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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.
@Gordon
If you just want to see if you can communicate, there are other apps though -
nRF connectwill connect and you can send simple commands, as will the Adafruit app, and I believeDroidScriptwill work too.