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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
You can try it yourself from the IDE and see if it works ok... http://www.espruino.com/Gadgetbridge#messages-sent-to-bangle-js-from-phone
It seems to work for me - and you can also check that it sends
{"t":"call","n":"ACCEPT"}when you click the 'accept' button