How to read bouldering activity.

Hi folks,

I have an app that decode FIT files. For now only bike/running activities.

Now I'd like to decode FIT bouldering activities recorded with my Garmin Fenix 6, but when I use FitCSVTools to analyze these bouldering activities I can't figure out when climbs are.

There are a lot of unknown_* messages that I cannot figure out what they are and extract from them useful information.

The only things I can get are: heart rate, start time, end time and things like that, but all those information are not enough.

Any clue?

Thank you!