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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
Just to add: Can Android be set up to associate a long-press of a key with calling someone in particular like you used to be able to do with older phones? Puck.js acting as a HID device could easily long-press a number key.