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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.
@AkosLukacs
Long shot (sorry, got to put the kids to sleep, so this is just my first guess): I think it's binary, that's why you see garbage characters.
Check out PMS7003's code for the buffer handling / decyphering. It might work similarly...