Version 21.115.00 of the FIT SDK is available for download at https://developer.garmin.com/fit/download/ 
In this release:
  • C# SDK
    • Added new FitListener and FitMessages classes. These classes provide generic message listeners and data models to decode any type of FIT file with a few lines of code. See the ActivityDecode recipe in the Cookbook class for usage.
Profile additions in this release:
  • Added new manufacturer ids
    • blackbird
    • meilan_byte
    • ezon
    • spinning_mda
    • hilldating
  • Added new Garmin Product ids
    • descent_t1
    • gnss
    • edge_540
    • edge_840
    • approach_s70
    • fr265_large
    • fr265_small
    • epix_gen2_pro_42
    • epix_gen2_pro_47
    • epix_gen2_pro_51
    • fr965
    • fenix7_pro_solar
    • instinct_2x
    • descent_t2
  • Added new sub-sports for flying sport type
    • fly_canopy
    • fly_paraglide
    • fly_paramotor
    • fly_pressurized
    • fly_navigate
    • fly_timer
    • fly_altimeter
    • fly_wx
    • fly_vfr
    • fly_ifr
  • Added new messages
    • monitoring_hr_data
    • max_met_data
    • spo2_data
    • sleep_level
    • beat_intervals
    • respiration_rate
    • sleep_assessment
    • hrv_status_summary
    • hrv_value
  • Updated weight_scale with
    • bmi
  • Updated session message with
    • sport profile name
    • end_position_lat
    • end_position_long

Release notes for this release and earlier releases can be found at https://forums.garmin.com/developer/fit-sdk/w/fit-sdk-wiki/92/fit-sdk-release-notes 

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