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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, it should be possible to do.
It seems there is a Bluetooth Navigation Service (0x1819). Right now I don't see much information about it, but if someone is able to find out what data needs to be set in the Bluetooth services, creating an app to implement that should be pretty easy.