The monitoring info message gives the context needed to read the monitoring messages of a file: local time, resting metabolic rate and the factors converting cycles into distance and calories for each activity type.
Moment the message refers to, in UTC. FIT stores it as seconds since the FIT epoch (December 31, 1989, 00:00:00 UTC); decoders usually expose it as a regular date.
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.
activityTypeEnum[]Activity types the conversion factors apply to.
allrunningtransitiongenericcyclingfitnessEquipmentswimmingwalkingsedentarywheelchairPushingFactor converting cycles (steps, strokes…) into distance, for each activity type.
Factor converting cycles into calories, for each activity type.
Calories burned per day at rest (resting metabolic rate).
mesgNumStringGlobal message number identifying the kind of message. Decoders use it to know which profile to apply to the data.