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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@rj
Until now, I haven't had issues communicating with it using the SX library, and all sources I have seen claims that RA-02 is based on the SX1278 chip (it's hard to confirm anything with these Chinese modules though).
I haven't tried anything else than sending/receiving at different frequencies, so I can't confirm if FSK/OOK, or stuff like spread factor etc. can be configured though.