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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
If the ESC continuously sends the data, you can take a look at the GPS or the PMS7003 code.
"Just" open the serial port, collect the bytes, and process it when you have a full paket.
Of course looks like you have variable packet length, so it's not trivial...