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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
Yes - in fact there's a way of reporting battery state along with the 'I'm here' message the Puck would send out anyway.
Generally phones won't just send an alert because of a BLE device (because it could be abused) but you could switch to advertising via Eddystone, or your app could detect the low battery state and issue an alert.