared' => 34,          # a deco stop has been cleared
        'apnea_neutral_buoyancy' => 35,     # Target Depth Apnea Alarm triggered
        'apnea_target_depth' => 36,         # Neutral Buoyance Apnea Alarm triggered
        'apnea_surface' => 37,              # Surface Apnea Alarm triggered
        'apnea_high_speed' => 38,           # High Speed Apnea Alarm triggered
        'apnea_low_speed' => 39,            # Low Speed Apnea Alarm triggered
    },

    'dive_alarm_type' => +{
        '_base_type' => FIT_ENUM,
        'depth' => 0,
        'time' => 1,
        'speed' => 2,       # Alarm when a certain ascent or descent rate is exceeded
    },

    'dive_backlight_mode' => +{
        '_base_type' => FIT_ENUM,
        'at_depth' => 0,
        'always_on' => 1,
    },

    'sleep_level' => +{
        '_base_type' => FIT_ENUM,
        'unmeasurable' => 0,
        'awake' => 1,
        'light' => 2,
        'deep' => 3,
        'rem' => 4,
        },

    'spo2_measurement_type' => +{
        '_base_type' => FIT_ENUM,
        'off_wrist' => 0,
        'spot_check' => 1,
        'continuous_check' => 2,
        'periodic' => 3,
        },

    'ccr_setpoint_switch_mode' => +{
        '_base_type' => FIT_ENUM,
        'manual' => 0, # User switches setpoints manually
        'automatic' => 1, # Switch automatically based on depth
    },

    'dive_gas_mode' => +{
        '_base_type' => FIT_ENUM,
        'open_circuit' => 0,
        'closed_circuit_diluent' => 1,
    },

    'projectile_type' => +{
        '_base_type' => FIT_ENUM,
        'arrow' => 0,               # Arrow projectile type
        'rifle_cartridge' => 1,     # Rifle cartridge projectile type
        'pistol_cartridge' => 2,    # Pistol cartridge projectile type
        'shotshell' => 3,           # Shotshell projectile type
        'air_rifle_pellet' => 4,    # Air rifle pellet projectile type
        'other' => 5,               # Other projectile type
    },

    'favero_product' => +{
        '_base_type' => FIT_UINT16,
        'assioma_uno' => 10,
        'assioma_duo' => 12,
    },

    'split_type' => +{
        '_base_type' => FIT_ENUM,
        'ascent_split' => 1,
        'descent_split' => 2,
        'interval_active' => 3,
        'interval_rest' => 4,
        'interval_warmup' => 5,
        'interval_cooldown' => 6,
        'interval_recovery' => 7,
        'interval_other' => 8,
        'climb_active' => 9,
        'climb_rest' => 10,
        'surf_active' => 11,
        'run_active' => 12,
        'run_rest' => 13,
        'workout_round' => 14,
        'rwd_run' => 17,            # run/walk detection running
        'rwd_walk' => 18,           # run/walk detection walking
        'windsurf_active' => 21,
        'rwd_stand' => 22,          # run/walk detection standing
        'transition' => 23,         # Marks the time going from ascent_split to descent_split/used in backcountry ski
        'ski_lift_split' => 28,
        'ski_run_split' => 29,
    },

    'climb_pro_event' => +{
        '_base_type' => FIT_ENUM,
        'approach' => 0,
        'start' => 1,
        'complete' => 2,
    },

    'gas_consumption_rate_type' => +{
        '_base_type' => FIT_ENUM,
        'pressure_sac' => 0,    # Pressure-based Surface Air Consumption
        'volume_sac' => 1,      # Volumetric Surface Air Consumption
        'rmv' => 2,             # Respiratory Minute Volume
    },

    'tap_sensitivity' => +{
        '_base_type' => FIT_ENUM,
        'high' => 0,
        'medium' => 1,
        'low' => 2,
    },

    'radar_threat_level_type' => +{
        '_base_type' => FIT_ENUM,
        'threat_unknown' => 0,
        'threat_none' => 1,
        'threat_approaching' => 2,
        'threat_approaching_fast' => 3,
    },

    'max_met_speed_source' => +{
        '_base_type' => FIT_ENUM,
        'onboard_gps' => 0,
        'connected_gps' => 1,
        'cadence' => 2,
    },

    'max_met_heart_rate_source' => +{
        '_base_type' => FIT_ENUM,
        'whr' => 0,             # Wrist Heart Rate Monitor
        'hrm' => 1,             # Chest Strap Heart Rate Monitor
    },

    'hrv_status' => +{
        '_base_type' => FIT_ENUM,
        'none' => 0,
        'poor' => 1,
        'low' => 2,
        'unbalanced' => 3,
        'balanced' => 4,
    },

    'no_fly_time_mode' => +{
        '_base_type' => FIT_ENUM,
        'standard' => 0,        # Standard Diver Alert Network no-fly guidance
        'flat_24_hours' => 1,   # Flat 24 hour no-fly guidance
    },

    );

for my $typenam (keys %named_type) {        # if a type was _moved_to, copy the new href to $named_type{$typenam}
    my $typedesc = $named_type{$typenam};
    if (defined $typedesc->{_moved_to} and $typedesc->{_moved_to} ne '') {
        if ($typenam ne 'device_type') { $DB::single=1 }            # want to know if it applies to others
        my $to = $named_type{$typedesc->{_moved_to}};
        $named_type{$typenam} = {%$to} if ref $to eq 'HASH'
    }
}
while (my ($typenam, $typedesc) = each %named_type) {
    # copy and flip key/value pairs of all hrefs in %named_type (except _base_type, _mask, …)
    for my $name (grep {!/^_/} keys %$typedesc) {
        $typedesc->{$typedesc->{$name}} = $name
    }
}

my %msgtype_by_name = (
    'file_id' => +{                     # begins === Common messages === section
        0 => +{'name' => 'type', 'type_name' => 'file'},
        1 => +{'name' => 'manufacturer', 'type_name' => 'manufacturer'},

        2 => +{
            'name' => 'product',

            'switch' => +{
                '_by' => 'manufacturer',
                'garmin' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'dynastream' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'dynastream_oem' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'favero_electronics' => +{'name' => 'favero_product', 'type_name' => 'favero_product'},
                'tacx' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
            },
        },

        3 => +{'name' => 'serial_number'},
        4 => +{'name' => 'time_created', 'type_name' => 'date_time'},
        5 => +{'name' => 'number'},
        7 => +{'name' => 'unknown7'}, # unknown UINT32
        8 => +{'name' => 'product_name'},
    },

    'file_creator' => +{
        0 => +{'name' => 'software_version'},
        1 => +{'name' => 'hardware_version'},
    },

    'timestamp_correlation' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'fractional_timestamp', 'scale' => 32768, 'unit' => 's'},
        1 => +{'name' => 'system_timestamp', 'type_name' => 'date_time'},
        2 => +{'name' => 'fractional_system_timestamp', 'scale' => 32768, 'unit' => 's'},
        3 => +{'name' => 'local_timestamp', 'type_name' => 'local_date_time'},
        4 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        5 => +{'name' => 'system_timestamp_ms', 'unit' => 'ms'},
    },

    'software' => +{                    # begins === Device file messages === section
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        3 => +{'name' => 'version', 'scale' => 100},
        5 => +{'name' => 'part_number'},
    },

    'slave_device' => +{
        0 => +{'name' => 'manufacturer', 'type_name' => 'manufacturer'},

        1 => +{
            'name' => 'product',

            'switch' => +{
                '_by' => 'manufacturer',
                'garmin' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'dynastream' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'dynastream_oem' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'favero_electronics' => +{'name' => 'favero_product', 'type_name' => 'favero_product'},
                'tacx' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
            },
        },
    },

    'capabilities' => +{
        0 => +{'name' => 'languages'},
        1 => +{'name' => 'sports', 'type_name' => 'sport_bits_0'},
        21 => +{'name' => 'workouts_supported', 'type_name' => 'workout_capabilities'},
        22 => +{'name' => 'unknown22'}, # unknown ENUM
        23 => +{'name' => 'connectivity_supported', 'type_name' => 'connectivity_capabilities'},
        24 => +{'name' => 'unknown24'}, # unknown ENUM
        25 => +{'name' => 'unknown25'}, # unknown UINT32Z
    },

    'file_capabilities' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'type', 'type_name' => 'file'},
        1 => +{'name' => 'flags', 'type_name' => 'file_flags'},
        2 => +{'name' => 'directory'},
        3 => +{'name' => 'max_count'},
        4 => +{'name' => 'max_size', 'unit' => 'bytes'},
    },

    'mesg_capabilities' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'file', 'type_name' => 'file'},
        1 => +{'name' => 'mesg_num', 'type_name' => 'mesg_num'},
        2 => +{'name' => 'count_type', 'type_name' => 'mesg_count'},

        3 => +{
            'name' => 'count',

            'switch' => +{
                '_by' => 'count_type',
                'num_per_file' => +{'name' => 'num_per_file'},
                'max_per_file' => +{'name' => 'max_per_file'},
                'max_per_file_type' => +{'name' => 'max_per_file_type'},
            },
        },
    },

    'field_capabilities' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'file', 'type_name' => 'file'},
        1 => +{'name' => 'mesg_num', 'type_name' => 'mesg_num'},
        2 => +{'name' => 'field_num'},
        3 => +{'name' => 'count'},
        4 => +{'name' => 'bits'}, # not present? PATJOL: I don't see this one in the profile
    },

    'device_settings' => +{             # begins === Settings file messages === section
        0 => +{'name' => 'active_time_zone'},
        1 => +{'name' => 'utc_offset'},
        2 => +{'name' => 'time_offset', 'unit' => 's'},
        3 => +{'name' => 'unknown3'}, # unknown ENUM
        4 => +{'name' => 'time_mode', 'type_name' => 'time_mode'},
        5 => +{'name' => 'time_zone_offset', 'scale' => 4, 'unit' => 'hr'},
        10 => +{'name' => 'unknown10'}, # unknown ENUM
        11 => +{'name' => 'unknown11'}, # unknown ENUM
        12 => +{'name' => 'backlight_mode', 'type_name' => 'backlight_mode'},
        13 => +{'name' => 'unknown13'}, # unknown UINT8
        14 => +{'name' => 'unknown14'}, # unknown UINT8
        15 => +{'name' => 'unknown15'}, # unknown UINT8
        16 => +{'name' => 'unknown16'}, # unknown ENUM
        17 => +{'name' => 'unknown17'}, # unknown ENUM
        18 => +{'name' => 'unknown18'}, # unknown ENUM
        21 => +{'name' => 'unknown21'}, # unknown ENUM
        22 => +{'name' => 'unknown22'}, # unknown ENUM
        26 => +{'name' => 'unknown26'}, # unknown ENUM
        27 => +{'name' => 'unknown27'}, # unknown ENUM
        29 => +{'name' => 'unknown29'}, # unknown ENUM
        33 => +{'name' => 'unknown33'}, # unknown UNIT8
        36 => +{'name' => 'activity_tracker_enabled', 'type_name' => 'bool'},
        38 => +{'name' => 'unknown38'}, # unknown ENUM
        39 => +{'name' => 'clock_time', 'type_name' => 'date_time'},
        40 => +{'name' => 'pages_enabled'},
        41 => +{'name' => 'unknown41'}, # unknown ENUM
        46 => +{'name' => 'move_alert_enabled', 'type_name' => 'bool'},
        47 => +{'name' => 'date_mode', 'type_name' => 'date_mode'},
        48 => +{'name' => 'unknown48'}, # unknown ENUM
        49 => +{'name' => 'unknown49'}, # unknown UINT16
        52 => +{'name' => 'unknown52'}, # unknown ENUM
        53 => +{'name' => 'unknown53'}, # unknown ENUM
        54 => +{'name' => 'unknown54'}, # unknown ENUM
        55 => +{'name' => 'display_orientation', 'type_name' => 'display_orientation'},
        56 => +{'name' => 'mounting_side', 'type_name' => 'side'},
        57 => +{'name' => 'default_page'},
        58 => +{'name' => 'autosync_min_steps', 'unit' => 'steps'},
        59 => +{'name' => 'autosync_min_time', 'unit' => 'minutes'},
        75 => +{'name' => 'unknown75'}, # unknown ENUM
        80 => +{'name' => 'lactate_threshold_autodetect_enabled', 'type_name' => 'bool'},
        85 => +{'name' => 'unknown85'}, # unknown ENUM
        86 => +{'name' => 'ble_auto_upload_enabled', 'type_name' => 'bool'},
        89 => +{'name' => 'auto_sync_frequency', 'type_name' => 'auto_sync_frequency'},
        90 => +{'name' => 'auto_activity_detect', 'type_name' => 'auto_activity_detect'},
        94 => +{'name' => 'number_of_screens'},
        95 => +{'name' => 'smart_notification_display_orientation', 'type_name' => 'display_orientation'},
        97 => +{'name' => 'unknown97'}, # unknown UINT8Z
        98 => +{'name' => 'unknown98'}, # unknown ENUM
        103 => +{'name' => 'unknown103'}, # unknown ENUM
        134 => +{'name' => 'tap_interface', 'type_name' => 'switch'},
        174 => +{'name' => 'tap_sensitivity', 'type_name' => 'tap_sensitivity'},
    },

    'user_profile' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'friendly_name'},  # Used for Morning Report greeting
        1 => +{'name' => 'gender', 'type_name' => 'gender'},
        2 => +{'name' => 'age', 'unit' => 'years'},
        3 => +{'name' => 'height', scale => 100, 'unit' => 'm'},
        4 => +{'name' => 'weight', scale => 10, 'unit' => 'kg'},
        5 => +{'name' => 'language', 'type_name' => 'language'},
        6 => +{'name' => 'elev_setting', 'type_name' => 'display_measure'},
        7 => +{'name' => 'weight_setting', 'type_name' => 'display_measure'},
        8 => +{'name' => 'resting_heart_rate', 'unit' => 'bpm'},
        9 => +{'name' => 'default_max_running_heart_rate', 'unit' => 'bpm'},
        10 => +{'name' => 'default_max_biking_heart_rate', 'unit' => 'bpm'},
        11 => +{'name' => 'default_max_heart_rate', 'unit' => 'bpm'},
        12 => +{'name' => 'hr_setting', 'type_name' => 'display_heart'},
        13 => +{'name' => 'speed_setting', 'type_name' => 'display_measure'},
        14 => +{'name' => 'dist_setting', 'type_name' => 'display_measure'},
        16 => +{'name' => 'power_setting', 'type_name' => 'display_power'},
        17 => +{'name' => 'activity_class', 'type_name' => 'activity_class'},
        18 => +{'name' => 'position_setting', 'type_name' => 'display_position'},
        21 => +{'name' => 'temperature_setting', 'type_name' => 'display_measure'},
        22 => +{'name' => 'local_id', 'type_name' => 'user_local_id'},
        23 => +{'name' => 'global_id'},
        24 => +{'name' => 'unknown24'}, # unknown UINT8
        28 => +{'name' => 'wake_time', 'type_name' => 'localtime_into_day'},
        29 => +{'name' => 'sleep_time', 'type_name' => 'localtime_into_day'},
        30 => +{'name' => 'height_setting', 'type_name' => 'display_measure'},
        31 => +{'name' => 'user_running_step_length', scale => 1000, 'unit' => 'm'},
        32 => +{'name' => 'user_walking_step_length', scale => 1000, 'unit' => 'm'},
        33 => +{'name' => 'unknown33'}, # unknown UINT16
        34 => +{'name' => 'unknown34'}, # unknown UINT16
        35 => +{'name' => 'unknown35'}, # unknown UINT32
        36 => +{'name' => 'unknown36'}, # unknown UINT8
        38 => +{'name' => 'unknown38'}, # unknown UINT16
        40 => +{'name' => 'unknown40'}, # unknown FLOAT32
        42 => +{'name' => 'unknown42'}, # unknown UINT32
        47 => +{'name' => 'depth_setting', 'type_name' => 'display_measure'},
        49 => +{'name' => 'dive_count'},
    },

    'hrm_profile' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'enabled', 'type_name' => 'bool'},
        1 => +{'name' => 'hrm_ant_id'},
        2 => +{'name' => 'log_hrv', 'type_name' => 'bool'},
        3 => +{'name' => 'hrm_ant_id_trans_type'},
    },

    'sdm_profile' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'enabled', 'type_name' => 'bool'},
        1 => +{'name' => 'sdm_ant_id'},
        2 => +{'name' => 'sdm_cal_factor', 'scale' => 10, 'unit' => '%'},
        3 => +{'name' => 'odometer', 'scale' => 100, 'unit' => 'm'},
        4 => +{'name' => 'speed_source', 'type_name' => 'bool'},
        5 => +{'name' => 'sdm_ant_id_trans_type'},
        7 => +{'name' => 'odometer_rollover'},
    },

    'bike_profile' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'name'},
        1 => +{'name' => 'sport', 'type_name' => 'sport'},
        2 => +{'name' => 'sub_sport', 'type_name' => 'sub_sport'},
        3 => +{'name' => 'odometer', 'scale' => 100, 'unit' => 'm'},
        4 => +{'name' => 'bike_spd_ant_id'},
        5 => +{'name' => 'bike_cad_ant_id'},
        6 => +{'name' => 'bike_spdcad_ant_id'},
        7 => +{'name' => 'bike_power_ant_id'},
        8 => +{'name' => 'custom_wheelsize', 'scale' => 1000, 'unit' => 'm'},
        9 => +{'name' => 'auto_wheelsize', 'scale' => 1000, 'unit' => 'm'},
        10 => +{'name' => 'bike_weight', 'scale' => 10, 'unit' => 'kg'},
        11 => +{'name' => 'power_cal_factor', 'scale' => 10, 'unit' => '%'},
        12 => +{'name' => 'auto_wheel_cal', 'type_name' => 'bool'},
        13 => +{'name' => 'auto_power_zero', 'type_name' => 'bool'},
        14 => +{'name' => 'id'},
        15 => +{'name' => 'spd_enabled', 'type_name' => 'bool'},
        16 => +{'name' => 'cad_enabled', 'type_name' => 'bool'},
        17 => +{'name' => 'spdcad_enabled', 'type_name' => 'bool'},
        18 => +{'name' => 'power_enabled', 'type_name' => 'bool'},
        19 => +{'name' => 'crank_length', 'scale' => 2, 'offset' => -110, 'unit' => 'mm'},
        20 => +{'name' => 'enabled', 'type_name' => 'bool'},
        21 => +{'name' => 'bike_spd_ant_id_trans_type'},
        22 => +{'name' => 'bike_cad_ant_id_trans_type'},
        23 => +{'name' => 'bike_spdcad_ant_id_trans_type'},
        24 => +{'name' => 'bike_power_ant_id_trans_type'},
        35 => +{'name' => 'unknown35'}, # unknown UINT8 (array[3])
        36 => +{'name' => 'unknown36'}, # unknown ENUM
        37 => +{'name' => 'odometer_rollover'},
        38 => +{'name' => 'front_gear_num'},
        39 => +{'name' => 'front_gear'},
        40 => +{'name' => 'rear_gear_num'},
        41 => +{'name' => 'rear_gear'},
        44 => +{'name' => 'shimano_di2_enabled'},
    },

    'connectivity' => +{
        0 => +{'name' => 'bluetooth_enabled', 'type_name' => 'bool'},
        1 => +{'name' => 'bluetooth_le_enabled', 'type_name' => 'bool'},
        2 => +{'name' => 'ant_enabled', 'type_name' => 'bool'},
        3 => +{'name' => 'name'},
        4 => +{'name' => 'live_tracking_enabled', 'type_name' => 'bool'},
        5 => +{'name' => 'weather_conditions_enabled', 'type_name' => 'bool'},
        6 => +{'name' => 'weather_alerts_enabled', 'type_name' => 'bool'},
        7 => +{'name' => 'auto_activity_upload_enabled', 'type_name' => 'bool'},
        8 => +{'name' => 'course_download_enabled', 'type_name' => 'bool'},
        9 => +{'name' => 'workout_download_enabled', 'type_name' => 'bool'},
        10 => +{'name' => 'gps_ephemeris_download_enabled', 'type_name' => 'bool'},
        11 => +{'name' => 'incident_detection_enabled', 'type_name' => 'bool'},
        12 => +{'name' => 'grouptrack_enabled', 'type_name' => 'bool'},
    },

    'watchface_settings' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'mode', 'type_name' => 'watchface_mode'},

        1 => +{
            'name' => 'layout',

            'switch' => +{
                '_by' => 'mode',
                'digital' => +{'name' => 'digital_layout', 'type_name' => 'digital_watchface_layout'},
                'analog' => +{'name' => 'analog_layout', 'type_name' => 'analog_watchface_layout'},
            },
        },
    },

    'ohr_settings' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'enabled', 'type_name' => 'switch'},
    },

    'time_in_zone' => +{
        253 => +{ 'name' => 'timestamp', 'type_name' => 'date_time' },
        0  => +{ 'name' => 'reference_mesg',             'type_name' => 'mesg_num' },
        1  => +{ 'name' => 'reference_index',            'type_name' => 'message_index' },
        2  => +{ 'name' => 'time_in_hr_zone',            'scale' => 1000 },
        3  => +{ 'name' => 'time_in_speed_zone',         'scale' => 1000 },
        4  => +{ 'name' => 'time_in_cadence_zone',       'scale' => 1000 },
        5  => +{ 'name' => 'time_in_power_zone',         'scale' => 1000 },
        6  => +{ 'name' => 'hr_zone_high_boundary',      'unit'  => 'bpm' },
        7  => +{ 'name' => 'speed_zone_high_boundary',   'unit'  => 'm/s', 'scale' => 1000 },
        8  => +{ 'name' => 'cadence_zone_high_boundary', 'unit'  => 'rpm' },
        9  => +{ 'name' => 'power_zone_high_boundary',   'unit'  => 'watts' },
        10 => +{ 'name' => 'hr_calc_type',               'type_name' => 'hr_zone_calc' },
        11 => +{ 'name' => 'max_heart_rate' },
        12 => +{ 'name' => 'resting_heart_rate' },
        13 => +{ 'name' => 'threshold_heart_rate' },
        14 => +{ 'name' => 'pwr_calc_type',              'type_name' => 'pwr_zone_calc' },
        15 => +{ 'name' => 'functional_threshold_power' },
    },

    'zones_target' => +{                # begins === Sport settings file messages === section
        1 => +{'name' => 'max_heart_rate', 'unit' => 'bpm'},
        2 => +{'name' => 'threshold_heart_rate', 'unit' => 'bpm'},
        3 => +{'name' => 'functional_threshold_power', 'unit' => 'watts'},
        5 => +{'name' => 'hr_calc_type', 'type_name' => 'hr_zone_calc'},
        7 => +{'name' => 'pwr_calc_type', 'type_name' => 'power_zone_calc'},
        8 => +{'name' => 'unknown8'}, # unknown UINT16
        9 => +{'name' => 'unknown9'}, # unknown ENUM
        10 => +{'name' => 'unknown10'}, # unknown ENUM
        11 => +{'name' => 'unknown11'}, # unknown ENUM
        12 => +{'name' => 'unknown12'}, # unknown ENUM
        13 => +{'name' => 'unknown13'}, # unknown ENUM
    },

    'sport' => +{
        0 => +{'name' => 'sport', 'type_name' => 'sport'},
        1 => +{'name' => 'sub_sport', 'type_name' => 'sub_sport'},
        3 => +{'name' => 'name'},
        4 => +{'name' => 'unknown4'}, # unknown UINT16
        5 => +{'name' => 'unknown5'}, # unknown ENUM
        6 => +{'name' => 'unknown6'}, # unknown ENUM
        7 => +{'name' => 'unknown7'}, # unknown UINT8
        8 => +{'name' => 'unknown8'}, # unknown UINT8
        9 => +{'name' => 'unknown9'}, # unknown UINT8
        10 => +{'name' => 'unknown10'}, # unknown UINT8 (array[3])
        12 => +{'name' => 'unknown12'}, # unknown UINT8
    },

    'hr_zone' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        1 => +{'name' => 'high_bpm', 'unit' => 'bpm'},
        2 => +{'name' => 'name'},
    },

    'speed_zone' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'high_value', 'scale' => 1000, 'unit' => 'm/s'},
        1 => +{'name' => 'name'},
    },

    'cadence_zone' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'high_value', 'unit' => 'rpm'},
        1 => +{'name' => 'name'},
    },

    'power_zone' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        1 => +{'name' => 'high_value', 'unit' => 'watts'},
        2 => +{'name' => 'name'},
    },

    'met_zone' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        1 => +{'name' => 'high_bpm', 'unit' => 'bpm'},
        2 => +{'name' => 'calories', 'scale' => 10, 'unit' => 'kcal/min'},
        3 => +{'name' => 'fat_calories', 'scale' => 10, 'unit' => 'kcal/min'},
    },

    'dive_settings' => +{
        253 => +{'name' => 'timestamp',     'type_name' => 'date_time'},
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 =>  +{'name' => 'name'},
        1 =>  +{'name' => 'model', 'type_name' => 'tissue_model_type'},
        2 =>  +{'name' => 'gf_low',  'unit' => '%'},
        3 =>  +{'name' => 'gf_high', 'unit' => '%'},
        4 =>  +{'name' => 'water_type', 'type_name' => 'water_type'},
        5 =>  +{'name' => 'water_density', 'unit' => 'kg/m^3'},
        6 =>  +{'name' => 'po2_warn',  'scale' => 100, 'unit' => '%'},
        7 =>  +{'name' => 'po2_critical', 'scale' => 100, 'unit' => '%'},
        8 =>  +{'name' => 'po2_deco', 'scale' => 100, 'unit' => '%'},
        9 =>  +{'name' => 'safety_stop_enabled', 'type_name' => 'bool'},
        10 => +{'name' => 'bottom_depth'},
        11 => +{'name' => 'bottom_time'},
        12 => +{'name' => 'apnea_countdown_enabled', 'type_name' => 'bool'},
        13 => +{'name' => 'apnea_countdown_time'},
        14 => +{'name' => 'backlight_mode', 'type_name' => 'dive_backlight_mode'},
        15 => +{'name' => 'backlight_brightness'},
        16 => +{'name' => 'backlight_timeout', 'type_name' => 'backlight_timeout'},
        17 => +{'name' => 'repeat_dive_interval', 'unit' => 's'},
        18 => +{'name' => 'safety_stop_time', 'unit' => 's'},
        19 => +{'name' => 'heart_rate_source_type', 'type_name' => 'source_type'},
        20 => +{
            'name' => 'heart_rate_source',
            'switch' => +{
                '_by' => 'heart_rate_source_type',
                'antplus' => +{'name' => 'heart_rate_antplus_device_type', 'type_name' => 'antplus_device_type'},
                'local' => +{'name' => 'heart_rate_local_device_type', 'type_name' => 'local_device_type'},
            },
        },
        21 => +{ 'name' => 'travel_gas', 'type_name' => 'message_index' },                          # Index of travel dive_gas message
        22 => +{ 'name' => 'ccr_low_setpoint_switch_mode', 'type_name' => 'ccr_setpoint_switch_mode' }, # If low PO2 should be switched to automatically
        23 => +{ 'name' => 'ccr_low_setpoint', 'scale' => 100 },                                    # Target PO2 when using low setpoint
        24 => +{ 'name' => 'ccr_low_setpoint_depth', 'unit' => 'm', 'scale' => 1000 },              # Depth to switch to low setpoint in automatic mode
        25 => +{ 'name' => 'ccr_high_setpoint_switch_mode', 'type' => 'ccr_setpoint_switch_mode' }, # If high PO2 should be switched to automatically
        26 => +{ 'name' => 'ccr_high_setpoint', 'unit' => '%', 'scale' => 100 },                    # Target PO2 when using high setpoint
        27 => +{ 'name' => 'ccr_high_setpoint_depth', 'unit' => 'm', 'scale' => 1000 },             # Depth to switch to high setpoint in automatic mode
        29 => +{ 'name' => 'gas_consumption_display', 'type_name' => 'gas_consumption_rate_type' }, # Type of gas consumption rate to display. Some values are only valid if tank volume is known.
        30 => +{ 'name' => 'up_key_enabled', 'type_name' => 'bool' },                               # Indicates whether the up key is enabled during dives
        35 => +{ 'name' => 'dive_sounds', 'type_name' => 'tone' },                                  # Sounds and vibration enabled or disabled in-dive
        36 => +{ 'name' => 'last_stop_multiple', 'scale' => 10 },                                   # Usually 1.0/1.5/2.0 representing 3/4.5/6m or 10/15/20ft
        37 => +{ 'name' => 'no_fly_time_mode', 'type_name' => 'no_fly_time_mode' },                 # Indicates which guidelines to use for no-fly surface interval.
    },

    'dive_alarm' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'depth', 'scale' => 1000, 'unit' => 'm'},
        1 => +{'name' => 'time', 'unit' => 's'},
        2 => +{'name' => 'enabled', 'type_name' => 'bool'},
        3 => +{'name' => 'alarm_type', 'type_name' => 'dive_alarm_type'},
        4 => +{'name' => 'sound', 'type_name' => 'tone'},
        5 => +{'name' => 'dive_types', 'type_name' => 'sub_sport'},
        6  => +{ 'name' => 'id' },                                          # Alarm ID
        7  => +{ 'name' => 'popup_enabled',      'type_name' => 'bool' },   # Show a visible pop-up for this alarm
        8  => +{ 'name' => 'trigger_on_descent', 'type_name' => 'bool' },   # Trigger the alarm on descent
        9  => +{ 'name' => 'trigger_on_ascent',  'type_name' => 'bool' },   # Trigger the alarm on ascent
        10 => +{ 'name' => 'repeating',          'type_name' => 'bool' },   # Repeat alarm each time threshold is crossed?
        11 => +{ 'name' => 'speed',              'scale' => 1000 },         # Ascent/descent rate (mps) setting for speed type alarms
    },

    'dive_apnea_alarm' => +{
        254 => +{'name' => 'message_index',      'type_name' => 'message_index'},
        0  => +{ 'name' => 'depth',              'unit' => 'm', 'scale' => 1000 },   # Depth setting (m) for depth type alarms
        1  => +{ 'name' => 'time',               'unit' => 's' },                    # Time setting (s) for time type alarms
        2  => +{ 'name' => 'enabled',            'type_name' => 'bool' },            # Enablement flag
        3  => +{ 'name' => 'alarm_type',         'type_name' => 'dive_alarm_type' }, # Alarm type setting
        4  => +{ 'name' => 'sound',              'type_name' => 'tone' },            # Tone and Vibe setting for the alarm.
        5  => +{ 'name' => 'dive_types',         'type_name' => 'sub_sport' },       # Dive types the alarm will trigger on
        6  => +{ 'name' => 'id' },                                                   # Alarm ID
        7  => +{ 'name' => 'popup_enabled',      'type_name' => 'bool' },            # Show a visible pop-up for this alarm
        8  => +{ 'name' => 'trigger_on_descent', 'type_name' => 'bool' },            # Trigger the alarm on descent
        9  => +{ 'name' => 'trigger_on_ascent',  'type_name' => 'bool' },            # Trigger the alarm on ascent
        10 => +{ 'name' => 'repeating',          'type_name' => 'bool' },            # Repeat alarm each time threshold is crossed?
        11 => +{ 'name' => 'speed',              'unit' => 'mps', 'scale' => 1000 }, # Ascent/descent rate (mps) setting for speed type alarms
    },

    'dive_gas' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'helium_content', 'unit' => '%'},
        1 => +{'name' => 'oxygen_content', 'unit' => '%'},
        2 => +{'name' => 'status', 'type_name' => 'dive_gas_status'},
        3 => +{'name' => 'mode',   'type_name' => 'dive_gas_mode'},
    },

    'goal' => +{                        # begins === Goals file messages === section
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'sport', 'type_name' => 'sport'},
        1 => +{'name' => 'sub_sport', 'type_name' => 'sub_sport'},
        2 => +{'name' => 'start_date', 'type_name' => 'date_time'},
        3 => +{'name' => 'end_date', 'type_name' => 'date_time'},
        4 => +{'name' => 'type', 'type_name' => 'goal'},
        5 => +{'name' => 'value'},
        6 => +{'name' => 'repeat', 'type_name' => 'bool'},
        7 => +{'name' => 'target_value'},
        8 => +{'name' => 'recurrence', 'type_name' => 'goal_recurrence'},
        9 => +{'name' => 'recurrence_value'},
        10 => +{'name' => 'enabled', 'type_name' => 'bool'},
        11 => +{'name' => 'source', 'type_name' => 'goal_source'},
    },

    'activity' => +{                    # begins === Activity file messages === section
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'total_timer_time', 'scale' => 1000, 'unit' => 's'},
        1 => +{'name' => 'num_sessions'},
        2 => +{'name' => 'type', 'type_name' => 'activity'},
        3 => +{'name' => 'event', 'type_name' => 'event'},
        4 => +{'name' => 'event_type', 'type_name' => 'event_type'},
        5 => +{'name' => 'local_timestamp', 'type_name' => 'local_date_time'},
        6 => +{'name' => 'event_group'},
    },

    'session' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'event', 'type_name' => 'event'},
        1 => +{'name' => 'event_type', 'type_name' => 'event_type'},
        2 => +{'name' => 'start_time', 'type_name' => 'date_time'},
        3 => +{'name' => 'start_position_lat', 'unit' => 'semicircles'},
        4 => +{'name' => 'start_position_long', 'unit' => 'semicircles'},
        5 => +{'name' => 'sport', 'type_name' => 'sport'},
        6 => +{'name' => 'sub_sport', 'type_name' => 'sub_sport'},
        7 => +{'name' => 'total_elapsed_time', 'scale' => 1000, 'unit' => 's'},
        8 => +{'name' => 'total_timer_time', 'scale' => 1000, 'unit' => 's'},
        9 => +{'name' => 'total_distance', 'scale' => 100, 'unit' => 'm'},

        10 => +{
            'name' => 'total_cycles', 'unit' => 'cycles',

            'switch' => +{
                '_by' => 'sport',
                'walking' => +{'name' => 'total_steps', 'unit' => 'steps'},
                'running' => +{'name' => 'total_strides', 'unit' => 'strides'},
                'swimming' => +{'name' => 'total_strokes', 'unit' => 'strokes'},
            },
        },

        11 => +{'name' => 'total_calories', 'unit' => 'kcal'},
        13 => +{'name' => 'total_fat_calories', 'unit' => 'kcal'},
        14 => +{'name' => 'avg_speed', 'scale' => 1000, 'unit' => 'm/s'},
        15 => +{'name' => 'max_speed', 'scale' => 1000, 'unit' => 'm/s'},
        16 => +{'name' => 'avg_heart_rate', 'unit' => 'bpm'},
        17 => +{'name' => 'max_heart_rate', 'unit' => 'bpm'},

        18 => +{
            'name' => 'avg_cadence', 'unit' => 'rpm',

            'switch' => +{
                '_by' => 'sport',
                'walking' => +{'name' => 'avg_walking_cadence', 'unit' => 'steps/min'},
                'running' => +{'name' => 'avg_running_cadence', 'unit' => 'strides/min'},
                'swimming' => +{'name' => 'avg_swimming_cadence', 'unit' => 'strokes/min'},
            },
        },

        19 => +{
            'name' => 'max_cadence', 'unit' => 'rpm',

            'switch' => +{
                '_by' => 'sport',
                'walking' => +{'name' => 'max_walking_cadence', 'unit' => 'steps/min'},
                'running' => +{'name' => 'max_running_cadence', 'unit' => 'strides/min'},
                'swimming' => +{'name' => 'max_swimming_cadence', 'unit' => 'strokes/min'},
            },
        },

        20 => +{'name' => 'avg_power', 'unit' => 'watts'},
        21 => +{'name' => 'max_power', 'unit' => 'watts'},
        22 => +{'name' => 'total_ascent', 'unit' => 'm'},
        23 => +{'name' => 'total_descent', 'unit' => 'm'},
        24 => +{'name' => 'total_training_effect', 'scale' => 10},
        25 => +{'name' => 'first_lap_index'},
        26 => +{'name' => 'num_laps'},
        27 => +{'name' => 'event_group'},
        28 => +{'name' => 'trigger', 'type_name' => 'session_trigger'},
        29 => +{'name' => 'nec_lat', 'unit' => 'semicircles'},
        30 => +{'name' => 'nec_long', 'unit' => 'semicircles'},
        31 => +{'name' => 'swc_lat', 'unit' => 'semicircles'},
        32 => +{'name' => 'swc_long', 'unit' => 'semicircles'},
        34 => +{'name' => 'normalized_power', 'unit' => 'watts'},
        35 => +{'name' => 'training_stress_score', 'scale' => 10, 'unit' => 'tss'},
        36 => +{'name' => 'intensity_factor', 'scale' => 1000, 'unit' => 'if'},
        37 => +{'name' => 'left_right_balance', 'type_name' => 'left_right_balance_100'},
        38 => +{'name' => 'end_position_lat',  'unit' => 'semicircles'},
        39 => +{'name' => 'end_position_long', 'unit' => 'semicircles'},
        41 => +{'name' => 'avg_stroke_count', 'scale' => 10, 'unit' => 'strokes/lap'},
        42 => +{'name' => 'avg_stroke_distance', 'scale' => 100, 'unit' => 'm'},
        43 => +{'name' => 'swim_stroke', 'type_name' => 'swim_stroke'},
        44 => +{'name' => 'pool_length', 'scale' => 100, 'unit' => 'm'},
        45 => +{'name' => 'threshold_power', 'unit' => 'watts'},
        46 => +{'name' => 'pool_length_unit', 'type_name' => 'display_measure'},
        47 => +{'name' => 'num_active_lengths', 'unit' => 'lengths'},
        48 => +{'name' => 'total_work', 'unit' => 'J'},
        49 => +{'name' => 'avg_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        50 => +{'name' => 'max_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        51 => +{'name' => 'gps_accuracy', 'unit' => 'm'},
        52 => +{'name' => 'avg_grade', 'scale' => 100, 'unit' => '%'},
        53 => +{'name' => 'avg_pos_grade', 'scale' => 100, 'unit' => '%'},
        54 => +{'name' => 'avg_neg_grade', 'scale' => 100, 'unit' => '%'},
        55 => +{'name' => 'max_pos_grade', 'scale' => 100, 'unit' => '%'},
        56 => +{'name' => 'max_neg_grade', 'scale' => 100, 'unit' => '%'},
        57 => +{'name' => 'avg_temperature', 'unit' => 'deg.C'},
        58 => +{'name' => 'max_temperature', 'unit' => 'deg.C'},
        59 => +{'name' => 'total_moving_time', 'scale' => 1000, 'unit' => 's'},
        60 => +{'name' => 'avg_pos_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        61 => +{'name' => 'avg_neg_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        62 => +{'name' => 'max_pos_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        63 => +{'name' => 'max_neg_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        64 => +{'name' => 'min_heart_rate', 'unit' => 'bpm'},
        65 => +{'name' => 'time_in_hr_zone', 'scale' => 1000, 'unit' => 's'},
        66 => +{'name' => 'time_in_speed_zone', 'scale' => 1000, 'unit' => 's'},
        67 => +{'name' => 'time_in_cadence_zone', 'scale' => 1000, 'unit' => 's'},
        68 => +{'name' => 'time_in_power_zone', 'scale' => 1000, 'unit' => 's'},
        69 => +{'name' => 'avg_lap_time', 'scale' => 1000, 'unit' => 's'},
        70 => +{'name' => 'best_lap_index'},
        71 => +{'name' => 'min_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        78 => +{'name' => 'unknown78'}, # unknown UINT32
        81 => +{'name' => 'unknown81'}, # unknown ENUM
        82 => +{'name' => 'player_score'},
        83 => +{'name' => 'opponent_score'},
        84 => +{'name' => 'opponent_name'},
        85 => +{'name' => 'stroke_count', 'unit' => 'counts'},
        86 => +{'name' => 'zone_count', 'unit' => 'counts'},
        87 => +{'name' => 'max_ball_speed', 'scale' => 100, 'unit' => 'm/s'},
        88 => +{'name' => 'avg_ball_speed', 'scale' => 100, 'unit' => 'm/s'},
        89 => +{'name' => 'avg_vertical_oscillation', 'scale' => 10, 'unit' => 'mm'},
        90 => +{'name' => 'avg_stance_time_percent', 'scale' => 100, 'unit' => '%'},
        91 => +{'name' => 'avg_stance_time', 'scale' => 10, 'unit' => 'ms'},
        92 => +{'name' => 'avg_fractional_cadence', 'scale' => 128, 'unit' => 'rpm'},
        93 => +{'name' => 'max_fractional_cadence', 'scale' => 128, 'unit' => 'rpm'},
        94 => +{'name' => 'total_fractional_cycles', 'scale' => 128, 'unit' => 'cycles'},
        95 => +{'name' => 'avg_total_hemoglobin_conc', 'scale' => 100, 'unit' => 'g/dL'},
        96 => +{'name' => 'min_total_hemoglobin_conc', 'scale' => 100, 'unit' => 'g/dL'},
        97 => +{'name' => 'max_total_hemoglobin_conc', 'scale' => 100, 'unit' => 'g/dL'},
        98 => +{'name' => 'avg_saturated_hemoglobin_percent', 'scale' => 10, 'unit' => '%'},
        99 => +{'name' => 'min_saturated_hemoglobin_percent', 'scale' => 10, 'unit' => '%'},
        100 => +{'name' => 'max_saturated_hemoglobin_percent', 'scale' => 10, 'unit' => '%'},
        101 => +{'name' => 'avg_left_torque_effectiveness', 'scale' => 2, 'unit' => '%'},
        102 => +{'name' => 'avg_right_torque_effectiveness', 'scale' => 2, 'unit' => '%'},
        103 => +{'name' => 'avg_left_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        104 => +{'name' => 'avg_right_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        105 => +{'name' => 'avg_combined_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        106 => +{'name' => 'unknown106'}, # unknown UINT16
        107 => +{'name' => 'unknown107'}, # unknown UINT16
        108 => +{'name' => 'unknown108'}, # unknown UINT16
        109 => +{'name' => 'unknown109'}, # unknown UINT8
        110 => +{'name' => 'sport_profile_name'},   # Sport name from associated sport mesg
        111 => +{'name' => 'sport_index'},
        112 => +{'name' => 'time_standing', 'scale' => 1000, 'unit' => 's'},
        113 => +{'name' => 'stand_count'},
        114 => +{'name' => 'avg_left_pco', 'unit' => 'mm'},
        115 => +{'name' => 'avg_right_pco', 'unit' => 'mm'},
        116 => +{'name' => 'avg_left_power_phase', 'scale' => 0.7111111, 'unit' => 'degrees'},
        117 => +{'name' => 'avg_left_power_phase_peak', 'scale' => 0.7111111, 'unit' => 'degrees'},
        118 => +{'name' => 'avg_right_power_phase', 'scale' => 0.7111111, 'unit' => 'degrees'},
        119 => +{'name' => 'avg_right_power_phase_peak', 'scale' => 0.7111111, 'unit' => 'degrees'},
        120 => +{'name' => 'avg_power_position', 'unit' => 'watts'},
        121 => +{'name' => 'max_power_position', 'unit' => 'watts'},
        122 => +{'name' => 'avg_cadence_position', 'unit' => 'rpm'},
        123 => +{'name' => 'max_cadence_position', 'unit' => 'rpm'},
        124 => +{'name' => 'enhanced_avg_speed', 'scale' => 1000, 'unit' => 'm/s'},
        125 => +{'name' => 'enhanced_max_speed', 'scale' => 1000, 'unit' => 'm/s'},
        126 => +{'name' => 'enhanced_avg_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        127 => +{'name' => 'enhanced_min_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        128 => +{'name' => 'enhanced_max_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        129 => +{'name' => 'avg_lev_motor_power', 'unit' => 'watts'},
        130 => +{'name' => 'max_lev_motor_power', 'unit' => 'watts'},
        131 => +{'name' => 'lev_battery_consumption', 'scale' => 2, 'unit' => '%'},
        132 => +{'name' => 'avg_vertical_ratio', 'scale' => 100, 'unit' => '%'},
        133 => +{'name' => 'avg_stance_time_balance', 'scale' => 100, 'unit' => '%'},
        134 => +{'name' => 'avg_step_length', 'scale' => 10, 'unit' => 'mm'},
        137 => +{'name' => 'total_anaerobic_training_effect', 'scale' => 10},
        139 => +{'name' => 'avg_vam', 'scale' => 1000, 'unit' => 'm/s'},
        140 => +{ 'name' => 'avg_depth',                     'unit' => 'm', 'scale' => 1000 },   # 0 if above water
        141 => +{ 'name' => 'max_depth',                     'unit' => 'm', 'scale' => 1000 },   # 0 if above water
        142 => +{ 'name' => 'surface_interval',              'unit' => 's' },                    # Time since end of last dive
        143 => +{ 'name' => 'start_cns',                     'unit' => '%' },
        144 => +{ 'name' => 'end_cns',                       'unit' => '%' },
        145 => +{ 'name' => 'start_n2',                      'unit' => '%' },
        146 => +{ 'name' => 'end_n2',                        'unit' => '%' },
        147 => +{ 'name' => 'avg_respiration_rate' },
        148 => +{ 'name' => 'max_respiration_rate' },
        149 => +{ 'name' => 'min_respiration_rate' },
        150 => +{ 'name' => 'min_temperature',               'unit' => 'deg.C' },
        155 => +{ 'name' => 'o2_toxicity',                   'unit' => 'OTUs' },
        156 => +{ 'name' => 'dive_number' },
        168 => +{ 'name' => 'training_load_peak',            'scale' => 65536 },
        169 => +{ 'name' => 'enhanced_avg_respiration_rate', 'unit' => 'breaths/min', 'scale' => 100 },
        170 => +{ 'name' => 'enhanced_max_respiration_rate', 'unit' => 'breaths/min' },
        180 => +{ 'name' => 'enhanced_min_respiration_rate', 'scale' => 100 },
        181 => +{'name' => 'total_grit', 'unit' => 'kGrit'},
        182 => +{'name' => 'total_flow', 'unit' => 'Flow'},
        183 => +{'name' => 'jump_count'},
        186 => +{'name' => 'avg_grit', 'unit' => 'kGrit'},
        187 => +{'name' => 'avg_flow', 'unit' => 'Flow'},
        192 => +{'name' => 'workout_feel'},                     # A 0-100 scale representing how a user felt while performing a workout. Low values are considered feeling bad, while high values are good.
        193 => +{'name' => 'workout_rpe'},                      # Common Borg CR10 / 0-10 RPE scale, multiplied 10x.. Aggregate score for all workouts in a single session.
        194 => +{'name' => 'avg_spo2',   'unit' => 'percent'},  # Average SPO2 for the monitoring session
        195 => +{'name' => 'avg_stress', 'unit' => 'percent'},  # Average stress for the monitoring session
        197 => +{'name' => 'sdrr_hrv',   'unit' => 'mS'},       # Standard deviation of R-R interval (SDRR) - Heart rate variability measure most useful for wellness users.
        198 => +{'name' => 'rmssd_hrv',  'unit' => 'mS'},       # Root mean square successive difference (RMSSD) - Heart rate variability measure most useful for athletes
        199 => +{'name' => 'total_fractional_ascent', 'unit' => 'm'},
        200 => +{'name' => 'total_fractional_descent', 'unit' => 'm'},
        208 => +{'name' => 'avg_core_temperature', 'unit' => 'deg.C'},
        209 => +{'name' => 'min_core_temperature', 'unit' => 'deg.C'},
        210 => +{'name' => 'max_core_temperature', 'unit' => 'deg.C'},
    },

    'lap' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'event', 'type_name' => 'event'},
        1 => +{'name' => 'event_type', 'type_name' => 'event_type'},
        2 => +{'name' => 'start_time', 'type_name' => 'date_time'},
        3 => +{'name' => 'start_position_lat', 'unit' => 'semicircles'},
        4 => +{'name' => 'start_position_long', 'unit' => 'semicircles'},
        5 => +{'name' => 'end_position_lat', 'unit' => 'semicircles'},
        6 => +{'name' => 'end_position_long', 'unit' => 'semicircles'},
        7 => +{'name' => 'total_elapsed_time', 'scale' => 1000, 'unit' => 's'},
        8 => +{'name' => 'total_timer_time', 'scale' => 1000, 'unit' => 's'},
        9 => +{'name' => 'total_distance', 'scale' => 100, 'unit' => 'm'},

        10 => +{
            'name' => 'total_cycles', 'unit' => 'cycles',

            'switch' => +{
                '_by' => 'sport',
                'walking' => +{'name' => 'total_steps', 'unit' => 'steps'},
                'running' => +{'name' => 'total_strides', 'unit' => 'strides'},
                'swimming' => +{'name' => 'total_strokes', 'unit' => 'strokes'},
            },
        },

        11 => +{'name' => 'total_calories', 'unit' => 'kcal'},
        12 => +{'name' => 'total_fat_calories', 'unit' => 'kcal'},
        13 => +{'name' => 'avg_speed', 'scale' => 1000, 'unit' => 'm/s'},
        14 => +{'name' => 'max_speed', 'scale' => 1000, 'unit' => 'm/s'},
        15 => +{'name' => 'avg_heart_rate', 'unit' => 'bpm'},
        16 => +{'name' => 'max_heart_rate', 'unit' => 'bpm'},

        17 => +{
            'name' => 'avg_cadence', 'unit' => 'rpm',

            'switch' => +{
                '_by' => 'sport',
                'walking' => +{'name' => 'avg_walking_cadence', 'unit' => 'steps/min'},
                'running' => +{'name' => 'avg_running_cadence', 'unit' => 'strides/min'},
                'swimming' => +{'name' => 'avg_swimming_cadence', 'unit' => 'strokes/min'},
            },
        },

        18 => +{
            'name' => 'max_cadence', 'unit' => 'rpm',

            'switch' => +{
                '_by' => 'sport',
                'walking' => +{'name' => 'max_walking_cadence', 'unit' => 'steps/min'},
                'running' => +{'name' => 'max_running_cadence', 'unit' => 'strides/min'},
                'swimming' => +{'name' => 'max_swimming_cadence', 'unit' => 'strokes/min'},
            },
        },

        19 => +{'name' => 'avg_power', 'unit' => 'watts'},
        20 => +{'name' => 'max_power', 'unit' => 'watts'},
        21 => +{'name' => 'total_ascent', 'unit' => 'm'},
        22 => +{'name' => 'total_descent', 'unit' => 'm'},
        23 => +{'name' => 'intensity', 'type_name' => 'intensity'},
        24 => +{'name' => 'lap_trigger', 'type_name' => 'lap_trigger'},
        25 => +{'name' => 'sport', 'type_name' => 'sport'},
        26 => +{'name' => 'event_group'},
        27 => +{'name' => 'nec_lat', 'unit' => 'semicircles'}, # not present?
        28 => +{'name' => 'nec_long', 'unit' => 'semicircles'}, # not present?
        29 => +{'name' => 'swc_lat', 'unit' => 'semicircles'}, # not present?
        30 => +{'name' => 'swc_long', 'unit' => 'semicircles'}, # not present?
        32 => +{'name' => 'num_lengths', 'unit' => 'lengths'},
        33 => +{'name' => 'normalized_power', 'unit' => 'watts'},
        34 => +{'name' => 'left_right_balance', 'type_name' => 'left_right_balance_100'},
        35 => +{'name' => 'first_length_index'},
        37 => +{'name' => 'avg_stroke_distance', 'scale' => 100, 'unit' => 'm'},
        38 => +{'name' => 'swim_stroke', 'type_name' => 'swim_stroke'},
        39 => +{'name' => 'sub_sport', 'type_name' => 'sub_sport'},
        40 => +{'name' => 'num_active_lengths', 'unit' => 'lengths'},
        41 => +{'name' => 'total_work', 'unit' => 'J'},
        42 => +{'name' => 'avg_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        43 => +{'name' => 'max_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        44 => +{'name' => 'gps_accuracy', 'unit' => 'm'},
        45 => +{'name' => 'avg_grade', 'scale' => 100, 'unit' => '%'},
        46 => +{'name' => 'avg_pos_grade', 'scale' => 100, 'unit' => '%'},
        47 => +{'name' => 'avg_neg_grade', 'scale' => 100, 'unit' => '%'},
        48 => +{'name' => 'max_pos_grade', 'scale' => 100, 'unit' => '%'},
        49 => +{'name' => 'max_neg_grade', 'scale' => 100, 'unit' => '%'},
        50 => +{'name' => 'avg_temperature', 'unit' => 'deg.C'},
        51 => +{'name' => 'max_temperature', 'unit' => 'deg.C'},
        52 => +{'name' => 'total_moving_time', 'scale' => 1000, 'unit' => 's'},
        53 => +{'name' => 'avg_pos_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        54 => +{'name' => 'avg_neg_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        55 => +{'name' => 'max_pos_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        56 => +{'name' => 'max_neg_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        57 => +{'name' => 'time_in_hr_zone', 'scale' => 1000, 'unit' => 's'},
        58 => +{'name' => 'time_in_speed_zone', 'scale' => 1000, 'unit' => 's'},
        59 => +{'name' => 'time_in_cadence_zone', 'scale' => 1000, 'unit' => 's'},
        60 => +{'name' => 'time_in_power_zone', 'scale' => 1000, 'unit' => 's'},
        61 => +{'name' => 'repetition_num'},
        62 => +{'name' => 'min_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        63 => +{'name' => 'min_heart_rate', 'unit' => 'bpm'},
        70 => +{'name' => 'unknown70'}, # unknown UINT32
        71 => +{'name' => 'wkt_step_index', 'type_name' => 'message_index'},
        72 => +{'name' => 'unknown72'}, # unknown ENUM
        74 => +{'name' => 'opponent_score'},
        75 => +{'name' => 'stroke_count', 'unit' => 'counts'},
        76 => +{'name' => 'zone_count', 'unit' => 'counts'},
        77 => +{'name' => 'avg_vertical_oscillation', 'scale' => 10, 'unit' => 'mm'},
        78 => +{'name' => 'avg_stance_time_percent', 'scale' => 100, 'unit' => '%'},
        79 => +{'name' => 'avg_stance_time', 'scale' => 10, 'unit' => 'ms'},
        80 => +{'name' => 'avg_fractional_cadence', 'scale' => 128, 'unit' => 'rpm'},
        81 => +{'name' => 'max_fractional_cadence', 'scale' => 128, 'unit' => 'rpm'},
        82 => +{'name' => 'total_fractional_cycles', 'scale' => 128, 'unit' => 'cycles'},
        83 => +{'name' => 'player_score'},
        84 => +{'name' => 'avg_total_hemoglobin_conc', 'scale' => 100, 'unit' => 'g/dL'},
        85 => +{'name' => 'min_total_hemoglobin_conc', 'scale' => 100, 'unit' => 'g/dL'},
        86 => +{'name' => 'max_total_hemoglobin_conc', 'scale' => 100, 'unit' => 'g/dL'},
        87 => +{'name' => 'avg_saturated_hemoglobin_percent', 'scale' => 10, 'unit' => '%'},
        88 => +{'name' => 'min_saturated_hemoglobin_percent', 'scale' => 10, 'unit' => '%'},
        89 => +{'name' => 'max_saturated_hemoglobin_percent', 'scale' => 10, 'unit' => '%'},
        91 => +{'name' => 'avg_left_torque_effectiveness', 'scale' => 2, 'unit' => '%'},
        92 => +{'name' => 'avg_right_torque_effectiveness', 'scale' => 2, 'unit' => '%'},
        93 => +{'name' => 'avg_left_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        94 => +{'name' => 'avg_right_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        95 => +{'name' => 'avg_combined_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        96 => +{'name' => 'unknown96'}, # unknown UINT16
        97 => +{'name' => 'unknown97'}, # unknown UINT16
        98 => +{'name' => 'time_standing', 'scale' => 1000, 'unit' => 's'},
        99 => +{'name' => 'stand_count'},
        100 => +{'name' => 'avg_left_pco', 'unit' => 'mm'},
        101 => +{'name' => 'avg_right_pco', 'unit' => 'mm'},
        102 => +{'name' => 'avg_left_power_phase', 'scale' => 0.7111111, 'unit' => 'degrees'},
        103 => +{'name' => 'avg_left_power_phase_peak', 'scale' => 0.7111111, 'unit' => 'degrees'},
        104 => +{'name' => 'avg_right_power_phase', 'scale' => 0.7111111, 'unit' => 'degrees'},
        105 => +{'name' => 'avg_right_power_phase_peak', 'scale' => 0.7111111, 'unit' => 'degrees'},
        106 => +{'name' => 'avg_power_position', 'unit' => 'watts'},
        107 => +{'name' => 'max_power_position', 'unit' => 'watts'},
        108 => +{'name' => 'avg_cadence_position', 'unit' => 'rpm'},
        109 => +{'name' => 'max_cadence_position', 'unit' => 'rpm'},
        110 => +{'name' => 'enhanced_avg_speed', 'scale' => 1000, 'unit' => 'm/s'},
        111 => +{'name' => 'enhanced_max_speed', 'scale' => 1000, 'unit' => 'm/s'},
        112 => +{'name' => 'enhanced_avg_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        113 => +{'name' => 'enhanced_min_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        114 => +{'name' => 'enhanced_max_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        115 => +{'name' => 'avg_lev_motor_power', 'unit' => 'watts'},
        116 => +{'name' => 'max_lev_motor_power', 'unit' => 'watts'},
        117 => +{'name' => 'lev_battery_consumption', 'scale' => 2, 'unit' => '%'},
        118 => +{'name' => 'avg_vertical_ratio', 'scale' => 100, 'unit' => '%'},
        119 => +{'name' => 'avg_stance_time_balance', 'scale' => 100, 'unit' => '%'},
        120 => +{'name' => 'avg_step_length', 'scale' => 10, 'unit' => 'mm'},
        121 => +{'name' => 'avg_vam', 'scale' => 1000, 'unit' => 'm/s'},
        122 => +{ 'name' => 'avg_depth',                     'unit' => 'm', 'scale' => 1000 }, # 0 if above water
        123 => +{ 'name' => 'max_depth',                     'unit' => 'm', 'scale' => 1000 }, # 0 if above water
        124 => +{ 'name' => 'min_temperature',               'unit' => 'deg.C' },
        136 => +{ 'name' => 'enhanced_avg_respiration_rate', 'unit' => 'breaths/min', 'scale' => 100 },
        137 => +{ 'name' => 'enhanced_max_respiration_rate', 'unit' => 'breaths/min', 'scale' => 100 },
        147 => +{ 'name' => 'avg_respiration_rate' },
        148 => +{ 'name' => 'max_respiration_rate' },
        149 => +{'name' => 'total_grit', 'unit' => 'kGrit'},
        150 => +{'name' => 'total_flow', 'unit' => 'Flow'},
        151 => +{'name' => 'jump_count'},
        153 => +{'name' => 'avg_grit', 'unit' => 'kGrit'},
        154 => +{'name' => 'avg_flow', 'unit' => 'Flow'},
        156 => +{'name' => 'total_fractional_ascent', 'unit' => 'm'},
        157 => +{'name' => 'total_fractional_descent', 'unit' => 'm'},
        158 => +{'name' => 'avg_core_temperature', 'unit' => 'deg.C'},
        159 => +{'name' => 'min_core_temperature', 'unit' => 'deg.C'},
        160 => +{'name' => 'max_core_temperature', 'unit' => 'deg.C'},
    },

    'length' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'event', 'type_name' => 'event'},
        1 => +{'name' => 'event_type', 'type_name' => 'event_type'},
        2 => +{'name' => 'start_time', 'type_name' => 'date_time'},
        3 => +{'name' => 'total_elapsed_time', 'scale' => 1000, 'unit' => 's'},
        4 => +{'name' => 'total_timer_time', 'scale' => 1000, 'unit' => 's'},
        5 => +{'name' => 'total_strokes', 'unit' => 'strokes'},
        6 => +{'name' => 'avg_speed', 'scale' => 1000, 'unit' => 'm/s'},
        7 => +{'name' => 'swim_stroke', 'type_name' => 'swim_stroke'},
        9 => +{'name' => 'avg_swimming_cadence', 'unit' => 'strokes/min'},
        10 => +{'name' => 'event_group'},
        11 => +{'name' => 'total_calories', 'unit' => 'kcal'},
        12 => +{'name' => 'length_type', 'type_name' => 'length_type'},
        18 => +{'name' => 'player_score'},
        19 => +{'name' => 'opponent_score'},
        20 => +{'name' => 'stroke_count', 'unit' => 'counts'},
        21 => +{'name' => 'zone_count', 'unit' => 'counts'},
        22 => +{ 'name' => 'enhanced_avg_respiration_rate', 'unit' => 'breaths/min', 'scale' => 100 },
        23 => +{ 'name' => 'enhanced_max_respiration_rate', 'unit' => 'breaths/min', 'scale' => 100 },
        24 => +{ 'name' => 'avg_respiration_rate' },
        25 => +{ 'name' => 'max_respiration_rate' },
    },

    'record' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'position_lat', 'unit' => 'semicircles'},
        1 => +{'name' => 'position_long', 'unit' => 'semicircles'},
        2 => +{'name' => 'altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        3 => +{'name' => 'heart_rate', 'unit' => 'bpm'},
        4 => +{'name' => 'cadence', 'unit' => 'rpm'},
        5 => +{'name' => 'distance', 'scale' => 100, 'unit' => 'm'},
        6 => +{'name' => 'speed', 'scale' => 1000, 'unit' => 'm/s'},
        7 => +{'name' => 'power', 'unit' => 'watts'},
        8 => +{'name' => 'compressed_speed_distance'}, # complex decoding!
        9 => +{'name' => 'grade', 'scale' => 100, 'unit' => '%'},
        10 => +{'name' => 'resistance'},
        11 => +{'name' => 'time_from_course', 'scale' => 1000, 'unit' => 's'},
        12 => +{'name' => 'cycle_length', 'scale' => 100, 'unit' => 'm'},
        13 => +{'name' => 'temperature', 'unit' => 'deg.C'},
        17 => +{'name' => 'speed_1s', 'scale' => 16, 'unit' => 'm/s'},
        18 => +{'name' => 'cycles', 'unit' => 'cycles'},
        19 => +{'name' => 'total_cycles', 'unit' => 'cycles'},
        28 => +{'name' => 'compressed_accumulated_power', 'unit' => 'watts'},
        29 => +{'name' => 'accumulated_power', 'unit' => 'watts'},
        30 => +{'name' => 'left_right_balance', 'type_name' => 'left_right_balance'},
        31 => +{'name' => 'gps_accuracy', 'unit' => 'm'},
        32 => +{'name' => 'vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        33 => +{'name' => 'calories', 'unit' => 'kcal'},
        39 => +{'name' => 'vertical_oscillation', 'scale' => 10, 'unit' => 'mm'},
        40 => +{'name' => 'stance_time_percent', 'scale' => 100, 'unit' => '%'},
        41 => +{'name' => 'stance_time', 'scale' => 10, 'unit' => 'ms'},
        42 => +{'name' => 'activity_type', 'type_name' => 'activity_type'},
        43 => +{'name' => 'left_torque_effectiveness', 'scale' => 2, 'unit' => '%'},
        44 => +{'name' => 'right_torque_effectiveness', 'scale' => 2, 'unit' => '%'},
        45 => +{'name' => 'left_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        46 => +{'name' => 'right_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        47 => +{'name' => 'combined_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        48 => +{'name' => 'time128', 'scale' => 128, 'unit' => 's'},
        49 => +{'name' => 'stroke_type', 'type_name' => 'stroke_type'},
        50 => +{'name' => 'zone'},
        51 => +{'name' => 'ball_speed', 'scale' => 100, 'unit' => 'm/s'},
        52 => +{'name' => 'cadence256', 'scale' => 256, 'unit' => 'rpm'},
        53 => +{'name' => 'fractional_cadence', 'scale' => 128, 'unit' => 'rpm'},
        54 => +{'name' => 'total_hemoglobin_conc', 'scale' => 100, 'unit' => 'g/dL'},
        55 => +{'name' => 'total_hemoglobin_conc_min', 'scale' => 100, 'unit' => 'g/dL'},
        56 => +{'name' => 'total_hemoglobin_conc_max', 'scale' => 100, 'unit' => 'g/dL'},
        57 => +{'name' => 'saturated_hemoglobin_percent', 'scale' => 10, 'unit' => '%'},
        58 => +{'name' => 'saturated_hemoglobin_percent_min', 'scale' => 10, 'unit' => '%'},
        59 => +{'name' => 'saturated_hemoglobin_percent_max', 'scale' => 10, 'unit' => '%'},
        61 => +{'name' => 'unknown61'}, # unknown UINT16
        62 => +{'name' => 'device_index', 'type_name' => 'device_index'},
        66 => +{'name' => 'unknown66'}, # unknown SINT16
        67 => +{'name' => 'left_pco', 'unit' => 'mm'},
        68 => +{'name' => 'right_pco', 'unit' => 'mm'},
        69 => +{'name' => 'left_power_phase', 'scale' => 0.7111111, 'unit' => 'degrees'},
        70 => +{'name' => 'left_power_phase_peak', 'scale' => 0.7111111, 'unit' => 'degrees'},
        71 => +{'name' => 'right_power_phase', 'scale' => 0.7111111, 'unit' => 'degrees'},
        72 => +{'name' => 'right_power_phase_peak', 'scale' => 0.7111111, 'unit' => 'degrees'},
        73 => +{'name' => 'enhanced_speed', 'scale' => 1000, 'unit' => 'm/s'},
        78 => +{'name' => 'enhanced_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        81 => +{'name' => 'battery_soc', 'scale' => 2, 'unit' => '%'},
        82 => +{'name' => 'motor_power', 'unit' => 'watts'},
        83 => +{'name' => 'vertical_ratio', 'scale' => 100, 'unit' => '%'},
        84 => +{'name' => 'stance_time_balance', 'scale' => 100, 'unit' => '%'},
        85 => +{'name' => 'step_length', 'scale' => 10, 'unit' => 'mm'},
        87 => +{'name' => 'cycle_length16', 'scale' => 100, 'unit' => 'm'},             # Supports larger cycle sizes needed for paddlesports. Max cycle size: 655.35
        91 => +{'name' => 'absolute_pressure', 'unit' => 'Pa'},
        92 => +{'name' => 'depth', 'scale' => 1000, 'unit' => 'm'},
        93 => +{'name' => 'next_stop_depth', 'scale' => 1000, 'unit' => 'm'},
        94 => +{'name' => 'next_stop_time', 'unit' => 's'},
        95 => +{'name' => 'time_to_surface', 'unit' => 's'},
        96 => +{'name' => 'ndl_time', 'unit' => 's'},
        97 => +{'name' => 'cns_load', 'unit' => '%'},
        98 => +{'name' => 'n2_load', 'unit' => '%'},
        99  => +{ 'name' => 'respiration_rate' },
        108 => +{ 'name' => 'enhanced_respiration_rate', 'unit' => 'breaths/min', 'scale' => 100 },
        114 => +{'name' => 'grit'},
        115 => +{'name' => 'flow'},
        116 => +{'name' => 'current_stress', 'scale' => 100},                           # Current Stress value
        117 => +{'name' => 'ebike_travel_range', 'unit' => 'km'},
        118 => +{'name' => 'ebike_battery_level', 'unit' => '%'},
        119 => +{'name' => 'ebike_assist_mode'},
        120 => +{'name' => 'ebike_assist_level_percent', 'unit' => '%'},
        123 => +{ 'name' => 'air_time_remaining' },
        124 => +{ 'name' => 'pressure_sac',     'unit' => 'bar/min', 'scale' => 100 },  # Pressure-based surface air consumption
        125 => +{ 'name' => 'volume_sac',       'unit' => 'l/min', 'scale' => 100 },    # Volumetric surface air consumption
        126 => +{ 'name' => 'rmv',              'unit' => 'l/min', 'scale' => 100 },    # Respiratory minute volume
        127 => +{ 'name' => 'ascent_rate',      'unit' => 'm/s', 'scale' => 1000 },
        129 => +{ 'name' => 'po2',              'unit' => 'percent', 'scale' => 100 },  # Current partial pressure of oxygen
        139 => +{'name' => 'core_temperature',  'scale' => 100, 'unit' => 'deg.C'},
    },

    'event' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'event', 'type_name' => 'event'},
        1 => +{'name' => 'event_type', 'type_name' => 'event_type'},
        2 => +{'name' => 'data16'}, # no switch?

        3 => +{
            'name' => 'data',

            'switch' => +{
                '_by' => 'event',
                'timer' => +{'name' => 'timer_trigger', 'type_name' => 'timer_trigger'},
                'course_point' => +{'name' => 'course_point_index', 'type_name' => 'message_index'},
                'battery' => +{'name' => 'battery_level', 'scale' => 1000, 'unit' => 'V'},
                'virtual_partner_pace' => +{'name' => 'virtual_partner_speed', 'scale' => 1000, 'unit' => 'm/s'},
                'hr_high_alert' => +{'name' => 'hr_high_alert', 'unit' => 'bpm'},
                'hr_low_alert' => +{'name' => 'hr_low_alert', 'unit' => 'bpm'},
                'speed_high_alert' => +{'name' => 'speed_high_alert', 'scale' => 1000, 'unit' => 'm/s'},
                'speed_low_alert' => +{'name' => 'speed_low_alert', 'scale' => 1000, 'unit' => 'm/s'},
                'cad_high_alert' => +{'name' => 'cad_high_alert', 'unit' => 'rpm'},
                'cad_low_alert' => +{'name' => 'cad_low_alert', 'unit' => 'rpm'},
                'power_high_alert' => +{'name' => 'power_high_alert', 'unit' => 'watts'},
                'power_low_alert' => +{'name' => 'power_low_alert', 'unit' => 'watts'},
                'time_duration_alert' => +{'name' => 'time_duration_alert', 'scale' => 1000, 'unit' => 's'},
                'distance_duration_alert' => +{'name' => 'distance_duration_alert', 'scale' => 100, 'unit' => 'm'},
                'calorie_duration_alert' => +{'name' => 'calorie_duration_alert', 'unit' => 'kcal'},
                # why is this key not the same as the name?
                'fitness_equipment' => +{'name' => 'fitness_equipment_state', 'type_name' => 'fitness_equipment_state'},
                'sport_point' => +{'name' => 'sport_point', 'scale' => 11}, # complex decoding!
                'front_gear_change' => +{'name' => 'gear_change_data', 'scale' => 1111}, # complex decoding!
                'rear_gear_change' => +{'name' => 'gear_change_data', 'scale' => 1111}, # complex decoding!
                'rider_position_change' => +{'name' => 'rider_position', 'type_name' => 'rider_position_type'},
                'comm_timeout' => +{'name' => 'comm_timeout', 'type_name' => 'comm_timeout_type'},
                'dive_alert' => +{ 'name' => 'dive_alert', 'type_name' => 'dive_alert' },
                'auto_activity_detect' => +{'name' => 'auto_activity_detect_duration', 'unit' => 'min'},
                'radar_threat_alert' => +{'name' => 'radar_threat_alert'},
            },
        },

        4 => +{'name' => 'event_group'},
        7 => +{'name' => 'score'},
        8 => +{'name' => 'opponent_score'},
        9 => +{'name' => 'front_gear_num'},
        10 => +{'name' => 'front_gear'},
        11 => +{'name' => 'rear_gear_num'},
        12 => +{'name' => 'rear_gear'},
        13 => +{'name' => 'device_index', 'type_name' => 'device_index'},
        14 => +{'name' => 'activity_type', 'type_name' => 'activity_type'}, # Activity Type associated with an auto_activity_detect event
        15 => +{
            'name' => 'start_timestamp',                                    # Timestamp of when the event started

            'switch' => +{
                '_by' => 'event',
                'auto_activity_detect' => +{'name' => 'auto_activity_detect_start_timestamp', 'type_name' => 'date_time', 'unit' => 's'},
            },
        },
        21 => +{'name' => 'radar_threat_level_max', 'type_name' => 'radar_threat_level_type'},
        22 => +{'name' => 'radar_threat_count'},
        23 => +{'name' => 'radar_threat_avg_approach_speed', unit => 'm/s'},
        24 => +{'name' => 'radar_threat_max_approach_speed', unit => 'm/s'},
    },

    'device_info' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'device_index', 'type_name' => 'device_index'},

        1 => +{
            'name' => 'device_type',

            'switch' => +{
                '_by' => 'source_type',
                'bluetooth_low_energy' => +{ 'name' => 'ble_device_type', 'type_name' => 'ble_device_type' },
                'antplus' => +{'name' => 'antplus_device_type', 'type_name' => 'antplus_device_type'},
                'ant' => +{'name' => 'ant_device_type'},
                'local' => +{'name' => 'local_device_type', 'type_name' => 'local_device_type'},
            },
        },

        2 => +{'name' => 'manufacturer', 'type_name' => 'manufacturer'},
        3 => +{'name' => 'serial_number'},

        4 => +{
            'name' => 'product',

            'switch' => +{
                '_by' => 'manufacturer',
                'garmin' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'dynastream' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'dynastream_oem' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'favero_electronics' => +{'name' => 'favero_product', 'type_name' => 'favero_product'},
                'tacx' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
            },
        },

        5 => +{'name' => 'software_version', 'scale' => 100},
        6 => +{'name' => 'hardware_version'},
        7 => +{'name' => 'cum_operating_time', 'unit' => 's'},
        8 => +{'name' => 'unknown8'}, # unknown UINT32
        9 => +{'name' => 'unknown9'}, # unknown UINT8
        10 => +{'name' => 'battery_voltage', 'scale' => 256, 'unit' => 'V'},
        11 => +{'name' => 'battery_status', 'type_name' => 'battery_status'},
        15 => +{'name' => 'unknown15'}, # unknown UINT32
        16 => +{'name' => 'unknown16'}, # unknown UINT32
        18 => +{'name' => 'sensor_position', 'type_name' => 'body_location'},
        19 => +{'name' => 'descriptor'},
        20 => +{'name' => 'ant_transmission_type'},
        21 => +{'name' => 'ant_device_number'},
        22 => +{'name' => 'ant_network', 'type_name' => 'ant_network'},
        24 => +{'name' => 'unknown24'}, # unknown UINT32Z
        25 => +{'name' => 'source_type', 'type_name' => 'source_type'},
        27 => +{'name' => 'product_name'},
        32 => +{'name' => 'battery_level',  'unit' => '%'},
    },

    'device_aux_battery_info' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'device_index', 'type_name' => 'device_index'},
        1 => +{'name' => 'battery_voltage', 'scale' => 256, 'unit' => 'V'},
        2 => +{'name' => 'battery_status', 'type_name' => 'battery_status'},
    },

    'training_file' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'type', 'type_name' => 'file'},
        1 => +{'name' => 'manufacturer', 'type_name' => 'manufacturer'},

        2 => +{
            'name' => 'product',

            'switch' => +{
                '_by' => 'manufacturer',
                'garmin' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'dynastream' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'dynastream_oem' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'favero_electronics' => +{'name' => 'favero_product', 'type_name' => 'favero_product'},
                'tacx' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
            },
        },

        3 => +{'name' => 'serial_number'},
        4 => +{'name' => 'time_created', 'type_name' => 'date_time'},
    },

    'weather_conditions' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'weather_report', 'type_name' => 'weather_report'},
        1 => +{'name' => 'temperature', 'unit' => 'deg.C'},
        2 => +{'name' => 'condition', 'type_name' => 'weather_status'},
        3 => +{'name' => 'wind_direction', 'unit' => 'degrees'},
        4 => +{'name' => 'wind_speed', 'scale' => 1000, 'unit' => 'm/s'},
        5 => +{'name' => 'precipitation_probability'},
        6 => +{'name' => 'temperature_feels_like', 'unit' => 'deg.C'},
        7 => +{'name' => 'relative_humidity', 'unit' => '%'},
        8 => +{'name' => 'location'},
        9 => +{'name' => 'observed_at_time', 'type_name' => 'date_time'},
        10 => +{'name' => 'observed_location_lat', 'unit' => 'semicircles'},
        11 => +{'name' => 'observed_location_long', 'unit' => 'semicircles'},
        12 => +{'name' => 'day_of_week', 'type_name' => 'day_of_week'},
        13 => +{'name' => 'high_temperature', 'unit' => 'deg.C'},
        14 => +{'name' => 'low_temperature', 'unit' => 'deg.C'},
    },

    'weather_alert' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'report_id'},
        1 => +{'name' => 'issue_time', 'type_name' => 'date_time'},
        2 => +{'name' => 'expire_time', 'type_name' => 'date_time'},
        3 => +{'name' => 'severity', 'type_name' => 'weather_severity'},
        4 => +{'name' => 'type', 'type_name' => 'weather_severe_type'},
    },

    'gps_metadata' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        1 => +{'name' => 'position_lat', 'unit' => 'semicircles'},
        2 => +{'name' => 'position_long', 'unit' => 'semicircles'},
        3 => +{'name' => 'enhanced_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        4 => +{'name' => 'enhanced_speed', 'scale' => 1000, 'unit' => 'm/s'},
        5 => +{'name' => 'heading', 'scale' => 100, 'unit' => 'degrees'},
        6 => +{'name' => 'utc_timestamp', 'type_name' => 'date_time'},
        7 => +{'name' => 'velocity', 'scale' => 100, 'unit' => 'm/s'},
    },

    'camera_event' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        1 => +{'name' => 'camera_event_type', 'type_name' => 'camera_event_type'},
        2 => +{'name' => 'camera_file_uuid'},
        3 => +{'name' => 'camera_orientation', 'type_name' => 'camera_orientation_type'},
    },

    'gyroscope_data' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        1 => +{'name' => 'sample_time_offset', 'unit' => 'ms'},
        2 => +{'name' => 'gyro_x', 'unit' => 'counts'},
        3 => +{'name' => 'gyro_y', 'unit' => 'counts'},
        4 => +{'name' => 'gyro_z', 'unit' => 'counts'},
        5 => +{'name' => 'calibrated_gyro_x', 'unit' => 'deg/s'},
        6 => +{'name' => 'calibrated_gyro_y', 'unit' => 'deg/s'},
        7 => +{'name' => 'calibrated_gyro_z', 'unit' => 'deg/s'},
    },

    'accelerometer_data' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        1 => +{'name' => 'sample_time_offset', 'unit' => 'ms'},
        2 => +{'name' => 'accel_x', 'unit' => 'counts'},
        3 => +{'name' => 'accel_y', 'unit' => 'counts'},
        4 => +{'name' => 'accel_z', 'unit' => 'counts'},
        5 => +{'name' => 'calibrated_accel_x', 'unit' => 'g'},
        6 => +{'name' => 'calibrated_accel_y', 'unit' => 'g'},
        7 => +{'name' => 'calibrated_accel_z', 'unit' => 'g'},
        8 => +{'name' => 'compressed_calibrated_accel_x', 'unit' => 'mG'},
        9 => +{'name' => 'compressed_calibrated_accel_y', 'unit' => 'mG'},
        10 => +{'name' => 'compressed_calibrated_accel_z', 'unit' => 'mG'},
    },

    'magnetometer_data' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        1 => +{'name' => 'sample_time_offset', 'unit' => 'ms'},
        2 => +{'name' => 'mag_x', 'unit' => 'counts'},
        3 => +{'name' => 'mag_y', 'unit' => 'counts'},
        4 => +{'name' => 'mag_z', 'unit' => 'counts'},
        5 => +{'name' => 'calibrated_mag_x', 'unit' => 'G'},
        6 => +{'name' => 'calibrated_mag_y', 'unit' => 'G'},
        7 => +{'name' => 'calibrated_mag_z', 'unit' => 'G'},
    },

    'barometer_data' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        1 => +{'name' => 'sample_time_offset', 'unit' => 'ms'},
        2 => +{'name' => 'baro_pres', 'unit' => 'Pa'},
    },

    'three_d_sensor_calibration' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'sensor_type', 'type_name' => 'sensor_type'},

        1 => +{
            'name' => 'calibration_factor',

            'switch' => +{
                '_by' => 'sensor_type',
                'accelerometer' => +{'name' => 'accel_cal_factor'},
                'gyroscope' => +{'name' => 'gyro_cal_factor'},
            },
        },

        2 => +{'name' => 'calibration_divisor', 'unit' => 'counts'},
        3 => +{'name' => 'level_shift'},
        4 => +{'name' => 'offset_cal'},
        5 => +{'name' => 'orientation_matrix', 'scale' => 65535},
    },

    'one_d_sensor_calibration' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'sensor_type', 'type_name' => 'sensor_type'},

        1 => +{
            'name' => 'calibration_factor',

            'switch' => +{
                '_by' => 'sensor_type',
                'barometer' => +{'name' => 'baro_cal_factor'},
            },
        },

        2 => +{'name' => 'calibration_divisor', 'unit' => 'counts'},
        3 => +{'name' => 'level_shift'},
        4 => +{'name' => 'offset_cal'},
    },

    'video_frame' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        1 => +{'name' => 'frame_number'},
    },

    'obdii_data' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        1 => +{'name' => 'time_offset', 'unit' => 'ms'},
        2 => +{'name' => 'pid'},
        3 => +{'name' => 'raw_data'},
        4 => +{'name' => 'pid_data_size'},
        5 => +{'name' => 'system_time'},
        6 => +{'name' => 'start_timestamp', 'type_name' => 'date_time'},
        7 => +{'name' => 'start_timestamp_ms', 'unit' => 'ms'},
    },

    'nmea_sentence' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        1 => +{'name' => 'sentence'},
    },

    'aviation_attitude' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},
        1 => +{'name' => 'system_time', 'unit' => 'ms'},
        2 => +{'name' => 'pitch', 'scale' => 10430.38, 'unit' => 'radians'},
        3 => +{'name' => 'roll', 'scale' => 10430.38, 'unit' => 'radians'},
        4 => +{'name' => 'accel_lateral', 'scale' => 100, 'unit' => 'm/s^2'},
        5 => +{'name' => 'accel_normal', 'scale' => 100, 'unit' => 'm/s^2'},
        6 => +{'name' => 'turn_rate', 'scale' => 1024, 'unit' => 'radians/second'},
        7 => +{'name' => 'stage', 'type_name' => 'attitude_stage'},
        8 => +{'name' => 'attitude_stage_complete', 'unit' => '%'},
        9 => +{'name' => 'track', 'scale' => 10430.38, 'unit' => 'radians'},
        10 => +{'name' => 'validity', 'type_name' => 'attitude_validity'},
    },

    'video' => +{
        0 => +{'name' => 'url'},
        1 => +{'name' => 'hosting_provider'},
        2 => +{'name' => 'duration', 'unit' => 'ms'},
    },

    'video_title' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'message_count'},
        1 => +{'name' => 'text'},
    },

    'video_description' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'message_count'},
        1 => +{'name' => 'text'},
    },

    'video_clip' => +{
        0 => +{'name' => 'clip_number'},
        1 => +{'name' => 'start_timestamp', 'type_name' => 'date_time'},
        2 => +{'name' => 'start_timestamp_ms', 'unit' => 'ms'},
        3 => +{'name' => 'end_timestamp', 'type_name' => 'date_time'},
        4 => +{'name' => 'end_timestamp_ms', 'unit' => 'ms'},
        6 => +{'name' => 'clip_start', 'unit' => 'ms'},
        7 => +{'name' => 'clip_end', 'unit' => 'ms'},
    },

    'set' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'duration', 'scale' => 1000, 'unit' => 's'},
        3 => +{'name' => 'repetitions'},
        4 => +{'name' => 'weight', 'scale' => 16, 'unit' => 'kg'},
        5 => +{'name' => 'set_type', 'type_name' => 'set_type'},
        6 => +{'name' => 'start_time', 'type_name' => 'date_time'},
        7 => +{'name' => 'category', 'type_name' => 'exercise_category'},
        8 => +{'name' => 'category_subtype'},
        9 => +{'name' => 'weight_display_unit', 'type_name' => 'fit_base_unit'},
        10 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        11 => +{'name' => 'wkt_step_index', 'type_name' => 'message_index'},
    },

    'jump' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'distance', 'unit' => 'm'},
        1 => +{'name' => 'height', 'unit' => 'm'},
        2 => +{'name' => 'rotations'},
        3 => +{'name' => 'hang_time', 'unit' => 's'},
        4 => +{'name' => 'score'},
        5 => +{'name' => 'position_lat', 'unit' => 'semicircles'},
        6 => +{'name' => 'position_long', 'unit' => 'semicircles'},
        7 => +{'name' => 'speed', 'scale' => 1000, 'unit' => 'm/s'},
        8 => +{'name' => 'enhanced_speed', 'scale' => 1000, 'unit' => 'm/s'},
    },

    'split' => +{
        254 => +{ 'name' => 'message_index',       'type_name' => 'message_index' },
        0   => +{ 'name' => 'split_type',          'type_name' => 'split_type'    },
        1   => +{ 'name' => 'total_elapsed_time',  'unit' => 's', 'scale' => 1000 },
        2   => +{ 'name' => 'total_timer_time',    'unit' => 's', 'scale' => 1000 },
        3   => +{ 'name' => 'total_distance',      'unit' => 'm', 'scale' => 100  },
        4   => +{ 'name' => 'avg_speed',           'unit' => 'm/s', 'scale' => 1000 },
        9   => +{ 'name' => 'start_time',          'type_name' => 'date_time' },
        13  => +{ 'name' => 'total_ascent',        'unit' => 'm'},
        14  => +{ 'name' => 'total_descent',       'unit' => 'm'},
        21  => +{ 'name' => 'start_position_lat',  'unit' => 'semicircles'},
        22  => +{ 'name' => 'start_position_long', 'unit' => 'semicircles'},
        23  => +{ 'name' => 'end_position_lat',    'unit' => 'semicircles'},
        24  => +{ 'name' => 'end_position_long',   'unit' => 'semicircles'},
        25  => +{ 'name' => 'max_speed',           'unit' => 'm/s', 'scale' => 1000 },
        26  => +{ 'name' => 'avg_vert_speed',      'unit' => 'm/s', 'scale' => 1000 },
        27  => +{ 'name' => 'end_time',            'type_name' => 'date_time' },
        28  => +{ 'name' => 'total_calories',      'unit' => 'kcal'},
        74  => +{ 'name' => 'start_elevation',     'unit' => 'm', 'scale' => 5, 'offset' => 500 },
        110 => +{ 'name' => 'total_moving_time',   'unit' => 's', 'scale' => 1000 },
    },

    'split_summary' => +{
        254 => +{ 'name' => 'message_index',       'type_name' => 'message_index' },
        0   => +{ 'name' => 'split_type',          'type_name' => 'split_type'    },
        3   => +{ 'name' => 'num_splits' },
        4   => +{ 'name' => 'total_timer_time',    'unit' => 's', 'scale' => 1000 },
        5   => +{ 'name' => 'total_distance',      'unit' => 'm', 'scale' => 100  },
        6   => +{ 'name' => 'avg_speed',           'unit' => 'm/s', 'scale' => 1000 },
        7   => +{ 'name' => 'max_speed',           'unit' => 'm/s', 'scale' => 1000 },
        8   => +{ 'name' => 'total_ascent',        'unit' => 'm' },
        9   => +{ 'name' => 'total_descent',       'unit' => 'm' },
        10  => +{ 'name' => 'avg_heart_rate',      'unit' => 'bpm' },
        11  => +{ 'name' => 'max_heart_rate',      'unit' => 'bpm' },
        12  => +{ 'name' => 'avg_vert_speed',      'unit' => 'm/s', 'scale' => 1000 },
        13  => +{ 'name' => 'total_calories',      'unit' => 'kcal' },
        77  => +{ 'name' => 'total_moving_time',   'unit' => 's', 'scale' => 1000 },
    },

    'climb_pro' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'position_lat', 'unit' => 'semicircles'},
        1 => +{'name' => 'position_long', 'unit' => 'semicircles'},
        2 => +{'name' => 'climb_pro_event', 'type_name' => 'climb_pro_event'},
        3 => +{'name' => 'climb_number'},
        4 => +{'name' => 'climb_category'},
        5 => +{'name' => 'current_dist', 'unit' => 'm'},
    },

    'field_description' => +{
        0 => +{'name' => 'developer_data_index'},
        1 => +{'name' => 'field_definition_number'},
        2 => +{'name' => 'fit_base_type_id', 'type_name' => 'fit_base_type'},
        3 => +{'name' => 'field_name'},
        4 => +{'name' => 'array'},
        5 => +{'name' => 'components'},
        6 => +{'name' => 'scale'},
        7 => +{'name' => 'offset'},
        8 => +{'name' => 'units'},
        9 => +{'name' => 'bits'},
        10 => +{'name' => 'accumulate'},
        13 => +{'name' => 'fit_base_unit_id', 'type_name' => 'fit_base_unit'},
        14 => +{'name' => 'native_mesg_num', 'type_name' => 'mesg_num'},
        15 => +{'name' => 'native_field_num'},
    },

    'developer_data_id' => +{
        0 => +{'name' => 'developer_id'},
        1 => +{'name' => 'application_id'},
        2 => +{'name' => 'manufacturer_id', 'type_name' => 'manufacturer'},
        3 => +{'name' => 'developer_data_index'},
        4 => +{'name' => 'application_version'},
    },

    'course' => +{                      # begins === Course file messages === section
        4 => +{'name' => 'sport', 'type_name' => 'sport'},
        5 => +{'name' => 'name'},
        6 => +{'name' => 'capabilities', 'type_name' => 'course_capabilities'},
        7 => +{'name' => 'sub_sport', 'type_name' => 'sub_sport'},
    },

    'course_point' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        1 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        2 => +{'name' => 'position_lat', 'unit' => 'semicircles'},
        3 => +{'name' => 'position_long', 'unit' => 'semicircles'},
        4 => +{'name' => 'distance', 'scale' => 100, 'unit' => 'm'},
        5 => +{'name' => 'type', 'type_name' => 'course_point'},
        6 => +{'name' => 'name'},
        8 => +{'name' => 'favorite', 'type_name' => 'bool'},
    },

    'segment_id' => +{                  # begins === Segment file messages === section
        0 => +{'name' => 'name'},
        1 => +{'name' => 'uuid'},
        2 => +{'name' => 'sport', 'type_name' => 'sport'},
        3 => +{'name' => 'enabled', 'type_name' => 'bool'},
        4 => +{'name' => 'user_profile_primary_key'},
        5 => +{'name' => 'device_id'},
        6 => +{'name' => 'default_race_leader'},
        7 => +{'name' => 'delete_status', 'type_name' => 'segment_delete_status'},
        8 => +{'name' => 'selection_type', 'type_name' => 'segment_selection_type'},
    },

    'segment_leaderboard_entry' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'name'},
        1 => +{'name' => 'type', 'type_name' => 'segment_leaderboard_type'},
        2 => +{'name' => 'group_primary_key'},
        3 => +{'name' => 'activity_id'},
        4 => +{'name' => 'segment_time', 'scale' => 1000, 'unit' => 's'},
        5 => +{'name' => 'activity_id_string'},
    },

    'segment_point' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        1 => +{'name' => 'position_lat', 'unit' => 'semicircles'},
        2 => +{'name' => 'position_long', 'unit' => 'semicircles'},
        3 => +{'name' => 'distance', 'scale' => 100, 'unit' => 'm'},
        4 => +{'name' => 'altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        5 => +{'name' => 'leader_time', 'scale' => 1000, 'unit' => 's'},
        6 => +{ 'name' => 'enhanced_altitude', 'unit' => 'm', 'scale' => 5 }, # Accumulated altitude along the segment at the described point
    },

    'segment_lap' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'event', 'type_name' => 'event'},
        1 => +{'name' => 'event_type', 'type_name' => 'event_type'},
        2 => +{'name' => 'start_time', 'type_name' => 'date_time'},
        3 => +{'name' => 'start_position_lat', 'unit' => 'semicircles'},
        4 => +{'name' => 'start_position_long', 'unit' => 'semicircles'},
        5 => +{'name' => 'end_position_lat', 'unit' => 'semicircles'},
        6 => +{'name' => 'end_position_long', 'unit' => 'semicircles'},
        7 => +{'name' => 'total_elapsed_time', 'scale' => 1000, 'unit' => 's'},
        8 => +{'name' => 'total_timer_time', 'scale' => 1000, 'unit' => 's'},
        9 => +{'name' => 'total_distance', 'scale' => 100, 'unit' => 'm'},

        10 => +{
            'name' => 'total_cycles', 'unit' => 'cycles',

            'switch' => +{
                '_by' => 'sport',
                'walking' => +{'name' => 'total_steps', 'unit' => 'steps'},
                'running' => +{'name' => 'total_strides', 'unit' => 'strides'},
                'swimming' => +{'name' => 'total_strokes', 'unit' => 'strokes'},
            },
        },

        11 => +{'name' => 'total_calories', 'unit' => 'kcal'},
        12 => +{'name' => 'total_fat_calories', 'unit' => 'kcal'},
        13 => +{'name' => 'avg_speed', 'scale' => 1000, 'unit' => 'm/s'},
        14 => +{'name' => 'max_speed', 'scale' => 1000, 'unit' => 'm/s'},
        15 => +{'name' => 'avg_heart_rate', 'unit' => 'bpm'},
        16 => +{'name' => 'max_heart_rate', 'unit' => 'bpm'},
        17 => +{'name' => 'avg_cadence', 'unit' => 'rpm'},
        18 => +{'name' => 'max_cadence', 'unit' => 'rpm'},
        19 => +{'name' => 'avg_power', 'unit' => 'watts'},
        20 => +{'name' => 'max_power', 'unit' => 'watts'},
        21 => +{'name' => 'total_ascent', 'unit' => 'm'},
        22 => +{'name' => 'total_descent', 'unit' => 'm'},
        23 => +{'name' => 'sport', 'type_name' => 'sport'},
        24 => +{'name' => 'event_group'},
        25 => +{'name' => 'nec_lat', 'unit' => 'semicircles'},
        26 => +{'name' => 'nec_long', 'unit' => 'semicircles'},
        27 => +{'name' => 'swc_lat', 'unit' => 'semicircles'},
        28 => +{'name' => 'swc_long', 'unit' => 'semicircles'},
        29 => +{'name' => 'name'},
        30 => +{'name' => 'normalized_power', 'unit' => 'watts'},
        31 => +{'name' => 'left_right_balance', 'type_name' => 'left_right_balance_100'},
        32 => +{'name' => 'sub_sport', 'type_name' => 'sub_sport'},
        33 => +{'name' => 'total_work', 'unit' => 'J'},
        34 => +{'name' => 'avg_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        35 => +{'name' => 'max_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        36 => +{'name' => 'gps_accuracy', 'unit' => 'm'},
        37 => +{'name' => 'avg_grade', 'scale' => 100, 'unit' => '%'},
        38 => +{'name' => 'avg_pos_grade', 'scale' => 100, 'unit' => '%'},
        39 => +{'name' => 'avg_neg_grade', 'scale' => 100, 'unit' => '%'},
        40 => +{'name' => 'max_pos_grade', 'scale' => 100, 'unit' => '%'},
        41 => +{'name' => 'max_neg_grade', 'scale' => 100, 'unit' => '%'},
        42 => +{'name' => 'avg_temperature', 'unit' => 'deg.C'},
        43 => +{'name' => 'max_temperature', 'unit' => 'deg.C'},
        44 => +{'name' => 'total_moving_time', 'scale' => 1000, 'unit' => 's'},
        45 => +{'name' => 'avg_pos_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        46 => +{'name' => 'avg_neg_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        47 => +{'name' => 'max_pos_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        48 => +{'name' => 'max_neg_vertical_speed', 'scale' => 1000, 'unit' => 'm/s'},
        49 => +{'name' => 'time_in_hr_zone', 'scale' => 1000, 'unit' => 's'},
        50 => +{'name' => 'time_in_speed_zone', 'scale' => 1000, 'unit' => 's'},
        51 => +{'name' => 'time_in_cadence_zone', 'scale' => 1000, 'unit' => 's'},
        52 => +{'name' => 'time_in_power_zone', 'scale' => 1000, 'unit' => 's'},
        53 => +{'name' => 'repetition_num'},
        54 => +{'name' => 'min_altitude', 'scale' => 5, 'offset' => 500, 'unit' => 'm'},
        55 => +{'name' => 'min_heart_rate', 'unit' => 'bpm'},
        56 => +{'name' => 'active_time', 'scale' => 1000, 'unit' => 's'},
        57 => +{'name' => 'wkt_step_index', 'type_name' => 'message_index'},
        58 => +{'name' => 'sport_event', 'type_name' => 'sport_event'},
        59 => +{'name' => 'avg_left_torque_effectiveness', 'scale' => 2, 'unit' => '%'},
        60 => +{'name' => 'avg_right_torque_effectiveness', 'scale' => 2, 'unit' => '%'},
        61 => +{'name' => 'avg_left_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        62 => +{'name' => 'avg_right_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        63 => +{'name' => 'avg_combined_pedal_smoothness', 'scale' => 2, 'unit' => '%'},
        64 => +{'name' => 'status', 'type_name' => 'segment_lap_status'},
        65 => +{'name' => 'uuid'},
        66 => +{'name' => 'avg_fractional_cadence', 'scale' => 128, 'unit' => 'rpm'},
        67 => +{'name' => 'max_fractional_cadence', 'scale' => 128, 'unit' => 'rpm'},
        68 => +{'name' => 'total_fractional_cycles', 'scale' => 128, 'unit' => 'cycles'},
        69 => +{'name' => 'front_gear_shift_count'},
        70 => +{'name' => 'rear_gear_shift_count'},
        71 => +{'name' => 'time_standing', 'scale' => 1000, 'unit' => 's'},
        72 => +{'name' => 'stand_count'},
        73 => +{'name' => 'avg_left_pco', 'unit' => 'mm'},
        74 => +{'name' => 'avg_right_pco', 'unit' => 'mm'},
        75 => +{'name' => 'avg_left_power_phase', 'scale' => 0.7111111, 'unit' => 'degrees'},
        76 => +{'name' => 'avg_left_power_phase_peak', 'scale' => 0.7111111, 'unit' => 'degrees'},
        77 => +{'name' => 'avg_right_power_phase', 'scale' => 0.7111111, 'unit' => 'degrees'},
        78 => +{'name' => 'avg_right_power_phase_peak', 'scale' => 0.7111111, 'unit' => 'degrees'},
        79 => +{'name' => 'avg_power_position', 'unit' => 'watts'},
        80 => +{'name' => 'max_power_position', 'unit' => 'watts'},
        81 => +{'name' => 'avg_cadence_position', 'unit' => 'rpm'},
        82 => +{'name' => 'max_cadence_position', 'unit' => 'rpm'},
        83 => +{'name' => 'manufacturer', 'type_name' => 'manufacturer'},
        84 => +{'name' => 'total_grit', 'unit' => 'kGrit'},
        85 => +{'name' => 'total_flow', 'unit' => 'Flow'},
        86 => +{'name' => 'avg_grit', 'unit' => 'kGrit'},
        87 => +{'name' => 'avg_flow', 'unit' => 'Flow'},
        89 => +{'name' => 'total_fractional_ascent', 'unit' => 'm'},
        90 => +{'name' => 'total_fractional_descent', 'unit' => 'm'},
        91 => +{ 'name' => 'enhanced_avg_altitude', 'unit' => 'm', 'scale' => 5 },
        92 => +{ 'name' => 'enhanced_max_altitude', 'unit' => 'm', 'scale' => 5 },
        93 => +{ 'name' => 'enhanced_min_altitude', 'unit' => 'm', 'scale' => 5 },
    },

    'segment_file' => +{                # begins === Segment list file messages === section
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        1 => +{'name' => 'file_uuid'},
        3 => +{'name' => 'enabled', 'type_name' => 'bool'},
        4 => +{'name' => 'user_profile_primary_key'},
        7 => +{'name' => 'leader_type', 'type_name' => 'segment_leaderboard_type'},
        8 => +{'name' => 'leader_group_primary_key'},
        9 => +{'name' => 'leader_activity_id'},
        10 => +{'name' => 'leader_activity_id_string'},
        11 => +{'name' => 'default_race_leader'},
    },

    'workout' => +{                     # begins === Workout file messages === section
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        4 => +{'name' => 'sport', 'type_name' => 'sport'},
        5 => +{'name' => 'capabilities', 'type_name' => 'workout_capabilities'},
        6 => +{'name' => 'num_valid_steps'},
        7 => +{'name' => 'protection'}, # not present?
        8 => +{'name' => 'wkt_name'},
        11 => +{'name' => 'sub_sport', 'type_name' => 'sub_sport'},
        14 => +{'name' => 'pool_length', 'scale' => 100, 'unit' => 'm'},
        15 => +{'name' => 'pool_length_unit', 'type_name' => 'display_measure'},
    },

    'workout_session' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'sport', 'type_name' => 'sport'},
        1 => +{'name' => 'sub_sport', 'type_name' => 'sub_sport'},
        2 => +{'name' => 'num_valid_steps'},
        3 => +{'name' => 'first_step_index'},
        4 => +{'name' => 'pool_length', 'scale' => 100, 'unit' => 'm'},
        5 => +{'name' => 'pool_length_unit', 'type_name' => 'display_measure'},
    },

    'workout_step' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'wkt_step_name'},
        1 => +{'name' => 'duration_type', 'type_name' => 'wkt_step_duration'},

        2 => +{
            'name' => 'duration_value',

            'switch' => +{
                '_by' => 'duration_type',
                'time' => +{'name' => 'duration_time', 'scale' => 1000, 'unit' => 's'},
                'repetition_time' => +{'name' => 'duration_time', 'scale' => 1000, 'unit' => 's'},
                'distance' => +{'name' => 'duration_distance', 'scale' => 100, 'unit' => 'm'},
                'hr_less_than' => +{'name' => 'duration_hr', 'type_name' => 'workout_hr', 'unit' => 'bpm'},
                'hr_greater_than' => +{'name' => 'duration_hr', 'type_name' => 'workout_hr', 'unit' => 'bpm'},
                'calories' => +{'name' => 'duration_calories', 'unit' => 'kcal'},
                'repeat_until_steps_cmplt' => +{'name' => 'duration_step'},
                'repeat_until_time' => +{'name' => 'duration_step'},
                'repeat_until_distance' => +{'name' => 'duration_step'},
                'repeat_until_calories' => +{'name' => 'duration_step'},
                'repeat_until_hr_less_than' => +{'name' => 'duration_step'},
                'repeat_until_hr_greater_than' => +{'name' => 'duration_step'},
                'repeat_until_power_less_than' => +{'name' => 'duration_step'},
                'repeat_until_power_greater_than' => +{'name' => 'duration_step'},
                'power_less_than' => +{'name' => 'duration_power', 'type_name' => 'workout_power', 'unit' => 'watts'},
                'power_greater_than' => +{'name' => 'duration_power', 'type_name' => 'workout_power', 'unit' => 'watts'},
                'reps' => +{'name' => 'duration_reps'},
            },
        },

        3 => +{'name' => 'target_type', 'type_name' => 'wkt_step_target'},

        4 => +{
            'name' => 'target_value',

            'switch' => +{
                '_by' => [qw(target_type duration_type)],
                'speed' => +{'name' => 'target_speed_zone'},
                'heart_rate' => +{'name' => 'target_hr_zone'},
                'cadence' => +{'name' => 'target_cadence_zone'},
                'power' => +{'name' => 'target_power_zone'},
                'repeat_until_steps_cmplt' => +{'name' => 'repeat_steps'},
                'repeat_until_time' => +{'name' => 'repeat_time', 'scale' => 1000, 'unit' => 's'},
                'repeat_until_distance' => +{'name' => 'repeat_distance', 'scale' => 100, 'unit' => 'm'},
                'repeat_until_calories' => +{'name' => 'repeat_calories', 'unit' => 'kcal'},
                'repeat_until_hr_less_than' => +{'name' => 'repeat_hr', 'type_name' => 'workout_hr', 'unit' => 'bpm'},
                'repeat_until_hr_greater_than' => +{'name' => 'repeat_hr', 'type_name' => 'workout_hr', 'unit' => 'bpm'},
                'repeat_until_power_less_than' => +{'name' => 'repeat_power', 'type_name' => 'workout_power', 'unit' => 'watts'},
                'repeat_until_power_greater_than' => +{'name' => 'repeat_power', 'type_name' => 'workout_power', 'unit' => 'watts'},
                'swim_stroke' => +{'name' => 'target_stroke_type', 'type_name' => 'swim_stroke'},
            },
        },

        5 => +{
            'name' => 'custom_target_value_low',

            'switch' => +{
                '_by' => 'target_type',
                'speed' => +{'name' => 'custom_target_speed_low', 'scale' => 1000, 'unit' => 'm/s'},
                'heart_rate' => +{'name' => 'custom_target_heart_rate_low', 'type_name' => 'workout_hr', 'unit' => 'bpm'},
                'cadence' => +{'name' => 'custom_target_cadence_low', 'unit' => 'rpm'},
                'power' => +{'name' => 'custom_target_power_low', 'type_name' => 'workout_power', 'unit' => 'watts'},
            },
        },

        6 => +{
            'name' => 'custom_target_value_high',

            'switch' => +{
                '_by' => 'target_type',
                'speed' => +{'name' => 'custom_target_speed_high', 'scale' => 1000, 'unit' => 'm/s'},
                'heart_rate' => +{'name' => 'custom_target_heart_rate_high', 'type_name' => 'workout_hr', 'unit' => 'bpm'},
                'cadence' => +{'name' => 'custom_target_cadence_high', 'unit' => 'rpm'},
                'power' => +{'name' => 'custom_target_power_high', 'type_name' => 'workout_power', 'unit' => 'watts'},
            },
        },

        7 => +{'name' => 'intensity', 'type_name' => 'intensity'},
        8 => +{'name' => 'notes', 'type_name' => 'string'},
        9 => +{'name' => 'equipment', 'type_name' => 'workout_equipment'},
        10 => +{'name' => 'exercise_category', 'type_name' => 'exercise_category'},
        11 => +{'name' => 'exercise_name'},
        12 => +{'name' => 'exercise_weight', 'scale' => 100, 'unit' => 'kg'},
        13 => +{'name' => 'weight_display_unit', 'type_name' => 'fit_base_unit'},
        19 => +{'name' => 'secondary_target_type', 'type_name' => 'wkt_step_target'},
        20 => +{
            'name' => 'secondary_target_value',
            'switch' => +{
                '_by' => 'secondary_target_type',
                'speed' => +{'name' => 'secondary_target_speed_zone'},
                'heart_rate' => +{'name' => 'secondary_target_hr_zone'},
                'cadence' => +{'name' => 'secondary_target_cadence_zone'},
                'power' => +{'name' => 'secondary_target_power_zone'},
                'swim_stroke' => +{'name' => 'secondary_target_stroke_type', 'type_name' => 'swim_stroke'},
            },
        },
    },

    'exercise_title' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'exercise_category', 'type_name' => 'exercise_category'},
        1 => +{'name' => 'exercise_name'},
        2 => +{'name' => 'wkt_step_name', 'type_name' => 'string'},
    },

    'schedule' => +{                    # begins === Schedule file messages === section
        0 => +{'name' => 'manufacturer', 'type_name' => 'manufacturer'},

        1 => +{
            'name' => 'product',

            'switch' => +{
                '_by' => 'manufacturer',
                'garmin' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'dynastream' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'dynastream_oem' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
                'favero_electronics' => +{'name' => 'favero_product', 'type_name' => 'favero_product'},
                'tacx' => +{'name' => 'garmin_product', 'type_name' => 'garmin_product'},
            },
        },

        2 => +{'name' => 'serial_number'},
        3 => +{'name' => 'time_created', 'type_name' => 'date_time'},
        4 => +{'name' => 'completed', 'type_name' => 'bool'},
        5 => +{'name' => 'type', 'type_name' => 'schedule'},
        6 => +{'name' => 'schedule_time', 'type_name' => 'local_date_time'},
    },

    'totals' => +{                      # begins === Totals file messages === section
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timer_time', 'unit' => 's'},
        1 => +{'name' => 'distance', 'unit' => 'm'},
        2 => +{'name' => 'calories', 'unit' => 'kcal'},
        3 => +{'name' => 'sport', 'type_name' => 'sport'},
        4 => +{'name' => 'elapsed_time', 'unit' => 's'},
        5 => +{'name' => 'sessions'},
        6 => +{'name' => 'active_time', 'unit' => 's'},
        9 => +{'name' => 'sport_index'},
        10 => +{'name' => 'profile_name'}, # unknown STRING
    },

    'weight_scale' => +{                # begins === Weight scale file messages === section
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'weight', 'type_name' => 'weight', 'scale' => 100, 'unit' => 'kg'},
        1 => +{'name' => 'percent_fat', 'scale' => 100, 'unit' => '%'},
        2 => +{'name' => 'percent_hydration', 'scale' => 100, 'unit' => '%'},
        3 => +{'name' => 'visceral_fat_mass', 'scale' => 100, 'unit' => 'kg'},
        4 => +{'name' => 'bone_mass', 'scale' => 100, 'unit' => 'kg'},
        5 => +{'name' => 'muscle_mass', 'scale' => 100, 'unit' => 'kg'},
        7 => +{'name' => 'basal_met', 'scale' => 4, 'unit' => 'kcal/day'},
        8 => +{'name' => 'physique_rating'},
        9 => +{'name' => 'active_met', 'scale' => 4, 'unit' => 'kcal/day'},
        10 => +{'name' => 'metabolic_age', 'unit' => 'years'},
        11 => +{'name' => 'visceral_fat_rating'},
        12 => +{'name' => 'user_profile_index', 'type_name' => 'message_index'},
        13 => +{'name' => 'bmi', 'scale' => 10, 'unit' => 'kg/m^2'},
    },

    'blood_pressure' => +{              # begins === Blood pressure file messages === section
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'systolic_pressure', 'unit' => 'mmHg'},
        1 => +{'name' => 'diastolic_pressure', 'unit' => 'mmHg'},
        2 => +{'name' => 'mean_arterial_pressure', 'unit' => 'mmHg'},
        3 => +{'name' => 'map_3_sample_mean', 'unit' => 'mmHg'},
        4 => +{'name' => 'map_morning_values', 'unit' => 'mmHg'},
        5 => +{'name' => 'map_evening_values', 'unit' => 'mmHg'},
        6 => +{'name' => 'heart_rate', 'unit' => 'bpm'},
        7 => +{'name' => 'heart_rate_type', 'type_name' => 'hr_type'},
        8 => +{'name' => 'status', 'type_name' => 'bp_status'},
        9 => +{'name' => 'user_profile_index', 'type_name' => 'message_index'},
    },

    'monitoring_info' => +{             # begins === Monitoring file messages === section
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'local_timestamp', 'type_name' => 'local_date_time'},
        1 => +{'name' => 'activity_type', 'type_name' => 'activity_type'},
        3 => +{'name' => 'cycles_to_distance', 'scale' => 5000, 'unit' => 'm/cycle'},
        4 => +{'name' => 'cycles_to_calories', 'scale' => 5000, 'unit' => 'kcal/cycle'},
        5 => +{'name' => 'resting_metabolic_rate', 'unit' => 'kcal/day'},
    },

    'monitoring' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'device_index', 'type_name' => 'device_index'},
        1 => +{'name' => 'calories', 'unit' => 'kcal'},
        2 => +{'name' => 'distance', 'scale' => 100, 'unit' => 'm'},

        3 => +{
            'name' => 'cycles', 'scale' => 2, 'unit' => 'cycles',

            'switch' => +{
                '_by' => 'activity_type',
                'walking' => +{'name' => 'total_steps', 'scale' => 1, 'unit' => 'steps'},
                'running' => +{'name' => 'total_strides', 'scale' => 1, 'unit' => 'strides'},
                'cycling' => +{'name' => 'total_strokes', 'scale' => 2, 'unit' => 'strokes'},
                'swimming' => +{'name' => 'total_strokes', 'scale' => 2, 'unit' => 'strokes'},
            },
        },

        4 => +{'name' => 'active_time', 'scale' => 1000, 'unit' => 's'},
        5 => +{'name' => 'activity_type', 'type_name' => 'activity_type'},
        6 => +{'name' => 'activity_subtype', 'type_name' => 'activity_subtype'},
        7 => +{'name' => 'activity_level', 'type_name' => 'activity_level'},
        8 => +{'name' => 'distance_16', 'scale' => 100, 'unit' => 'm'},
        9 => +{'name' => 'cycles_16', 'scale' => 2, 'unit' => 'cycles'},
        10 => +{'name' => 'active_time_16', 'unit' => 's'},
        11 => +{'name' => 'local_timestamp', 'type_name' => 'local_date_time'},
        12 => +{'name' => 'temperature', 'scale' => 100, 'unit' => 'deg.C'},
        14 => +{'name' => 'temperature_min', 'scale' => 100, 'unit' => 'deg.C'},
        15 => +{'name' => 'temperature_max', 'scale' => 100, 'unit' => 'deg.C'},
        16 => +{'name' => 'activity_time', 'unit' => 'min'},
        19 => +{'name' => 'active_calories', 'unit' => 'kcal'},
        24 => +{'name' => 'current_activity_type_intensity'}, # complex decoding!
        25 => +{'name' => 'timestamp_min_8', 'unit' => 'min'},
        26 => +{'name' => 'timestamp_16', 'unit' => 's'},
        27 => +{'name' => 'heart_rate', 'unit' => 'bpm'},
        28 => +{'name' => 'intensity', 'scale' => 10},
        29 => +{'name' => 'duration_min', 'unit' => 'min'},
        30 => +{'name' => 'duration', 'unit' => 's'},
        31 => +{'name' => 'ascent', 'scale' => 1000, 'unit' => 'm'},
        32 => +{'name' => 'descent', 'scale' => 1000, 'unit' => 'm'},
        33 => +{'name' => 'moderate_activity_minutes', 'unit' => 'min'},
        34 => +{'name' => 'vigorous_activity_minutes', 'unit' => 'min'},
    },

    'monitoring_hr_data' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},         # Must align to logging interval, for example, time must be 00:00:00 for daily log.
        0 => +{'name' => 'resting_heart_rate', 'unit' => 'bpm'},             # 7-day rolling average
        1 => +{'name' => 'current_day_resting_heart_rate', 'unit' => 'bpm'}, # RHR for today only. (Feeds into 7-day average)
    },

    'spo2_data' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'reading_spo2', 'unit' => 'percent'},
        1 => +{'name' => 'reading_confidence'},
        2 => +{'name' => 'mode', 'type_name' => 'spo2_measurement_type'}, # Mode when data was captured
    },

    'hr' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'fractional_timestamp', 'scale' => 32768, 'unit' => 's'},
        1 => +{'name' => 'time256', 'scale' => 256, 'unit' => 's'},
        6 => +{'name' => 'filtered_bpm', 'unit' => 'bpm'},
        9 => +{'name' => 'event_timestamp', 'scale' => 1024, 'unit' => 's'},
        10 => +{'name' => 'event_timestamp_12', 'scale' => 1024, 'unit' => 's'},
    },

    'stress_level' => +{
        0 => +{'name' => 'stress_level_value'},
        1 => +{'name' => 'stress_level_time', 'type_name' => 'date_time', 'unit' => 's'},
    },

    'max_met_data' => +{
        0  => +{'name' => 'update_time',      'type_name' => 'date_time'},                 # Time maxMET and vo2 were calculated
        2  => +{'name' => 'vo2_max', 'unit' => 'mL/kg/min'},
        5  => +{'name' => 'sport',            'type_name' => 'sport'},
        6  => +{'name' => 'sub_sport',        'type_name' => 'sub_sport'},
        8  => +{'name' => 'max_met_category', 'type_name' => 'max_met_category'},
        9  => +{'name' => 'calibrated_data',  'type_name' => 'bool'},                      # Indicates if calibrated data was used in the calculation
        12 => +{'name' => 'hr_source',        'type_name' => 'max_met_heart_rate_source'}, # Indicates if the estimate was obtained using a chest strap or wrist heart rate
        13 => +{'name' => 'speed_source',     'type_name' => 'max_met_speed_source'},      # Indidcates if the estimate was obtained using onboard GPS or connected GPS
    },

    'hsa_body_battery_data' => +{       # Body battery data used for HSA custom data logging
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'processing_interval', 'unit' => 's'}, # Processing interval length in seconds
        1 => +{'name' => 'level', 'unit' => 'percent'},         # Body battery level
        2 => +{'name' => 'charged' },                           # Body battery charged value
        3 => +{'name' => 'uncharged' },                         # Body battery uncharged value
    },

    'hsa_event' => +{                   # HSA events
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'event_id'},   # Event ID
    },

    'hsa_accelerometer_data' => +{      # Raw accelerometer data used for HSA custom data logging
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},               # Millisecond resolution of the timestamp
        1 => +{'name' => 'sampling_interval', 'unit' => 'ms'},          # Sampling Interval in Milliseconds
        2 => +{'name' => 'accel_x', 'scale' => 1.024, 'unit' => 'mG'},  # X-Axis Measurement
        3 => +{'name' => 'accel_y', 'scale' => 1.024, 'unit' => 'mG'},  # Y-Axis Measurement
        4 => +{'name' => 'accel_z', 'scale' => 1.024, 'unit' => 'mG'},  # Z-Axis Measurement
        5 => +{'name' => 'timestamp_32k'},                              # 32 kHz timestamp
    },

    'hsa_gyroscope_data' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},                   # Millisecond resolution of the timestamp
        1 => +{'name' => 'sampling_interval', 'unit' => '1/32768 s'},       # Sampling Interval in 32 kHz timescale
        2 => +{'name' => 'gyro_x', 'scale' => 28.57143, 'unit' => 'deg/s'}, # X-Axis Measurement
        3 => +{'name' => 'gyro_y', 'scale' => 28.57143, 'unit' => 'deg/s'}, # Y-Axis Measurement
        4 => +{'name' => 'gyro_z', 'scale' => 28.57143, 'unit' => 'deg/s'}, # Z-Axis Measurement
        5 => +{'name' => 'timestamp_32k', 'unit' => '1/32768 s'},           # 32 kHz timestamp
    },

    'hsa_step_data' => +{               # User's current daily step data used for HSA custom data logging
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'processing_interval', 'unit' => 's'}, # Processing interval length in seconds
        1 => +{'name' => 'steps', 'unit' => 'steps'},           # Total step sum
    },

    'hsa_spo2_data' => +{               # User's current SpO2 data used for HSA custom data logging
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'processing_interval', 'unit' => 's'}, # Processing interval length in seconds
        1 => +{'name' => 'reading_spo2', 'unit' => 'percent'},  # SpO2 Reading
        2 => +{'name' => 'confidence'},                         # SpO2 Confidence
    },

    'hsa_stress_data' => +{             # User's current stress data used for HSA custom data logging
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'processing_interval', 'unit' => 's'}, # Processing interval length in seconds
        1 => +{'name' => 'stress_level', 'unit' => 's'},        # Stress Level ( 0 - 100 ) -300 indicates invalid -200 indicates large motion -100 indicates off wrist
    },

    'hsa_respiration_data' => +{        # User's current respiration data used for HSA custom data logging
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'processing_interval', 'unit' => 's'},                         # Processing interval length in seconds
        1 => +{'name' => 'respiration_rate', 'scale' => 100, 'unit' => 'breaths/min'},  # Breaths * 100 /min -300 indicates invalid -200 indicates large motion -100 indicates off wrist
    },

    'hsa_heart_rate_data' => +{         # User's current heart rate data used for HSA custom data logging
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'processing_interval', 'unit' => 's'}, # Processing interval length in seconds
        1 => +{'name' => 'status'},                             # Status of measurements in buffer - 0 indicates SEARCHING 1 indicates LOCKED
        2 => +{'name' => 'heart_rate', 'unit' => 'bpm'},        # Beats / min
    },

    'hsa_configuration_data' => +{      # Configuration data for HSA custom data logging
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'}, # Encoded configuration data
        0 => +{'name' => 'data'},
        1 => +{'name' => 'data_size'},   # Size in bytes of data field
    },

    'hsa_wrist_temperature_data' => +{  # Wrist temperature data used for HSA custom data logging
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'processing_interval', 'unit' => 's'},         # Processing interval length in seconds
        1 => +{'name' => 'value', 'scale' => 1000, 'unit' => 'degC'},   # Wrist temperature reading
    },

    'memo_glob' => +{                   # begins === Other messages === section
        250 => +{'name' => 'part_index'},
        0 => +{'name' => 'memo'},
        1 => +{'name' => 'message_number'},
        2 => +{'name' => 'message_index', 'type_name' => 'message_index'},
    },

    'sleep_level' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'sleep_level', 'type_name' => 'sleep_level'},
    },

    'ant_channel_id' => +{
        0 => +{'name' => 'channel_number'},
        1 => +{'name' => 'device_type'},
        2 => +{'name' => 'device_number'},
        3 => +{'name' => 'transmission_type'},
        4 => +{'name' => 'device_index', 'type_name' => 'device_index'},
    },

    'ant_rx' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'fractional_timestamp', 'scale' => 32768, 'unit' => 's'},
        1 => +{'name' => 'mesg_id'},
        2 => +{'name' => 'mesg_data'},
        3 => +{'name' => 'channel_number'},
        4 => +{'name' => 'data'},
    },

    'ant_tx' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'fractional_timestamp', 'scale' => 32768, 'unit' => 's'},
        1 => +{'name' => 'mesg_id'},
        2 => +{'name' => 'mesg_data'},
        3 => +{'name' => 'channel_number'},
        4 => +{'name' => 'data'},
    },

    'exd_screen_configuration' => +{
        0 => +{'name' => 'screen_index'},
        1 => +{'name' => 'field_count'},
        2 => +{'name' => 'layout', 'type_name' => 'exd_layout'},
        3 => +{'name' => 'screen_enabled', 'type_name' => 'bool'},
    },

    'exd_data_field_configuration' => +{
        0 => +{'name' => 'screen_index'},
        1 => +{'name' => 'concept_field'}, # complex decoding!
        2 => +{'name' => 'field_id'},
        3 => +{'name' => 'concept_count'},
        4 => +{'name' => 'display_type', 'type_name' => 'exd_display_type'},
        5 => +{'name' => 'title'},
    },

    'exd_data_concept_configuration' => +{
        0 => +{'name' => 'screen_index'},
        1 => +{'name' => 'concept_field'}, # complex decoding!
        2 => +{'name' => 'field_id'},
        3 => +{'name' => 'concept_index'},
        4 => +{'name' => 'data_page'},
        5 => +{'name' => 'concept_key'},
        6 => +{'name' => 'scaling'},
        7 => +{'name' => 'unknown7'}, # unknown UINT8
        8 => +{'name' => 'data_units', 'type_name' => 'exd_data_units'},
        9 => +{'name' => 'qualifier', 'type_name' => 'exd_qualifiers'},
        10 => +{'name' => 'descriptor', 'type_name' => 'exd_descriptors'},
        11 => +{'name' => 'is_signed', 'type_name' => 'bool'},
    },

    'dive_summary' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0  => +{'name' => 'reference_mesg', 'type_name' => 'mesg_num'},
        1  => +{'name' => 'reference_index', 'type_name' => 'message_index'},
        2  => +{'name' => 'avg_depth', 'scale' => 1000, 'unit' => 'm'},
        3  => +{'name' => 'max_depth', 'scale' => 1000, 'unit' => 'm'},
        4  => +{'name' => 'surface_interval', 'unit' => 's'},
        5  => +{'name' => 'start_cns', 'unit' => '%'},
        6  => +{'name' => 'end_cns', 'unit' => '%'},
        7  => +{'name' => 'start_n2', 'unit' => '%'},
        8  => +{'name' => 'end_n2', 'unit' => '%'},
        9  => +{'name' => 'o2_toxicity'},
        10 => +{'name' => 'dive_number'},
        11 => +{'name' => 'bottom_time', 'scale' => 1000, 'unit' => 's'},
        12 => +{ 'name' => 'avg_pressure_sac', 'unit' => 'bar/min', 'scale' => 100 },# Average pressure-based surface air consumption
        13 => +{ 'name' => 'avg_volume_sac',   'unit' => 'l/min', 'scale' => 100 },  # Average volumetric surface air consumption
        14 => +{ 'name' => 'avg_rmv',          'unit' => 'l/min', 'scale' => 100 },  # Average respiratory minute volume
        15 => +{ 'name' => 'descent_time',     'unit' => 's', 'scale' => 1000 },     # Time to reach deepest level stop
        16 => +{ 'name' => 'ascent_time',      'unit' => 's', 'scale' => 1000 },     # Time after leaving bottom until reaching surface
        17 => +{ 'name' => 'avg_ascent_rate',  'unit' => 'm/s', 'scale' => 1000 },   # Average ascent rate, not including descents or stops
        22 => +{ 'name' => 'avg_descent_rate', 'unit' => 'm/s', 'scale' => 1000 },   # Average descent rate, not including ascents or stops
        23 => +{ 'name' => 'max_ascent_rate',  'unit' => 'm/s', 'scale' => 1000 },   # Maximum ascent rate
        24 => +{ 'name' => 'max_descent_rate', 'unit' => 'm/s', 'scale' => 1000 },   # Maximum descent rate
        25 => +{ 'name' => 'hang_time',        'unit' => 's', 'scale' => 1000 },     # Time spent neither ascending nor descending
    },

    'aad_accel_features' => +{    # Number of acclerometer zero crossings summed over the specified time interval
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'time', 'unit' => 's'},    # Time interval length in seconds
        1 => +{'name' => 'energy_total'},           # Total accelerometer energy in the interval
        2 => +{'name' => 'zero_cross_cnt'},         # Count of zero crossings
        3 => +{'name' => 'instance'},               # Instance ID of zero crossing algorithm
        4 => +{'name' => 'time_above_threshold', 'scale' => 25, 'unit' => 's'}, # Total accelerometer time above threshold in the interval
    },

    'hrv' => +{ # heart rate variability
        0 => +{'name' => 'time', 'scale' => 1000, 'unit' => 's'},
    },

    'beat_intervals' => +{
        253 => +{ 'name' => 'timestamp', 'type_name' => 'date_time' },
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},     # Milliseconds past date_time
        1 => +{'name' => 'time',         'unit' => 'ms'},     # Array of millisecond times between beats
    },

    'hrv_status_summary' => +{
        253 => +{ 'name' => 'timestamp', 'type_name' => 'date_time' },
        0 => +{'name' => 'weekly_average',          'scale' => 128, 'unit' => 'ms'},      # 5 minute RMSSD
        1 => +{'name' => 'last_night_average',      'scale' => 128, 'unit' => 'ms'},      # 7 day RMSSD average over sleep
        2 => +{'name' => 'last_night_5_min_high',   'scale' => 128, 'unit' => 'ms'},      # Last night RMSSD average over sleep
        3 => +{'name' => 'baseline_low_upper',      'scale' => 128, 'unit' => 'ms'},      # 5 minute high RMSSD value over sleep
        4 => +{'name' => 'baseline_balanced_lower', 'scale' => 128, 'unit' => 'ms'},      # 3 week baseline, upper boundary of low HRV status
        5 => +{'name' => 'baseline_balanced_upper', 'scale' => 128, 'unit' => 'ms'},      # 3 week baseline, lower boundary of balanced HRV status
        6 => +{'name' => 'hrv_status', 'type_name' => 'hrv_status'},
    },

    'hrv_value' => +{
        253 => +{ 'name' => 'timestamp', 'type_name' => 'date_time' },
        0 => +{'name' => 'value', 'scale' => 128, 'unit' => 'ms'},      # 5 minute RMSSD
    },

    'raw_bbi' => +{                     # Raw Beat-to-Beat Interval values
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'timestamp_ms', 'unit' => 'ms'},   # ms since last overnight_raw_bbi message
        1 => +{'name' => 'data'},                           # Complex decoding!
        2 => +{'name' => 'time', 'unit' => 'ms'},           # Array of millisecond times between beats
        3 => +{'name' => 'quality'},
        4 => +{'name' => 'gap'},
    },

    'respiration_rate' => +{
        253 => +{ 'name' => 'timestamp', 'type_name' => 'date_time' },
        0 => +{ 'name' => 'respiration_rate', 'unit' => 'breaths/min', 'scale' => 100 },    # Breaths * 100 /min, -300 indicates invalid, -200 indicates large motion, -100 indicates off wrist
    },

    'chrono_shot_session' => +{         # Specifically used for XERO products.
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'min_speed', 'scale' => 1000, 'unit' => 'm/s'},
        1 => +{'name' => 'max_speed', 'scale' => 1000, 'unit' => 'm/s'},
        2 => +{'name' => 'avg_speed', 'scale' => 1000, 'unit' => 'm/s'},
        3 => +{'name' => 'shot_count'},
        4 => +{'name' => 'projectile_type', 'type_name' => 'projectile_type'},
        5 => +{'name' => 'grain_weight', 'scale' => 10, 'unit' => 'gr'},
    },

    'chrono_shot_data' => +{         # Specifically used for XERO products.
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'shot_speed', 'scale' => 1000, 'unit' => 'm/s'},
        1 => +{'name' => 'shot_num'},
    },

    'tank_update' => +{
        253 => +{ 'name' => 'timestamp', 'type_name' => 'date_time' },
        0 => +{ 'name' => 'sensor',   'type_name' => 'ant_channel_id'   },
        1 => +{ 'name' => 'pressure', 'unit' => 'bar', 'scale' => 100 },
    },

    'tank_summary' => +{
        253 => +{ 'name' => 'timestamp', 'type_name' => 'date_time' },
        0 => +{ 'name' => 'sensor',         'type_name' => 'ant_channel_id' },
        1 => +{ 'name' => 'start_pressure', 'unit' => 'bar', 'scale' => 100 },
        2 => +{ 'name' => 'end_pressure',   'unit' => 'bar', 'scale' => 100 },
        3 => +{ 'name' => 'volume_used',    'unit' => 'l', 'scale' => 100   },
    },

    'sleep_assessment' => +{
        0  => +{ 'name' => 'combined_awake_score' },        # Average of awake_time_score and awakenings_count_score. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        1  => +{ 'name' => 'awake_time_score' },            # Score that evaluates the total time spent awake between sleep. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        2  => +{ 'name' => 'awakenings_count_score' },      # Score that evaluates the number of awakenings that interrupt sleep. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        3  => +{ 'name' => 'deep_sleep_score' },            # Score that evaluates the amount of deep sleep. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        4  => +{ 'name' => 'sleep_duration_score' },        # Score that evaluates the quality of sleep based on sleep stages, heart-rate variability and possible awakenings during the night. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        5  => +{ 'name' => 'light_sleep_score', },          # Score that evaluates the amount of light sleep. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        6  => +{ 'name' => 'overall_sleep_score' },         # Total score that summarizes the overall quality of sleep, combining sleep duration and quality. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        7  => +{ 'name' => 'sleep_quality_score' },         # Score that evaluates the quality of sleep based on sleep stages, heart-rate variability and possible awakenings during the night. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        8  => +{ 'name' => 'sleep_recovery_score' },        # Score that evaluates stress and recovery during sleep. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        9  => +{ 'name' => 'rem_sleep_score' },             # Score that evaluates the amount of REM sleep. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        10 => +{ 'name' => 'sleep_restlessness_score' },    # Score that evaluates the amount of restlessness during sleep. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        11 => +{ 'name' => 'awakenings_count' },            # The number of awakenings during sleep.
        14 => +{ 'name' => 'interruptions_score' },         # Score that evaluates the sleep interruptions. If valid: 0 (worst) to 100 (best). If unknown: FIT_UINT8_INVALID.
        15 => +{ 'name' => 'average_stress_during_sleep' }, # Excludes stress during awake periods in the sleep window
    },

    'skin_temp_overnight' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'local_timestamp', 'type_name' => 'local_date_time'},
        1 => +{'name' => 'average_deviation'},       # The average overnight deviation from baseline temperature in degrees C
        2 => +{'name' => 'average_7_day_deviation'}, # The average 7 day overnight deviation from baseline temperature in degrees C
        4 => +{'name' => 'nightly_value'},           # Final overnight temperature value
    },

    'pad' => +{
        0 => +{'name' => 'pad'},
    },

    'source' => +{                      # begins === Undocumented messages === section
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        # device_index in device_info
        0 => +{'name' => 'unknown0', 'type_name' => 'device_index'}, # unknown UINT8
        1 => +{'name' => 'unknown1', 'type_name' => 'device_index'}, # unknown UINT8
        2 => +{'name' => 'unknown2', 'type_name' => 'device_index'}, # unknown UINT8
        3 => +{'name' => 'unknown3', 'type_name' => 'device_index'}, # unknown UINT8
        4 => +{'name' => 'unknown4', 'type_name' => 'device_index'}, # unknown UINT8
        5 => +{'name' => 'unknown5'}, # unknown ENUM
        6 => +{'name' => 'unknown6'}, # unknown UINT8
        7 => +{'name' => 'unknown7'}, # unknown UINT8
        8 => +{'name' => 'unknown8'}, # unknown UINT8
        9 => +{'name' => 'unknown9'}, # unknown UINT8
    },

    'location' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'name'}, # unknown STRING
        1 => +{'name' => 'position_lat', 'unit' => 'semicircles'}, # unknown SINT32
        2 => +{'name' => 'position_long', 'unit' => 'semicircles'}, # unknown SINT32
        3 => +{'name' => 'unknown3'}, # unknown UINT16 (elevation?)
        4 => +{'name' => 'unknown4'}, # unknown UINT16
        5 => +{'name' => 'unknown5'}, # unknown UINT16
        6 => +{'name' => 'unknown6'}, # unknown STRING
    },

    'battery' => +{
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'unknown0'}, # unknown UINT16 (voltage with scale?)
        1 => +{'name' => 'unknown1'}, # unknown SINT16
        2 => +{'name' => 'charge_level', 'unit' => '%'}, # unknown UINT8
        3 => +{'name' => 'temperature', 'unit' => 'deg.C'}, # unknown SINT8
    },

    'sensor' => +{
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'unknown0'}, # unknown UINT32Z
        1 => +{'name' => 'unknown1'}, # unknown UINT8
        2 => +{'name' => 'sensor_id'}, # unknown STRING
        3 => +{'name' => 'unknown3'}, # unknown ENUM
        4 => +{'name' => 'unknown4'}, # unknown ENUM
        5 => +{'name' => 'unknown5'}, # unknown ENUM
        6 => +{'name' => 'unknown6'}, # unknown ENUM
        7 => +{'name' => 'unknown7'}, # unknown ENUM
        8 => +{'name' => 'unknown8'}, # unknown ENUM
        9 => +{'name' => 'unknown9'}, # unknown UINT8
        10 => +{'name' => 'wheel_size', 'unit' => 'mm'}, # unknown UINT16
        11 => +{'name' => 'unknown11'}, # unknown UINT16
        12 => +{'name' => 'unknown12'}, # unknown UINT8
        13 => +{'name' => 'unknown13'}, # unknown UINT32
        14 => +{'name' => 'unknown14'}, # unknown UINT8
        15 => +{'name' => 'unknown15'}, # unknown UINT8
        16 => +{'name' => 'unknown16'}, # unknown UINT8
        17 => +{'name' => 'unknown17'}, # unknown UINT8Z
        18 => +{'name' => 'unknown18'}, # unknown UINT8Z (array[4])
        19 => +{'name' => 'unknown19'}, # unknown UINT8Z
        20 => +{'name' => 'unknown20'}, # unknown UINT8Z (array[12])
        21 => +{'name' => 'unknown21'}, # unknown UINT16
        25 => +{'name' => 'unknown25'}, # unknown UINT16
        26 => +{'name' => 'unknown26'}, # unknown UINT16
        27 => +{'name' => 'unknown27'}, # unknown UINT8
        28 => +{'name' => 'unknown28'}, # unknown UINT8 (array[4])
        29 => +{'name' => 'unknown29'}, # unknown UINT8 (array[4])
        30 => +{'name' => 'unknown30'}, # unknown UINT8 (array[4])
        31 => +{'name' => 'unknown31'}, # unknown UINT8
        32 => +{'name' => 'unknown32'}, # unknown UINT16
        33 => +{'name' => 'unknown33'}, # unknown UINT16
        34 => +{'name' => 'unknown34'}, # unknown UINT16
        35 => +{'name' => 'unknown35'}, # unknown UINT16
        36 => +{'name' => 'unknown36'}, # unknown ENUM
        37 => +{'name' => 'unknown37'}, # unknown ENUM (array[7])
        38 => +{'name' => 'unknown38'}, # unknown ENUM (array[7])
        39 => +{'name' => 'unknown39'}, # unknown ENUM (array[7])
        40 => +{'name' => 'unknown40'}, # unknown UINT16Z
        41 => +{'name' => 'unknown41'}, # unknown UINT8 (array[7])
        42 => +{'name' => 'unknown42'}, # unknown ENUM
        43 => +{'name' => 'unknown43'}, # unknown ENUM
        44 => +{'name' => 'unknown44'}, # unknown UINT8Z
        47 => +{'name' => 'unknown47'}, # unknown ENUM
        48 => +{'name' => 'unknown48'}, # unknown ENUM
    },

    );

my %msgtype_by_num = (
    13 => +{                     # begins === Unknown messages === section
        '_number' => 13,
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        1 => +{'name' => 'unknown1'}, # unknown ENUM
        2 => +{'name' => 'unknown2'}, # unknown UINT16
        3 => +{'name' => 'unknown3'}, # unknown ENUM
        4 => +{'name' => 'unknown4'}, # unknown UINT32
        5 => +{'name' => 'unknown5'}, # unknown SINT32
        6 => +{'name' => 'unknown6'}, # unknown SINT32
        7 => +{'name' => 'unknown7'}, # unknown ENUM
        8 => +{'name' => 'unknown8'}, # unknown UINT16
        9 => +{'name' => 'unknown9'}, # unknown ENUM
        10 => +{'name' => 'unknown10'}, # unknown UINT16
        11 => +{'name' => 'unknown11'}, # unknown UINT8
        12 => +{'name' => 'unknown12'}, # unknown ENUM
        13 => +{'name' => 'unknown13'}, # unknown ENUM
        14 => +{'name' => 'unknown14'}, # unknown ENUM
        15 => +{'name' => 'unknown15'}, # unknown ENUM
        16 => +{'name' => 'unknown16'}, # unknown ENUM
        17 => +{'name' => 'unknown17'}, # unknown ENUM
        18 => +{'name' => 'unknown18'}, # unknown ENUM
        19 => +{'name' => 'unknown19'}, # unknown UINT16
        25 => +{'name' => 'unknown25'}, # unknown ENUM
        27 => +{'name' => 'unknown27'}, # unknown ENUM
        30 => +{'name' => 'unknown30'}, # unknown ENUM
        31 => +{'name' => 'unknown31'}, # unknown UINT32
        32 => +{'name' => 'unknown32'}, # unknown UINT16
        33 => +{'name' => 'unknown33'}, # unknown UINT32
        34 => +{'name' => 'unknown34'}, # unknown ENUM
        50 => +{'name' => 'unknown50'}, # unknown ENUM
        51 => +{'name' => 'unknown51'}, # unknown ENUM
        52 => +{'name' => 'unknown52'}, # unknown UINT16
        53 => +{'name' => 'unknown53'}, # unknown ENUM
        56 => +{'name' => 'unknown56'}, # unknown ENUM
    },

    14 => +{
        '_number' => 14,
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        1 => +{'name' => 'unknown1'}, # unknown ENUM
        3 => +{'name' => 'unknown3'}, # unknown UINT8
        4 => +{'name' => 'unknown4'}, # unknown UINT8 (array[10])
        5 => +{'name' => 'unknown5'}, # unknown ENUM (array[10])
        6 => +{'name' => 'unknown6'}, # unknown STRING
        7 => +{'name' => 'unknown7'}, # unknown UINT16 (array[10])
    },

    16 => +{
        '_number' => 16,
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        1 => +{'name' => 'unknown1'}, # unknown ENUM
        2 => +{'name' => 'unknown2'}, # unknown UINT32
        3 => +{'name' => 'unknown3'}, # unknown ENUM
    },

    17 => +{
        '_number' => 17,
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        1 => +{'name' => 'unknown1'}, # unknown ENUM
        2 => +{'name' => 'unknown2'}, # unknown ENUM
        3 => +{'name' => 'unknown3'}, # unknown UINT16
        4 => +{'name' => 'unknown4'}, # unknown ENUM
        5 => +{'name' => 'unknown5'}, # unknown UINT16
    },

    70 => +{
        '_number' => 70,
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'unknown0'}, # unknown ENUM
        1 => +{'name' => 'unknown1'}, # unknown ENUM
        2 => +{'name' => 'unknown2'}, # unknown ENUM
        3 => +{'name' => 'unknown3'}, # unknown ENUM
        4 => +{'name' => 'unknown4'}, # unknown ENUM
        5 => +{'name' => 'unknown5'}, # unknown ENUM
        6 => +{'name' => 'unknown6'}, # unknown ENUM
        7 => +{'name' => 'unknown7'}, # unknown ENUM
        8 => +{'name' => 'unknown8'}, # unknown ENUM
        9 => +{'name' => 'unknown9'}, # unknown ENUM
        10 => +{'name' => 'unknown10'}, # unknown ENUM
        11 => +{'name' => 'unknown11'}, # unknown ENUM
        12 => +{'name' => 'unknown12'}, # unknown ENUM
        13 => +{'name' => 'unknown13'}, # unknown ENUM
        14 => +{'name' => 'unknown14'}, # unknown ENUM
        15 => +{'name' => 'unknown15'}, # unknown ENUM
    },

    71 => +{
        '_number' => 71,
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'unknown0'}, # unknown ENUM
        1 => +{'name' => 'unknown1'}, # unknown ENUM
        2 => +{'name' => 'unknown2'}, # unknown ENUM
        3 => +{'name' => 'unknown3'}, # unknown UINT16
        4 => +{'name' => 'unknown4'}, # unknown ENUM
    },

    79 => +{
        '_number' => 79,
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'unknown0'}, # unknown UINT16
        1 => +{'name' => 'unknown1'}, # unknown UINT8
        2 => +{'name' => 'unknown2'}, # unknown UINT8
        3 => +{'name' => 'unknown3'}, # unknown UINT16
        4 => +{'name' => 'unknown4'}, # unknown ENUM
        5 => +{'name' => 'unknown5'}, # unknown ENUM
        6 => +{'name' => 'unknown6'}, # unknown UINT8
        7 => +{'name' => 'unknown7'}, # unknown SINT8
        8 => +{'name' => 'unknown8'}, # unknown UINT16
        9 => +{'name' => 'unknown9'}, # unknown UINT16
        10 => +{'name' => 'unknown10'}, # unknown UINT8
        11 => +{'name' => 'unknown11'}, # unknown UINT16
        12 => +{'name' => 'unknown12'}, # unknown UINT16
        13 => +{'name' => 'unknown13'}, # unknown UINT16
        14 => +{'name' => 'unknown14'}, # unknown UINT8
    },

    113 => +{
        '_number' => 113,
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'unknown0'}, # unknown UINT16
        1 => +{'name' => 'unknown1'}, # unknown ENUM
        2 => +{'name' => 'unknown2'}, # unknown UINT32
        3 => +{'name' => 'unknown3'}, # unknown UINT32
        4 => +{'name' => 'unknown4'}, # unknown UINT32
        5 => +{'name' => 'unknown5'}, # unknown ENUM
    },

    114 => +{
        '_number' => 114,
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'unknown0'}, # unknown UINT16
        1 => +{'name' => 'unknown1'}, # unknown ENUM
        2 => +{'name' => 'unknown2'}, # unknown UINT32
        3 => +{'name' => 'unknown3'}, # unknown UINT32
        4 => +{'name' => 'unknown4'}, # unknown UINT32
        5 => +{'name' => 'unknown5'}, # unknown UINT32
        6 => +{'name' => 'unknown6'}, # unknown UINT32Z
        7 => +{'name' => 'unknown7'}, # unknown UINT32
    },

    139 => +{
        '_number' => 139,
        254 => +{'name' => 'message_index', 'type_name' => 'message_index'},
        0 => +{'name' => 'unknown0'}, # unknown ENUM
        1 => +{'name' => 'unknown1'}, # unknown UINT16Z
        3 => +{'name' => 'unknown3'}, # unknown UINT8Z
        4 => +{'name' => 'unknown4'}, # unknown ENUM
        5 => +{'name' => 'unknown5'}, # unknown UINT16
    },

    140 => +{
        '_number' => 140,
        253 => +{'name' => 'timestamp', 'type_name' => 'date_time'},
        0 => +{'name' => 'unknown0'}, # unknown UINT8
        1 => +{'name' => 'unknown1'}, # unknown UINT8
        2 => +{'name' => 'unknown2'}, # unknown SINT32
        3 => +{'name' => 'unknown3'}, # unknown SINT32
        4 => +{'name' => 'unknown4'}, # unknown UINT8
        5 => +{'name' => 'unknown5'}, # unknown SINT32
        6 => +{'name' => 'unknown6'}, # unknown SINT32
        7 => +{'name' => 'unknown7'}, # unknown SINT32
        8 => +{'name' => 'unknown8'}, # unknown UINT8
        9 => +{'name' => 'unknown9'}, # unknown UINT16
        10 => +{'name' => 'unknown10'}, # unknown UINT16
        11 => +{'name' => 'unknown11'}, # unknown ENUM
        12 => +{'name' => 'unknown12'}, # unknown ENUM
        13 => +{'name' => 'unknown13'}, # unknown UINT8
        14 => +{'name' => 'unknown14'}, # unknown UINT16
        15 => +{'name' => 'unknown15'}, # unknown UINT16
        16 => +{'name' => 'unknown16'}, # unknown UINT16
        17 => +{'name' => 'unknown17'}, # unknown SINT8
        18 => +{'name' => 'unknown18'}, # unknown UINT8
        19 => +{'name' => 'unknown19'}, # unknown UINT8
    },

    203 => +{
        '_number' => 203,
        0 => +{'name' => 'unknown0'}, # unknown ENUM
        1 => +{'name' => 'unknown1'}, # unknown ENUM
        2 => +{'name' => 'unknown2'}, # unknown ENUM
    },

    );

my $mesg_name_vs_num = $named_type{mesg_num};

for my $msgname (keys %msgtype_by_name) {
    my $msgtype = $msgtype_by_name{$msgname};

    $msgtype->{_name} = $msgname;
    $msgtype->{_number} = $mesg_name_vs_num->{$msgname};
    $msgtype_by_num{$msgtype->{_number}} = $msgtype;

    for my $fldnum (grep {/^\d+$/} keys %$msgtype) {
        my $flddesc = $msgtype->{$fldnum};

        $flddesc->{number} = $fldnum;
        $msgtype->{$flddesc->{name}} = $flddesc;
    }
}

=head2 Constructor Methods

=over 4

=item new()

creates a new object and returns it.

=back

=cut

sub new {
    my $class = shift;
    my $self = +{};
    bless $self, $class;
    $self->initialize(@_);

    # defaults
    $self->use_gmtime(1);
    $self->semicircles_to_degree(1);
    return $self
}

=over 4

=item clone()

Returns a copy of a C instance.

C is experimental and support for it may be removed at any time. Use with caution particularly if there are open filehandles, it which case it is recommended to C before cloning.

It also does not return a full deep copy if any callbacks are registered, it creates a reference to them. There is no known way to make deep copies of anonymous subroutines in Perl (if you know of one, please make a pull request).

The main use for c is immediately after C, and C, to create a copy for later use.

=back

=cut

sub clone {
    my $self = shift;

    require Clone;
    my $clone = Clone::clone( $self );
    return $clone
}

=head2 Class methods

=over 4

=item profile_version_string()

returns a string representing the .FIT profile version on which this class based.

=back

=cut

my $profile_current  = '21.141';
my $protocol_current = '2.3';       # is there such a thing as current protocol for the class?
                                    # don't think so, pod was removed for protocol_* above

my $protocol_version_major_shift = 4;
my $protocol_version_minor_mask  = (1 << $protocol_version_major_shift) - 1;
my $protocol_version_header_crc_started = _protocol_version_from_string("1.0");
my $profile_version_scale = 100;

sub _protocol_version_from_string {
    my $s = shift;
    my ($major, $minor) = split /\./, $s, 2;
    return ($major + 0, $minor & $protocol_version_minor_mask) if wantarray;
    return ($major << $protocol_version_major_shift) | ($minor & $protocol_version_minor_mask)
}

sub protocol_version {
    my $self = shift;
    my $version;
    if (@_) { $version = shift }
    else {    $version = _protocol_version_from_string($protocol_current) }
    return ($version >> $protocol_version_major_shift, $version & $protocol_version_minor_mask) if wantarray;
    return $version
}

sub _profile_version_from_string {
    my $str = shift;
    croak '_profile_version_from_string() expects a string as argument' unless $str;
    my ($major, $minor) = split /\./, $str, 2;
    if ($minor >= 100) { $major += 1 }      # kludge to deal with three-digit minor versions
    return $major * $profile_version_scale + $minor % $profile_version_scale
}

sub profile_version {
    my $self = shift;
    my $version;
    if (@_) {
        $version = shift;
        $version = _profile_version_from_string($version) if $version =~ /\./
    } else {    $version = _profile_version_from_string($profile_current) }

    if (wantarray) {
        my $major = int($version / $profile_version_scale);
        my $minor = $version % $profile_version_scale;
        if ($version >= 2200) {             # kludge to deal with three-digit minor versions
            $major -= 1;
            $minor += 100
        }
        return ($major, $minor)
    }
    return $version
}

sub profile_version_string  {
    my $self = shift;
    my @version;
    if (blessed $self) {
        croak 'fetch_header() has not been called yet to obtain the version from the header, call fetch_header() first' unless defined $self->{profile_version};
        croak 'object method expects no arguments' if @_;
        @version = profile_version(undef, $self->{profile_version} )
    } else {
        @version = profile_version(undef, @_)
    }
    return sprintf '%u.%03u', @version
}

sub profile_version_major   { profile_version( @_) };
sub protocol_version_string { sprintf '%u.%u',   ( protocol_version(@_) ) }
sub protocol_version_major  { protocol_version(@_) };

# CRC calculation routine taken from
#   Haruhiko Okumura, C gengo ni yoru algorithm dai jiten (1st ed.), GijutsuHyouronsha 1991.

my $crc_poly = 2 ** 16 + 2 ** 15 + 2 ** 2 + 2 ** 0; # CRC-16
my ($crc_poly_deg, $crc_poly_rev);
my ($x, $y, $i);
for ($crc_poly_deg = 0, $x = $crc_poly ; $x >>= 1 ;) {
    ++$crc_poly_deg;
}
my $crc_octets = int($crc_poly_deg / 8 + 0.5);
for ($crc_poly_rev = 0, $y = 1, $x = 2 ** ($crc_poly_deg - 1) ; $x ;) {
    $crc_poly_rev |= $y if $x & $crc_poly;
    $y <<= 1;
    $x >>= 1;
}
my @crc_table = ();
for ($i = 0 ; $i < 2 ** 8 ; ++$i) {
    my $r = $i;
    my $j;
    for ($j = 0 ; $j < 8 ; ++$j) {
        if ($r & 1) {
            $r = ($r >> 1) ^ $crc_poly_rev;
        } else {
            $r >>= 1;
        }
    }
    $crc_table[$i] = $r;
}

# delete
sub dump {
    my ($self, $s, $fh) = @_;
    my ($i, $d);
    for ($i = 0 ; $i < length($s) ;) {
        $fh->printf(' %03u', ord(substr($s, $i++, 1)));
    }
}

# delete
sub safe_isa {
    eval {$_[0]->isa($_[1])};
}

# make internal
# move to a section on internal accessors
sub file_read {
    my $self = shift;
    if (@_) {
        $self->{file_read} = $_[0];
    } else {
        $self->{file_read};
    }
}

# make internal (or add POD)
# move to a section on internal accessors (or to object methods)
sub file_size {
    my $self = shift;
    if (@_) {
        $self->{file_size} = $_[0];
    } else {
        $self->{file_size};
    }
}

# make internal (or add POD)
# move to a section on internal accessors (or to object methods)
sub file_processed {
    my $self = shift;
    if (@_) {
        $self->{file_processed} = $_[0];
    } else {
        $self->{file_processed};
    }
}

# make internal
# move to a section on internal accessors
sub offset {
    my $self = shift;
    if (@_) {
        $self->{offset} = $_[0];
    } else {
        $self->{offset};
    }
}

# make internal
# move to a section on internal accessors
sub buffer {
    my $self = shift;
    if (@_) {
        $self->{buffer} = $_[0];
    } else {
        $self->{buffer};
    }
}

# make internal
# move to a section on internal accessors
sub maybe_chained {
    my $self = shift;
    if (@_) {
        $self->{maybe_chained} = $_[0];
    } else {
        $self->{maybe_chained};
    }
}

# make internal
# move to a section on internal methods
sub clear_buffer {
    my $self = shift;
    if ($self->offset > 0) {
        my $buffer = $self->{buffer};
        $self->crc_calc(length($$buffer)) if !defined $self->crc;
        $self->file_processed($self->file_processed + $self->offset);
        substr($$buffer, 0, $self->offset) = '';
        $self->offset(0)
    }
    return 1
}

=head2 Object methods

=over 4

=item file( $filename )

returns the name of a .FIT file. Sets the name to I<$filename> if called with an argument (raises an exception if the file does not exist).

=back

=cut

sub file {
    my $self = shift;
    if (@_) {
        my $fname = $_[0];
        croak "file $fname specified in file() does not exist: $!" unless -f $fname;
        $self->{file} = $fname
    }
    return $self->{file}
}

=over 4

=item open()

opens the .FIT file.

=back

=cut

sub open {
    my $self = shift;
    my $fn = $self->file;

    if ($fn ne '') {
        my $fh = $self->fh;

        if ($fh->open("< $fn")) {
            if (binmode $fh, ':raw') {
                1;
            } else {
                $self->error("binmode \$fh, ':raw': $!");
            }
        } else {
            $self->error("\$fh->open(\"< $fn\"): $!");
        }
    } else {
        $self->error('no file name given');
    }
}

# make internal
# move to a section on internal accessors
sub fh {
    my $self = shift;
    if (@_) {
        $self->{fh} = $_[0];
    } else {
        $self->{fh};
    }
}

# make internal
# move to a section on internal accessors
sub EOF {
    my $self = shift;
    if (@_) {
        $self->{EOF} = $_[0];
    } else {
        $self->{EOF};
    }
}

# make internal
# move to a section on internal accessors
sub end_of_chunk {
    my $self = shift;
    if (@_) {
        $self->{end_of_chunk} = $_[0];
    } else {
        $self->{end_of_chunk};
    }
}

# make internal
# move to a section on internal functions
sub fill_buffer {
    my $self = shift;
    my $buffer = $self->buffer;
    croak 'fill_buffer() expects no argument' if @_;

    $self->clear_buffer;

    my $n = $self->fh->read($$buffer, BUFSIZ, length($$buffer));

    if ($n > 0) {
        $self->file_read($self->file_read + $n);

        if (defined $self->file_size) {
            if (defined $self->crc) {
                $self->crc_calc($n);
            } else {
                $self->crc_calc(length($$buffer));
            }
        }
    } else {
        if (defined $n) {
            $self->error("unexpected EOF");
            $self->EOF(1);
        } else {
            $self->error("read(fh): $!");
        }
        return undef
    }
    return 1
}

# move to a section on internal functions
sub _buffer_needs_updating {
    my ($self, $bytes_needed) = @_;
    my ($buffer, $offset) = ($self->buffer, $self->offset);     # easier to debug with variables
    if  ( length($$buffer) - $offset < $bytes_needed ) { return 1 }
    else { return 0 }
}

my $header_template = 'C C v V V';
my $header_length = length(pack($header_template));

sub FIT_HEADER_LENGTH {
    $header_length;
}

my $FIT_signature_string = '.FIT';
my $FIT_signature = unpack('V', $FIT_signature_string);

my $header_crc_template = 'v';
my $header_crc_length = length(pack($header_crc_template));

=over 4

=item fetch_header()

reads .FIT file header, and returns an array of the file size (excluding the trailing CRC-16), the protocol version, the profile version, extra octets in the header other than documented 4 values, the header CRC-16 recorded in the header, and the calculated header CRC-16.

=back

=cut

sub fetch_header {
    my $self = shift;
    croak 'call the open() method before fetching the header' if $self->fh->tell < 0;
    croak '.FIT file header has already been fetched'         if $self->fh->tell > 0;

    my $buffer = $self->buffer;

    if ( $self->_buffer_needs_updating( $header_length ) ) {
        $self->fill_buffer or return undef
    }
    my $h_min = substr($$buffer, $self->offset, $header_length);
    my ($h_len, $proto_ver, $prof_ver, $f_len, $sig) = unpack($header_template, $h_min);
    my $f_size = $f_len + $h_len;
    $self->offset($self->offset + $header_length);

    my ($extra, $header_extra_bytes, $crc_expected, $crc_calculated);
    $header_extra_bytes = $h_len - $header_length;   # headers are now typically 14 bytes instead of 12

    if ($header_extra_bytes < 0) {
        $self->error("not a .FIT header ($h_len < $header_length)");
        return ()
    }

    if ($header_extra_bytes) {
        if ( $self->_buffer_needs_updating( $header_extra_bytes ) ) {
            $self->fill_buffer or return undef
        }
        $extra = substr($$buffer, $self->offset, $header_extra_bytes );
        $self->offset($self->offset + $header_extra_bytes );
    }

    if ($sig != $FIT_signature) {
        $self->error("not a .FIT header (" .
                join('', map {($_ ne "\\" && 0x20 >= ord($_) && ord($_) <= 0x7E) ? $_ : sprintf("\\x%02X", ord($_))} split //, pack('V', $sig))
                . " ne '$FIT_signature_string')");
        return ()
    }

    if ($proto_ver >= $protocol_version_header_crc_started && length($extra) >= $header_crc_length) {
        $crc_expected = unpack($header_crc_template, substr($extra, -$header_crc_length));
        substr($extra, -$header_crc_length) = '';
        $crc_calculated = $self->crc_of_string(0, \$h_min, 0, $header_length);
    }

    $self->file_size($f_size);
    unless (defined $self->crc) {
        $self->crc(0);
        $self->crc_calc(length($$buffer));
    }

    $self->{profile_version} = $prof_ver;
    return ($f_size, $proto_ver, $prof_ver, $extra, $crc_expected, $crc_calculated)
}

=over 4

=item fetch()

reads a message in the .FIT file, and returns C<1> on success, or C on failure or EOF. C must have been called before the first attempt to C after opening the file.

If a data message callback is registered, C will return the value returned by the callback. It is therefore important to define explicit return statements and values in any callback (this includes returning true if that is the desired outcome after C).

=back

=cut

sub fetch {
    my $self = shift;
    croak 'call the fetch_header() method before calling fetch()' if $self->fh->tell == 0;
    croak 'open() and fetch_header() methods need to be called before calling fetch()' if $self->fh->tell < 0;

    my $buffer = $self->buffer;

    if ( $self->_buffer_needs_updating( $crc_octets ) ) {
        $self->fill_buffer or return undef
    }
    my $i = $self->offset;
    my $j = $self->file_processed + $i;

    my $ret_val;

    if ($j < $self->file_size) {
        my $record_header = ord(substr($$buffer, $i, 1));
        my $local_msg_type;

        if ($record_header & $rechd_mask_compressed_timestamp_header) {
            $local_msg_type = ($record_header & $rechd_mask_cth_local_message_type) >> $rechd_offset_cth_local_message_type
        } elsif ($record_header & $rechd_mask_definition_message) {
            $ret_val = $self->fetch_definition_message;     # always 1
            return $ret_val
        } else {
            $local_msg_type = $record_header & $rechd_mask_local_message_type
        }

        my $desc = $self->data_message_descriptor->[$local_msg_type];

        if (ref $desc eq 'HASH') {
            $ret_val = $self->fetch_data_message($desc)
        } else {
            $ret_val = $self->error(sprintf("%d at %ld: not defined", $record_header, $j))
        }
    } elsif (!$self->maybe_chained && $j > $self->file_size) {
        $self->trailing_garbages($self->trailing_garbages + length($$buffer) - $i);
        $self->offset(length($$buffer));
        $ret_val = 1
    } else {
        $self->crc_calc(length($$buffer)) if !defined $self->crc;

        my ($crc_expected, $k);

        for ($crc_expected = 0, $k = $crc_octets ; $k > 0 ;) {
            $crc_expected = ($crc_expected << 8) + ord(substr($$buffer, $i + --$k, 1));
        }

        $self->crc_expected($crc_expected);
        $self->offset($i + $crc_octets);
        $self->end_of_chunk(1);
        $ret_val = !$self->maybe_chained
    }
    return $ret_val
}

sub error_callback {            # consider adding POD for error_callback otherwise make it internal (_error_callback)
    my $self = shift;
    if (@_) {
        # if (&safe_isa($_[0], 'CODE')) {
        if (ref $_[0] and ref $_[0] eq 'CODE') {
            $self->{error_callback_argv} = [@_[1 .. $#_]];
            $self->{error_callback} = $_[0];
        } else {
            undef;
        }
    } else {
        $self->{error_callback};
    }
}

=over 4

=item error()

returns an error message recorded by a method.

=back

=cut

sub error {
    my $self = shift;
    if (@_) {
        my ($p, $fn, $l, $subr, $fit);

        (undef, $fn, $l) = caller(0);
        ($p, undef, undef, $subr) = caller(1);
        $fit = $self->file;
        $fit .= ': ' if $fit ne '';

        $self->{error} = "${p}::$subr\#$l\@$fn: $fit$_[0]";

        # if (&safe_isa($self->{error_callback}, 'CODE')) {
        #      my $argv = &safe_isa($self->{error_callback_argv}, 'ARRAY') ? $self->{error_callback_argv} : [];
        my $is_cb = $self->{error_callback};
        my $is_cb_argv = $self->{error_callback_argv};
        if (ref $is_cb and ref $is_cb eq 'CODE') {
            my $argv = (ref $is_cb_argv and ref $is_cb_argv eq 'ARRAY') ? $is_cb_argv : [];

            $self->{error_callback}->($self, @$argv);
        } else {
            undef;
        }
    } else {
        $self->{error};
    }
}

=over 4

=item crc()

CRC-16 calculated from the contents of a .FIT file.

=back

=cut

sub crc {
    my $self = shift;
    if (@_) {
        $self->{crc} = $_[0];
    } else {
        $self->{crc};
    }
}

sub crc_of_string {
    my ($self, $crc, $p, $b, $n) = @_;
    my $e = $b + $n;
    while ($b < $e) {
        $crc = ($crc >> 8) ^ $crc_table[($crc & (2 ** 8 - 1)) ^ ord(substr($$p, $b++, 1))];
    }
    $crc;
}

sub crc_calc {
    my ($self, $m) = @_;
    my $over = $self->file_read - $self->file_size;
    $over = 0 if $over < 0;

    if ($m > $over) {
        my $buffer = $self->buffer;
        $self->crc($self->crc_of_string($self->crc, $buffer, length($$buffer) - $m, $m - $over));
    }
}

=over 4

=item crc_expected()

CRC-16 attached to the end of a .FIT file. Only available after all contents of the file has been read.

=back

=cut

sub crc_expected {
    my $self = shift;
    if (@_) {
        $self->{crc_expected} = $_[0];
    } else {
        $self->{crc_expected};
    }
}

=over 4

=item trailing_garbages()

number of octets after CRC-16, 0 usually.

=back

=cut

sub trailing_garbages {
    my $self = shift;
    if (@_) {
        $self->{trailing_garbages} = $_[0];
    } else {
        $self->{trailing_garbages};
    }
}

sub numeric_date_time {
    my $self = shift;
    if (@_) {
        $self->{numeric_date_time} = $_[0];
    } else {
        $self->{numeric_date_time};
    }
}

sub date_string {
    my ($self, $time) = @_;
    my ($s, $mi, $h, $d, $mo, $y, $gmt) = $self->use_gmtime ? ((gmtime($time))[0 .. 5], 'Z') : (localtime($time))[0 .. 5];
    sprintf('%04u-%02u-%02uT%02u:%02u:%02u%s', $y + 1900, $mo + 1, $d, $h, $mi, $s, $gmt);
}

sub named_type_value {
    my ($self, $type_name, $val) = @_;
    my $typedesc = $named_type{$type_name};

    if (ref $typedesc ne 'HASH') {
        $self->error("$type_name is not a named type");
    } elsif ($typedesc->{_mask}) {
        if ($val !~ /^[-+]?\d+$/) {
            my $num = 0;

            for my $expr (split /,/, $val) {
                $expr =~ s/^.*=//;

                if ($expr =~ s/^0[xX]//) {
                    $num |= hex($expr);
                } else {
                    $num |= $expr + 0;
                }
            }

            $num;
        } else {
            my $mask = 0;
            my @key;

            for my $key (sort {$typedesc->{$b} <=> $typedesc->{$a}} grep {/^[A-Za-z]/} keys %$typedesc) {
                push @key, $key . '=' . ($val & $typedesc->{$key});
                $mask |= $typedesc->{$key};
            }

            my $rest = $val & ~$mask & ((1 << ($size[$typedesc->{_base_type}] * 8)) - 1);

            if ($rest) {
                my $width = $size[$typedesc->{_base_type}] * 2;

                join(',', @key, sprintf("0x%0${width}X", $rest));
            } elsif (@key) {
                join(',', @key);
            } else {
                0;
            }
        }
    } elsif ($type_name eq 'date_time') {
        if ($val !~ /^[-+]?\d+$/) {
            my ($y, $mo, $d, $h, $mi, $s, $gmt) = $val =~ /(\d+)\D+(\d+)\D+(\d+)\D+(\d+)\D+(\d+)\D+(\d+)([zZ]?)/;

            ($gmt ne '' ? timegm($s, $mi, $h, $d, $mo - 1, $y - 1900) : timelocal($s, $mi, $h, $d, $mo - 1, $y - 1900)) + $typedesc->{_offset};
        } elsif ($val >= $typedesc->{_min} && $val != $invalid[$typedesc->{_base_type}]) {
            if ($self->numeric_date_time) {
                $val - $typedesc->{_offset};
            } else {
                $self->date_string($val - $typedesc->{_offset});
            }
        } else {
            undef;
        }
    } else {
        $typedesc->{$val};
    }
}

sub data_message_descriptor {
    my $self = shift;

    if (@_) {
        $self->{data_message_descriptor} = $_[0];
    } else {
        $self->{data_message_descriptor} = [] if ref $self->{data_message_descriptor} ne 'ARRAY';
        $self->{data_message_descriptor};
    }
}

sub data_message_callback {
    $_[0]->{data_message_callback};
}

=over 4

=item data_message_callback_by_num(I, I[, I, ...])

register a function I which is called when a data message with the messag number I is fetched.

=back

=cut

my $msgnum_anon = $invalid[FIT_UINT16];
my $msgname_anon = '';

sub data_message_callback_by_num {
    my $self = shift;
    my $num = shift;
    my $cbmap = $self->data_message_callback;
    my ($msgtype, $name);

    if ($num == $msgnum_anon) {
        if (@_) {
            if (ref $_[0] eq 'CODE') {
                $cbmap->{$msgname_anon} = $cbmap->{$msgnum_anon} = [@_];
            } else {
                $self->error('not a CODE');
            }
        } else {
            my %res;
            foreach $num (keys %msgtype_by_num) {
                my $cb = $cbmap->{$num};
                ref $cb eq 'ARRAY' and $res{$num} = [@$cb];
            }
            \%res;
        }
    } elsif (!defined($msgtype = $msgtype_by_num{$num})) {
        $self->error("$num is not a message type number");
    } elsif (@_) {
        if (ref $_[0] eq 'CODE') {
            $cbmap->{$num} = [@_];
            $msgtype->{_name} ne '' and $cbmap->{$msgtype->{_name}} = $cbmap->{$num};
            $cbmap->{$num};
        } else {
            $self->error('not a CODE');
        }
    } else {
        my $cb = $cbmap->{$num};
        ref $cb eq 'ARRAY' ? [@$cb] : [];
    }
}

=over 4

=item data_message_callback_by_name(I, I[, I, ...])

register a function I which is called when a data message with the name I is fetched.

=back

=cut

sub data_message_callback_by_name {
    my $self = shift;
    my $name = shift;
    my $cbmap = $self->data_message_callback;
    my $msgtype;

    if ($name eq $msgname_anon) {
        if (@_) {
            if (ref $_[0] eq 'CODE') {
                $cbmap->{$msgname_anon} = $cbmap->{$msgnum_anon} = [@_];
            } else {
                $self->error('not a CODE');
            }
        } else {
            my %res;
            foreach $name (keys %msgtype_by_name) {
                my $cb = $cbmap->{$name};
                ref $cb eq 'ARRAY' and $res{$name} = [@$cb];
            }
            \%res;
        }
    } elsif (!defined($msgtype = $msgtype_by_name{$name})) {
        $self->error("$name is not a message type name");
    } elsif (@_) {
        if (ref $_[0] eq 'CODE') {
            $cbmap->{$msgtype->{_number}} = $cbmap->{$name} = [@_];
        } else {
            $self->error('not a CODE');
        }
    } else {
        my $cb = $cbmap->{$name};
        ref $cb eq 'ARRAY' ? [@$cb] : [];
    }
}

sub undocumented_field_name {
    my ($self, $index, $size, $type, $i_string) = @_;
# 'xxx' . $i_string . '_' . $index . '_' . $size . '_' . $type;
    'xxx' . $index;
}

sub syscallback_devdata_id {
    my ($self, $desc, $v) = @_;
    my ($i_id, $T_id, $c_id, $i_index) = @$desc{qw(i_application_id T_application_id c_application_id i_developer_data_index)};
    my ($emsg, $warn);

    if (!defined $i_id) {
        $emsg = "no application_id";
        $warn = 1;
    } elsif ($T_id != FIT_UINT8 && $T_id != FIT_BYTE) {
        croak "There is a bug here, this should be resolved soon";
        # $type_name has not been declared in this scope need to figure out what it should be
        # $emsg = "base type of application_id is $type_name [$T_id] ($T_id)";
    } elsif (!defined $i_index) {
        $emsg = "no developer_data_index";
    }

    if ($emsg ne '') {
        if ($warn) {
            $self->error("suspicious developer data id message ($emsg)");
        } else {
            $self->error("broken developer data id message ($emsg)");
            return undef;
        }
    }

    my $devdata_by_index = $self->{devdata_by_index};
    ref $devdata_by_index eq 'HASH' or $devdata_by_index = $self->{devdata_by_index} = +{};

    my $devdata_by_id = $self->{devdata_by_id};
    ref $devdata_by_id eq 'HASH' or $devdata_by_id = $self->{devdata_by_id} = +{};

    my $id;
    if ($T_id == FIT_UINT8) {
        $id = pack('C*', @$v[$i_id .. ($i_id + $c_id - 1)]);
    } else {
        $id = $v->[$i_id];
    }

    my %devdata = (id => $id, index => $v->[$i_index]);
    $devdata_by_id->{$devdata{id}} = $devdata_by_index->{$devdata{index}} = \%devdata;
}

sub syscallback_devdata_field_desc {
    my ($self, $desc, $v) = @_;

    my ($i_index, $I_index, $i_field_num, $I_field_num,
        $i_base_type_id, $T_base_type_id, $I_base_type_id,
        $i_field_name, $T_field_name, $c_field_name)
        = @$desc{qw(i_developer_data_index I_developer_data_index i_field_definition_number I_field_definition_number
                    i_fit_base_type_id T_fit_base_type_id I_fit_base_type_id
                    i_field_name T_field_name c_field_name)};

    my ($emsg, $warn, $o_name);

    if (!defined $i_index) {
        $emsg = 'no developer_data_index';
    } elsif (!defined $i_field_num) {
        $emsg = 'no field_num';
    } elsif (!defined $i_base_type_id) {
        $emsg = 'no base_type_id';
    } elsif ($T_base_type_id != FIT_UINT8) {
        croak "There is a bug here, this should be resolved soon";
        # $type_name has not been declared in this scope need to figure out what it should be
        # $emsg = "base type of base_type_id is $type_name [$T_base_type_id] ($T_base_type_id)";
    } elsif (!defined $i_field_name) {
        $emsg = 'no field_name';
        $warn = 1;
    } elsif ($T_field_name != FIT_STRING || $c_field_name <= 0) {
        $emsg = "field_name is not a non-empty string";
        $warn = 1;
    } else {
        $o_name = _string_value($v, $i_field_name, $c_field_name);
    }

    if ($emsg ne '') {
        if ($warn) {
            $self->error("suspicious field description message ($emsg)");
        } else {
            $self->error("broken field description message ($emsg)");
            return undef;
        }
    }

    my $base_type = $v->[$i_base_type_id];

    if ($base_type == $I_base_type_id) {
        $self->error("invalid base type ($base_type)");
        return undef;
    }

    if ($base_type < 0) {
        $self->error("unknown base type ($base_type)");
        return undef;
    }

    $base_type &= $deffld_mask_type;

    unless ($base_type <= FIT_BASE_TYPE_MAX) {
        $self->error("unknown base type ($base_type)");
        return undef;
    }

    my $devdata_by_index = $self->{devdata_by_index};

    unless (ref $devdata_by_index eq 'HASH') {
        $self->error('no developer data id message before a field description message');
        return undef;
    }

    my $index = $v->[$i_index];

    if ($index == $I_index) {
        $self->error("invalid developer data index ($index)");
        return undef;
    }

    my $num = $v->[$i_field_num];

    if ($num == $I_field_num) {
        $self->error("invalid field definition number ($num)");
        return undef;
    }

    my $devdata = $devdata_by_index->{$index};

    unless (ref $devdata eq 'HASH') {
        $self->error("No developer data id message with the index $index before a field description message");
        return undef;
    }

    my $field_desc_by_num = $devdata->{field_desc_by_num};
    ref $field_desc_by_num eq 'HASH' or $field_desc_by_num = $devdata->{field_desc_by_num} = +{};

    my $field_desc_by_name = $devdata->{field_desc_by_name};
    ref $field_desc_by_name eq 'HASH' or $field_desc_by_name = $devdata->{field_desc_by_name} = +{};

    my $name = $o_name;

    if (defined $name) {
        $name =~ s/\s+/_/g;
        $name =~ s/\W/sprintf('_%02x_', ord($&))/ge;
    }

    my %fdesc = (
        '_index' => $index,
        '_num' => $num,
        '_name' => $name,
        'field_name' => $o_name,
        '_type' => $base_type,
        );

    for my $i_aname (grep {/^i_/} keys %$desc) {
        if ($i_aname !~ /^i_(developer_data_index|field_definition_number|fit_base_type_id|field_name)$/) {
            my $i = $desc->{$i_aname};
            my $aname = $i_aname;

            $aname =~ s/^i_//;

            my $I_aname = 'I_' . $aname;
            my $T_aname = 'T_' . $aname;
            my $c_aname = 'c_' . $aname;

            if ($desc->{$T_aname} == FIT_STRING) {
                $fdesc{$aname} = _string_value($v, $i, $desc->{$c_aname});
            } elsif ($v->[$i] != $desc->{$I_aname}) {
                $fdesc{$aname} = $v->[$i];
            }
        }
    }

    defined $name and $field_desc_by_name->{$name} = \%fdesc;
    $field_desc_by_num->{$num} = \%fdesc;
}

sub add_endian_converter {
    my ($self, $endian, $type, $c, $i_string, $cvt) = @_;

    if ($endian != $my_endian && $size[$type] > 1) {
        my ($p, $unp, $n);

        if ($size[$type] == 2) {
            ($p, $unp) = (qw(n v));
        } elsif ($size[$type] == 4) {
            ($p, $unp) = (qw(N V));
        } else {
            ($p, $unp, $n) = (qw(N V), 2);
        }

        push @$cvt, $p . $n, $unp . $n, $i_string, $size[$type], $c;
        1;
    } else {
        0;
    }
}

sub fetch_definition_message {
    my $self = shift;
    my $buffer = $self->buffer;

    if ( $self->_buffer_needs_updating( $defmsg_min_length ) ) {
        $self->fill_buffer or return undef
    }
    my $i = $self->offset;
    my ($record_header, $reserved, $endian, $msgnum, $nfields) = unpack($defmsg_min_template, substr($$buffer, $i, $defmsg_min_length));

    $endian = $endian ? 1 : 0;
    $self->offset($i + $defmsg_min_length);

    my $len = $nfields * $deffld_length;

    if ( $self->_buffer_needs_updating( $len ) ) {
        $self->fill_buffer or return undef
    }
    $i = $self->offset;
    $msgnum = unpack('n', pack('v', $msgnum)) if $endian != $my_endian;

    my $msgtype = $msgtype_by_num{$msgnum};
    my $cbmap = $self->data_message_callback;
    my $e = $i + $len;
    my ($cb, %desc, $i_array, $i_array_t, $i_string, @cvt, @pi);

    $desc{local_message_type} = $record_header & $rechd_mask_local_message_type;
    $desc{message_number} = $msgnum;
    $desc{message_name} = $msgtype->{_name} if ref $msgtype eq 'HASH' && exists $msgtype->{_name};
    $cb = $cbmap->{$msgnum} if ref $cbmap->{$msgnum} eq 'ARRAY';
    $cb = $cbmap->{$msgnum_anon} if ref $cb ne 'ARRAY';
    $desc{callback} = $cb if ref $cb eq 'ARRAY';
    $desc{endian} = $endian;
    $desc{template} = 'C';
    $self->data_message_descriptor->[$desc{local_message_type}] = \%desc;

    for ($i_array = $i_array_t = $i_string = 1 ; $i + $deffld_length <= $e ; $i += $deffld_length) {
        my ($index, $size, $type) = unpack($deffld_template, substr($$buffer, $i, $deffld_length));
        my ($name, $tname, %attr, );

        if (ref $msgtype eq 'HASH') {
            my $fldtype = $msgtype->{$index};

            if (ref $fldtype eq 'HASH') {
                %attr = %$fldtype;
                ($name, $tname) = @attr{qw(name type_name)};
                delete $attr{name};
                delete $attr{type_name};
            }
        }

        $name = $self->undocumented_field_name($index, $size, $type, $i_string) if !defined $name;
        $desc{$index} = $name;
        $type &= $deffld_mask_type;

        my $c = int($size / $size[$type] + 0.5);

        $desc{'i_' . $name} = $i_array;
        $desc{'o_' . $name} = $i_string;
        $desc{'c_' . $name} = $c;
        $desc{'s_' . $name} = $size[$type];
        $desc{'a_' . $name} = \%attr if %attr;
        $desc{'t_' . $name} = $tname if defined $tname;
        $desc{'T_' . $name} = $type;
        $desc{'N_' . $name} = $index;
        $desc{'I_' . $name} = $invalid[$type];

        $self->add_endian_converter($endian, $type, $c, $i_string, \@cvt);

        $i_array += $c;
        $i_string += $size;
        $desc{template} .= ' ' . $template[$type];

        if ($packfactor[$type] > 1) {
            push @pi, $i_array_t, $c, $i_array;
            $c *= $packfactor[$type];
        }

        $desc{template} .= $c if $c > 1;
        $i_array_t += $c;
    }

    $desc{template_without_devdata} = $desc{template};
    $desc{devdata_first} = $i_array;
    $desc{devdata_nfields} = 0;

    if ($record_header & $rechd_mask_devdata_message) {
        $self->offset($e);
        if ( $self->_buffer_needs_updating( $devdata_min_length ) ) {
            $self->fill_buffer or return undef
        }
        $i = $self->offset;
        ($nfields) = unpack($devdata_min_template, substr($$buffer, $i, $devdata_min_length));

        $self->offset($i + $devdata_min_length);
        $len = $nfields * $devdata_deffld_length;
        if ( $self->_buffer_needs_updating( $len ) ) {
            $self->fill_buffer or return undef
        }

        my $devdata_by_index = $self->{devdata_by_index};
        my @emsg;

        if (ref $devdata_by_index ne 'HASH') {
            push @emsg, 'No developer data id';
            $devdata_by_index = +{};
        }

        for ($i = $self->offset, $e = $i + $len ; $i + $devdata_deffld_length <= $e ; $i += $devdata_deffld_length) {
            my ($fnum, $size, $index) = unpack($devdata_deffld_template, substr($$buffer, $i, $devdata_deffld_length));
            my $devdata = $devdata_by_index->{$index};
            my ($fdesc, $name, $type, %attr);

            if (ref $devdata eq 'HASH') {
                my $fdesc_by_num = $devdata->{field_desc_by_num};

                if (ref $fdesc_by_num eq 'HASH') {
                    $fdesc = $fdesc_by_num->{$fnum};
                } else {
                    push @emsg, "No field description message for developer data with index $index";
                }
            } else {
                push @emsg, "No developer data id with index $index";
            }

            if (ref $fdesc eq 'HASH') {
                %attr = %$fdesc;
                ($type, $name) = @attr{qw(_type _name)};
            } else {
                push @emsg, "No field with number $fnum for developer data with index $index";
                $type = FIT_UINT8;
            }

            $name = $self->undocumented_field_name($fnum, $size, $type, $i_string) if !defined $name;
            $name = "${index}_${fnum}_$name";

            my $c = int($size / $size[$type] + 0.5);

            $desc{'i_' . $name} = $i_array;
            $desc{'o_' . $name} = $i_string;
            $desc{'c_' . $name} = $c;
            $desc{'s_' . $name} = $size[$type];
            $desc{'a_' . $name} = \%attr if %attr;
            $desc{'T_' . $name} = $type;
            $desc{'N_' . $name} = $fnum;
            $desc{'I_' . $name} = $invalid[$type];

            $self->add_endian_converter($endian, $type, $c, $i_string, \@cvt);

            $i_array += $c;
            $i_string += $size;
            $desc{template} .= ' ' . $template[$type];

            if ($packfactor[$type] > 1) {
                push @pi, $type, $i_array_t, $c, $i_array;
                $c *= $packfactor[$type];
            }

            $desc{template} .= $c if $c > 1;
            $i_array_t += $c;
        }

        $desc{devdata_nfields} = $nfields;
        $self->error(join(' / ', @emsg)) if (@emsg);
    }

    $desc{endian_converter} = \@cvt if @cvt;
    $desc{packfilter_index} = \@pi if @pi;
    $desc{message_length} = $i_string;
    $desc{array_length} = $i_array;
    $self->offset($e);
    return 1
}

sub endian_convert {
    my ($self, $cvt, $buffer, $i) = @_;
    my $j;

    for ($j = 4 ; $j < @$cvt ; $j += 5) {
        my ($b, $size, $c) = @$cvt[$j - 2, $j - 1, $j];

        for ($b += $i ; $c > 0 ; $b += $size, --$c) {
            my @v = unpack($cvt->[$j - 3], substr($$buffer, $b, $size));
            my ($k, $l);

            for ($k = 0, $l = $#v ; $k < $l ; ++$k, --$l) {
                @v[$k, $l] = @v[$l, $k];
            }
            substr($$buffer, $b, $size) = pack($cvt->[$j - 4], @v);
        }
    }
}

sub last_timestamp {
    my $self = shift;
    if (@_) {
        $self->{last_timestamp} = $_[0];
    } else {
        $self->{last_timestamp};
    }
}

sub fetch_data_message {
    my ($self, $desc) = @_;
    my $buffer = $self->buffer;

    if ( $self->_buffer_needs_updating( $desc->{message_length} ) ) {
        $self->fill_buffer or return undef
    }
    $self->endian_convert($desc->{endian_converter}, $self->buffer, $self->offset) if ref $desc->{endian_converter} eq 'ARRAY';

    my $i = $self->offset;
    # unpack('f'/'d', ...) unpacks to NaN
    my @v = unpack($desc->{template}, substr($$buffer, $i, $desc->{message_length}));

    if (ref $desc->{packfilter_index} eq 'ARRAY') {
        my $piv = $desc->{packfilter_index};
        my ($i, $j);
        my @v_t = @v;

        @v = ($v_t[0]);

        for ($i = 1, $j = 3 ; $j < @$piv ; $j += 4) {
            my ($type, $i_array_t, $c, $i_array) = @$piv[($j - 3) .. $j];
            my $delta = $packfactor[$type];

            $i < $i_array_t and push @v, @v_t[$i .. ($i_array_t - 1)];
            $i = $i_array_t + $c * $delta;

            for (; $i_array_t < $i ; $i_array_t += $delta) {
                push @v, $unpackfilter[$type]->(@v_t[$i_array_t .. ($i_array_t + $delta - 1)]);
            }
        }
    }

    $self->offset($i + $desc->{message_length});

    my $cb = $desc->{callback};

    my $ret_val;
    if (ref $cb eq 'ARRAY') {
        $v[0] & $rechd_mask_compressed_timestamp_header and push @v, $self->last_timestamp + ($v[0] & $rechd_mask_cth_timestamp);
        $ret_val = $cb->[0]->($self, $desc, \@v, @$cb[1 .. $#$cb]);
    } else {
        $ret_val = 1;
    }
    return $ret_val
}

sub pack_data_message {
    my ($self, $desc, $v) = @_;
    my $drop_devdata = $self->drop_developer_data;

    if ($drop_devdata && ($desc->{message_name} eq 'developer_data_id' || $desc->{message_name} eq 'field_description')) {
        '';
    } else {
        my $rv = $v;

        if (ref $desc->{packfilter_index} eq 'ARRAY') {
            my @v = ($v->[0]);
            my $piv = $desc->{packfilter_index};
            my ($i, $j);

            for ($i = 1, $j = 3 ; $j < @$piv ; $j += 4) {
                my ($type, $i_array_t, $c, $i_array) = @$piv[($j - 3) .. $j];

                $i < $i_array and push @v, @$v[$i .. ($i_array - 1)];
                $i = $i_array + $c;

                for (; $i_array < $i ; ++$i_array) {
                    push @v, $packfilter[$type]->($v->[$i_array]);
                }
            }
            $rv = \@v;
        }

        if ($drop_devdata) {
            if ($desc->{devdata_first} > 0) {
                pack($desc->{template_without_devdata}, @$rv[0 .. ($desc->{devdata_first} - 1)]);
            } else {
                '';
            }
        } else {
            pack($desc->{template}, @$rv);
        }
    }
}

=over 4

=item switched(I, I, I)

returns real data type attributes for a C's union like field.

=back

=cut

sub switched {
    my ($self, $desc, $v, $sw) = @_;
    my ($keyv, $key, $attr);

    if (ref $sw->{_by} eq 'ARRAY') {
        $keyv = $sw->{_by};
    } else {
        $keyv = [$sw->{_by}];
    }

    for $key (@$keyv) {
        my $i_name = 'i_' . $key;
        my $val;

        if (defined $desc->{$i_name} && ($val = $v->[$desc->{$i_name}]) != $desc->{'I_' . $key}) {
            my $key_tn = $desc->{'t_' . $key};

            if (defined $key_tn) {
                my $t_val = $self->named_type_value($key_tn, $val);

                $val = $t_val if defined $t_val;
            }

            if (ref $sw->{$val} eq 'HASH') {
                $attr = $sw->{$val};
                last;
            }
        }
    }
    $attr;
}

sub _string_value {
    my ($v, $i, $n) = @_;           # array of values, offset, count
    my $j;

    for ($j = 0 ; $j < $n ; ++$j) {
        $v->[$i + $j] == 0 && last;
    }
    pack('C*', @{$v}[$i .. ($i + $j - 1)]);
}

sub value_processed {
    my ($self, $num, $attr) = @_;

    if (ref $attr eq 'HASH') {
        my ($unit, $offset, $scale) = @{$attr}{qw(unit offset scale)};

        $num /= $scale  if defined $scale and $scale > 0;
        $num -= $offset if $offset;

        if (defined $unit) {
            my $unit_tab = $self->unit_table($unit);

            if (ref $unit_tab eq 'HASH') {
                my ($unit1, $offset1, $scale1) = @{$unit_tab}{qw(unit offset scale)};

                if ($scale1 > 0) {
                    $num /= $scale1;
                    $scale += $scale1;
                }
                $num -= $offset1 if $offset1;
                $unit = $unit1   if defined $unit1
            }

            if (defined $scale and $scale > 0) {
                my $below_pt = int(log($scale + 9) / log(10));

                if ($self->without_unit) {
                    sprintf("%.${below_pt}f", $num);
                } else {
                    sprintf("%.${below_pt}f %s", $num, $unit);
                }
            } elsif ($self->without_unit) {
                $num;
            } else {
                $num . " " . $unit;
            }
        } elsif (defined $scale and $scale > 0) {
            my $below_pt = int(log($scale + 9) / log(10));
            sprintf("%.${below_pt}f", $num);
        } else {
            $num;
        }
    } else {
        $num;
    }
}

sub value_unprocessed {
    my ($self, $str, $attr) = @_;

    if (ref $attr eq 'HASH') {
        my ($unit, $offset, $scale) = @{$attr}{qw(unit offset scale)};
        my $num = $str;

        if (defined $unit) {
            my $unit_tab = $self->unit_table($unit);

            if (ref $unit_tab eq 'HASH') {
                my ($unit1, $offset1, $scale1) = @{$unit_tab}{qw(unit offset scale)};

                $scale  += $scale1  if defined $scale1 and $scale1 > 0;
                $offset += $offset1 if $offset1;
                $unit    = $unit1   if defined $unit1
            }

            length($num) >= length($unit) && substr($num, -length($unit)) eq $unit
                and substr($num, -length($unit)) = '';
        }

        $num += $offset if $offset;
        $num *= $scale  if defined $scale and $scale > 0;
        $num;
    } else {
        $str;
    }
}

=over 4

=item fields_list( $descriptor [, keep_unknown => $boole )

Given a data message descriptor (I<$descriptor>), returns the list of fields described in it. If C is set to true, unknown field names will also be listed.

=back

=cut

sub fields_list {
    my ($self, $desc) = (shift, shift);
    my %opts = @_;
    croak "argument to fields_list() does not look like a data descriptor hash" if ref $desc ne 'HASH';

    my (@keys, %fields, @fields);

    @keys = grep /^i_/, keys %$desc;
    @keys = grep !/^i_unknown/, @keys unless $opts{keep_unknown};

    # %fields = %$desc{ @keys };
    for my $key (@keys) {                   # hash slices not supported in versions prior to 5.20
        $fields{$key} = $desc->{$key};
    }

    # sort for easy comparison with values aref passed to callbacks
    @fields = sort { $fields{$a} <=> $fields{$b} } keys %fields;
    map s/^i_//, @fields;
    return @fields
}

=over 4

=item fields_defined( $descriptor, $values )

Given a data message descriptor (I<$descriptor>) and a corresponding data array reference of values (I<$values>), returns the list of fields whose value is defined. Unknow field names are never listed.

=back

=cut

sub fields_defined {
    my ($self, $descriptor, $values) = @_;

    my @fields = $self->fields_list( $descriptor );

    my @defined;
    for my $field (@fields) {
        my $index = $descriptor->{ 'i_' . $field };
        push @defined, $field if $values->[ $index ] != $descriptor->{'I_' . $field}
    }
    return @defined
}


=over 4

=item field_value( I<$field>, I<$descriptor>, I<$values> )

Returns the value of the field named I<$field> (a string).

The other arguments consist of the data message descriptor (I<$descriptor>, a hash reference) and the values fetched from a data message (I<$values>, an array reference). These are simply the references passed to data message callbacks by C, if any are registered, and are simply to be passed on to this method (please do not modifiy them).

For example, we can define and register a callback for C data messages and get the name of the manufacturer of the device that recorded the FIT file:

    my $file_id_callback = sub {
        my ($self, $descriptor, $values) = @_;
        my $value = $self->field_value( 'manufacturer', $descriptor, $values );

        print "The manufacturer is: ", $value, "\n"
        };

    $fit->data_message_callback_by_name('file_id', $file_id_callback ) or die $fit->error;

    1 while ( $fit->fetch );

=back

=cut

sub field_value {
    my ($self, $field_name, $descriptor, $values_aref) = @_;

    my @keys = map $_ . $field_name, qw( t_ a_ I_ );
    my ($type_name, $attr, $invalid, $value) =
                ( @{$descriptor}{ @keys }, $values_aref->[ $descriptor->{'i_' . $field_name} ] );

    if (defined $attr->{switch}) {
        my $t_attr = $self->switched($descriptor, $values_aref, $attr->{switch});
        if (ref $t_attr eq 'HASH') {
            $attr      = $t_attr;
            $type_name = $attr->{type_name}
        }
    }

    my $ret_val = $value;
    if ($value != $invalid) {
        if (defined $type_name) {
            $ret_val = $self->named_type_value($type_name, $value);
            return $ret_val if defined $ret_val
        }

        if (ref $attr eq 'HASH') {
            $ret_val = $self->value_processed($value, $attr)
        }
    }
    return $ret_val
}

=over 4

=item field_value_as_read( I<$field>, I<$descriptor>, I<$value> [, $type_name_or_aref ] )

Converts the value parsed and returned by C back to what it was when read from the FIT file and returns it.

This method is mostly for developers or if there is a particular need to inspect the data more closely, it should seldomly be used. Arguments are similar to C except that a single value I<$value> is passed instead of an array reference. That value corresponds to the value the former method has or would have returned.

As an example, we can obtain the actual value recorded in the FIT file for the manufacturer by adding these lines to the callback defined above:

        my $as_read = $self->field_value_as_read( 'manufacturer', $descriptor, $value );
        print "The manufacturer's value as recorded in the FIT file is: ", $as_read, "\n"

The method will raise an exception if I<$value> would have been obtained by C via an internal call to C. In that case, the type name or the original array reference of values that was passed to the callback must be provided as the last argument. Otherwise, there is no way to guess what the value read from the file may have been.

=back

=cut

sub field_value_as_read {
    my ($self, $field_name, $descriptor, $value, $optional_last_arg) = @_;

    my @keys = map $_ . $field_name, qw( t_ a_ I_ );
    my ($type_name, $attr, $invalid) = ( @{$descriptor}{ @keys } );

    if (defined $attr->{switch}) {

        my $croak_msg = 'this field\'s value was derived from a call to switched(), please provide as the ';
        $croak_msg   .= 'last argument the type name or the array reference containing the original values';
        croak $croak_msg unless defined $optional_last_arg;

        if (ref $optional_last_arg eq 'ARRAY') {
            my $t_attr = $self->switched($descriptor, $optional_last_arg, $attr->{switch});
            if (ref $t_attr eq 'HASH') {
                $attr      = $t_attr;
                $type_name = $attr->{type_name}
            }
        } else { $type_name = $optional_last_arg }
    }

    my $ret_val = $value;
    if ($value !~ /^[-+]?\d+$/) {
        if (defined $type_name ) {
            my $ret_val = $self->named_type_value($type_name, $value);
            return $ret_val if defined $ret_val
        }

        if (ref $attr eq 'HASH') {
            $ret_val = $self->value_unprocessed($value, $attr)
        }
    }
    return $ret_val
}

=over 4

=item value_cooked(I, I, I, I)

This method is now deprecated and is no longer supported. Please use C instead.

converts I to a (hopefully) human readable form.

=back

=cut

sub value_cooked {
    my ($self, $tname, $attr, $invalid, $val) = @_;

    if ($val == $invalid) {
        $val;
    } else {
        if (defined $tname) {
            my $vname = $self->named_type_value($tname, $val);

            defined $vname && return $vname;
        }

        if (ref $attr eq 'HASH') {
            $self->value_processed($val, $attr);
        } else {
            $val;
        }
    }
}

=over 4

=item value_uncooked(I, I, I, I)

This method is now deprecated and is no longer supported. Please use C instead.

converts a human readable representation of a datum to an original form.

=back

=cut

sub value_uncooked {
    my ($self, $tname, $attr, $invalid, $val) = @_;

    if ($val !~ /^[-+]?\d+$/) {
        if ($tname ne '') {
            my $vnum = $self->named_type_value($tname, $val);

            defined $vnum && return $vnum;
        }

        if (ref $attr eq 'HASH') {
            $self->value_unprocessed($val, $attr);
        } else {
            $val;
        }
    } else {
        $val;
    }
}

sub seconds_to_hms {
    my ($self, $s) = @_;
    my $sign = 1;

    if ($s < 0) {
        $sign = -1;
        $s = -$s;
    }

    my $h = int($s / 3600);
    my $m = int(($s - $h * 3600) / 60);

    $s -= $h * 3600 + $m * 60;

    my $hms = sprintf('%s%uh%um%g', $sign < 0 ? '-' : '', $h, $m, $s);

    $hms =~ s/\./s/ or $hms .= 's';
    $hms;
}

sub drop_developer_data {
    my $self = shift;
    if (@_) {
        $self->{drop_developer_data} = $_[0];
    } else {
        $self->{drop_developer_data};
    }
}

sub initialize {
    my $self = shift;
    my $buffer = '';

    %$self = (
        'error' => undef,
        'file_read' => 0,
        'file_processed' => 0,
        'offset' => 0,
        'buffer' => \$buffer,
        'fh' => new FileHandle,
        'data_message_callback' => +{},
        'unit_table' => +{},
        'drop_developer_data' => 0,
        );

    $self->data_message_callback_by_name(developer_data_id => \&syscallback_devdata_id);
    $self->data_message_callback_by_name(field_description => \&syscallback_devdata_field_desc);
    $self;
}

# undocumented (used by fitdump.pl is chained files)
sub reset {
    my $self = shift;
    $self->clear_buffer;

    %$self = map {($_ => $self->{$_})} qw(error buffer fh data_message_callback unit_table profile_version
                                          EOF use_gmtime numeric_date_time without_unit maybe_chained);

    my $buffer = $self->buffer;
    $self->file_read(length($$buffer));
    $self->file_processed(0);
    $self;
}

my @type_name = ();

$type_name[FIT_ENUM] = 'ENUM';
$type_name[FIT_SINT8] = 'SINT8';
$type_name[FIT_UINT8] = 'UINT8';
$type_name[FIT_SINT16] = 'SINT16';
$type_name[FIT_UINT16] = 'UINT16';
$type_name[FIT_SINT32] = 'SINT32';
$type_name[FIT_UINT32] = 'UINT32';
$type_name[FIT_STRING] = 'STRING';
$type_name[FIT_FLOAT32] = 'FLOAT32';
$type_name[FIT_FLOAT64] = 'FLOAT64';
$type_name[FIT_UINT8Z] = 'UINT8Z';
$type_name[FIT_UINT16Z] = 'UINT16Z';
$type_name[FIT_UINT32Z] = 'UINT32Z';
$type_name[FIT_BYTE] = 'BYTE';

sub isnan {
    my $ret_val;
    do { no warnings 'numeric'; $ret_val = !defined( $_[0] <=> 9**9**9 ) };
    return $ret_val
}

sub print_all_fields {
    my ($self, $desc, $v, %opt) = @_;
    my ($indent, $fh, $skip_invalid) = @opt{qw(indent fh skip_invalid)};

    $fh = \*STDOUT if !defined $fh;
    $fh->print($indent, 'compressed_timestamp: ', $self->named_type_value('date_time', $v->[$#$v]), "\n") if $desc->{array_length} == $#$v;

    for my $i_name (sort {$desc->{$a} <=> $desc->{$b}} grep {/^i_/} keys %$desc) {
        my $name = $i_name;
        $name =~ s/^i_//;

        my $attr = $desc->{'a_' . $name};
        my $tname = $desc->{'t_' . $name};
        my $pname = $name;

        if (ref $attr->{switch} eq 'HASH') {
            my $t_attr = $self->switched($desc, $v, $attr->{switch});

            if (ref $t_attr eq 'HASH') {
                $attr = $t_attr;
                $tname = $attr->{type_name};
                $pname = $attr->{name};
            }
        }

        my $i = $desc->{$i_name};
        my $c = $desc->{'c_' . $name};
        my $type = $desc->{'T_' . $name};
        my $invalid = $desc->{'I_' . $name};
        my $j;

        for ($j = 0 ; $j < $c ; ++$j) {
            isnan($v->[$i + $j]) && next;
            $v->[$i + $j] != $invalid && last;
        }

        if ($j < $c || !$skip_invalid) {
            if (defined $tname) {
                $self->last_timestamp($v->[$i]) if $type == FIT_UINT32 && $tname eq 'date_time' && $pname eq 'timestamp';
            }
            $fh->print($indent, $pname, ' (', $desc->{'N_' . $name}, '-', $c, '-', $type_name[$type] ne '' ? $type_name[$type] : $type);
            $fh->print(', original name: ', $name) if $name ne $pname;
            $fh->print(', INVALID') if $j >= $c;
            $fh->print('): ');

            if ($type == FIT_STRING) {
                $fh->print("\"", _string_value($v, $i, $c), "\"\n");
            } else {
                $fh->print('{') if $c > 1;

                my $pval = $self->value_cooked($tname, $attr, $invalid, $v->[$i]);

                $fh->print($pval);
                $fh->print(' (', $v->[$i], ')') if $v->[$i] ne $pval;

                if ($c > 1) {
                    my ($j, $k);

                    for ($j = $i + 1, $k = $i + $c ; $j < $k ; ++$j) {
                        $pval = $self->value_cooked($tname, $attr, $invalid, $v->[$j]);
                        $fh->print(', ', $pval);
                        $fh->print(' (', $v->[$j], ')') if $v->[$j] ne $pval;
                    }
                    $fh->print('}');
                }
                $fh->print("\n");
            }
        }
    }
    1;
}

sub print_all_json {
    my ($self, $desc, $v, %opt) = @_;
    my ($indent, $fh, $skip_invalid) = @opt{qw(indent fh skip_invalid)};

    my $out = 0;

    $fh = \*STDOUT if !defined $fh;
    if ($desc->{array_length} == $#$v) {
        $fh->print($indent, '"compressed_timestamp": "', $self->named_type_value('date_time', $v->[$#$v]), '"');
        $out = $out + 1;
    }

    for my $i_name (sort {$desc->{$a} <=> $desc->{$b}} grep {/^i_/} keys %$desc) {
        my $name = $i_name;
        $name =~ s/^i_//;

        my $attr = $desc->{'a_' . $name};
        my $tname = $desc->{'t_' . $name};
        my $pname = $name;

        if (ref $attr->{switch} eq 'HASH') {
            my $t_attr = $self->switched($desc, $v, $attr->{switch});

            if (ref $t_attr eq 'HASH') {
                $attr = $t_attr;
                $tname = $attr->{type_name};
                $pname = $attr->{name};
            }
        }

        my $i = $desc->{$i_name};
        my $c = $desc->{'c_' . $name};
        my $type = $desc->{'T_' . $name};
        my $invalid = $desc->{'I_' . $name};
        my $j;

        for ($j = 0 ; $j < $c ; ++$j) {
            isnan($v->[$i + $j]) && next;
            $v->[$i + $j] != $invalid && last;
        }

        if ($j < $c || !$skip_invalid) {
            $self->last_timestamp($v->[$i]) if $type == FIT_UINT32 && $tname eq 'date_time' && $pname eq 'timestamp';
            $fh->print(",\n") if $out;
            $fh->print($indent, '"', $pname, '": ');

            if ($type == FIT_STRING) {
                $fh->print("\"", _string_value($v, $i, $c), "\"");
            } else {
                $fh->print('[') if $c > 1;

                my $pval = $self->value_cooked($tname, $attr, $invalid, $v->[$i]);

                if (looks_like_number($pval)) {
                    $fh->print($pval);
                } else {
                    $fh->print("\"$pval\"");
                }

                if ($c > 1) {
                    my ($j, $k);

                    for ($j = $i + 1, $k = $i + $c ; $j < $k ; ++$j) {
                        $pval = $self->value_cooked($tname, $attr, $invalid, $v->[$j]);
                        $fh->print(', ');
                        if (looks_like_number($pval)) {
                            $fh->print($pval);
                        } else {
                            $fh->print("\"$pval\"");
                        }
                    }

                    $fh->print(']');
                }
            }
            $out = $out + 1;
        }
    }
    1;
}

=over 4

=item use_gmtime(I)

sets the flag which of GMT or local timezone is used for C type value conversion. Defaults to true.

=back

=cut

my $use_gmtime = 0;

sub use_gmtime {
    my $self = shift;

    if (@_) {
        if (ref $self eq '') {
            $use_gmtime = $_[0];
        } else {
            $self->{use_gmtime} = $_[0];
        }
    } elsif (ref $self eq '') {
        $use_gmtime;
    } else {
        $self->{use_gmtime};
    }
}

=over 4

=item unit_table(I => I)

sets I for I.

=back

=cut

sub unit_table {
    my $self = shift;
    my $unit = shift;

    if (@_) {
        $self->{unit_table}->{$unit} = $_[0];
    } else {
        $self->{unit_table}->{$unit};
    }
}

sub without_unit {
    my $self = shift;
    if (@_) {
        $self->{without_unit} = $_[0];
    } else {
        $self->{without_unit};
    }
}

=over 4

=item semicircles_to_degree(I)

=item mps_to_kph(I)

wrapper methods of C method. C defaults to true.

=back

=cut

sub semicircles_to_degree {
    my ($self, $on) = @_;
    $self->unit_table('semicircles' => $on ? +{'unit' => 'deg', 'scale' => 2 ** 31 / 180} : undef);
}

sub mps_to_kph {
    my ($self, $on) = @_;
    $self->unit_table('m/s' => $on ? +{'unit' => 'km/h', 'scale' => 1 / 3.6} : undef);
}

=over 4

=item close()

closes opened file handles.

=back

=cut

sub close {
    my $self = shift;
    my $fh = $self->fh;
    $fh->close if $fh->opened;
}

=over 4

=item profile_version_string()

Returns a string representation of the profile version used by the device or application that created the FIT file opened in the instance.

C<< fetch_header() >> must have been called at least once for this method to be able to return a value, will raise an exception otherwise.

=back

=head2 Functions

The following functions are provided. None are exported, they may be called as C<< Geo::FIT::message_name(20) >>, C<< Geo::FIT::field_name('device_info', 4) >> C<< Geo::FIT::field_number('device_info', 'product') >>, etc.

=over 4

=item message_name(I)

returns the message name for I or undef.

=item message_number(I)

returns the message number for I or undef.

=back

=cut

sub message_name {
    my $mspec = shift;
    my $msgtype = $mspec =~ /^\d+$/ ? $msgtype_by_num{$mspec} : $msgtype_by_name{$mspec};

    if (ref $msgtype eq 'HASH') {
        $msgtype->{_name};
    } else {
        undef;
    }
}

sub message_number {
    my $mspec = shift;
    my $msgtype = $mspec =~ /^\d+$/ ? $msgtype_by_num{$mspec} : $msgtype_by_name{$mspec};

    if (ref $msgtype eq 'HASH') {
        $msgtype->{_number};
    } else {
        undef;
    }
}

=over 4

=item field_name(I, I)

returns the field name for I in I or undef.

=item field_number(I, I)

returns the field index for I in I or undef.

=back

=cut

sub field_name {
    my ($mspec, $fspec) = @_;
    my $msgtype = $mspec =~ /^\d+$/ ? $msgtype_by_num{$mspec} : $msgtype_by_name{$mspec};

    if (ref $msgtype eq 'HASH') {
        my $flddesc = $msgtype->{$fspec};
        ref $flddesc eq 'HASH'
            and return $flddesc->{name};
    }
    undef;
}

sub field_number {
    my ($mspec, $fspec) = @_;
    my $msgtype = $mspec =~ /^\d+$/ ? $msgtype_by_num{$mspec} : $msgtype_by_name{$mspec};

    if (ref $msgtype eq 'HASH') {
        my $flddesc = $msgtype->{$fspec};
        ref $flddesc eq 'HASH'
            and return $flddesc->{number};
    }
    undef;
}

=head2 Constants

Following constants are exported: C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C.

Also exported are:

=over 4

=item FIT_BYTE

numbers representing base types of field values in data messages.

=item FIT_BASE_TYPE_MAX

the maximal number representing base types of field values in data messages.

=item FIT_HEADER_LENGTH

length of a .FIT file header.

=back

=head2 Data message descriptor

When C method meets a definition message, it creates a hash which includes various information about the corresponding data message. We call the hash a data message descriptor. It includes the following key value pairs.

=over 4

=item I => I

in a global .FIT profile.

=item C => I

necessarily.

=item C => I

necessarily.

=item C => I

only if the message is documented.

=item C => I

of a callback function and callback data, only if a C is registered.

=item C => I

of multi-octets data in this message, where 0 for littel-endian and 1 for big-endian.

=item C