Activity message

The activity message wraps up a whole activity file. It is usually written once, at the end, and tells how many sessions the activity contains (several for a triathlon or any multisport activity) and the total timer time. Its localTimestamp is the easiest way to know the time zone the activity was recorded in.

FIT name: activity
Global message number: 34
JavaScript SDK key: activityMesgs
Fields: 9

Fields

timestampDateTime
Moment the activity ended, in UTC.
totalTimerTimeFloat64s
Duration during which the timer was running over the whole activity, pauses excluded.
numSessionsUint16
Number of session messages in the activity: 1 for a single sport activity, more for multisport ones.
typeEnum
Whether the activity is a manual one or an automatic multisport one.
2 possible values
- manual
- autoMultiSport
eventEnum
Kind of event: timer, lap, session, activity, workout step, course point, battery, gear change, rider position change…
46 possible values
- length
- session
- activity
- workout
- lap
- workoutStep
- coursePoint
- battery
- fitnessEquipment
- timer
- powerDown
- powerUp
- offCourse
- virtualPartnerPace
- hrHighAlert
- hrLowAlert
- speedHighAlert
- speedLowAlert
- cadHighAlert
- cadLowAlert
- powerHighAlert
- powerLowAlert
- recoveryHr
- batteryLow
- timeDurationAlert
- distanceDurationAlert
- calorieDurationAlert
- userMarker
- sportPoint
- calibration
- frontGearChange
- rearGearChange
- riderPositionChange
- elevHighAlert
- elevLowAlert
- commTimeout
- autoActivityDetect
- diveAlert
- diveGasSwitched
- tankPressureReserve
- tankPressureCritical
- tankLost
- radarThreatAlert
- tankBatteryLow
- tankPodConnected
- tankPodDisconnected
eventTypeEnum
What happened for the event: start, stop, stopAll, marker, begin or end of a depreciated range…
10 possible values
- stop
- start
- marker
- consecutiveDepreciated
- stopAll
- beginDepreciated
- endDepreciated
- endAllDepreciated
- stopDisable
- stopDisableAll
localTimestampLocalDateTime
Same instant as the timestamp, but expressed in local time. The difference between both gives the UTC offset (time zone and daylight saving time) at the time of recording.
eventGroupUint8
Groups related events together, so that start and stop events of the same group can be paired.
mesgNumString
Global message number identifying the kind of message. Decoders use it to know which profile to apply to the data.

Other activity messages

See all the FIT messages