The Arduino library I was working on for the SX1280 has had a couple of flights running a high altitude balloon tracker, and the tracker transmitter and receiver both worked. The library is available for download here;

https://github.com/LoRaTracker/SX1280

Its only been used by myself so far, so test any applications you use it for carefully. The ranging function needs some further investigation, I have seen some instances of invalid results returned.

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