Hi,
Here are some extensions I added to the very old FrSky D series telemetry.
If you still have such items with you, you may find it interesting to tweak the software and fit your requirements.
ardupilot/libraries/AP_Frsky_Telem/AP_Frsky_D.cpp at paku-4.6-FrSky · Paku-/ardupilot
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