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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 mean the headunit connects to your phone, and then that drops the Bangle.js connection? Is this Android Auto?
Could it be that Android is set up to 'powersave' Gadgetbridge? That's often the default and you have to disable it in Android settings. In that case Android would shut Gadgetbridge down when it guesses (badly) that it may not be needed, and about the only way to get it to connect again is to run it again manually.
The connection happens from the phone to the watch, so the watch isn't really involved in the decision about when the phone connects to it