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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
I haven't specifically done anything, but if you can configure the Arduino code to expose a Bluetooth characteristic then it should be trivial to handle on Espruino.
Also worth adding that Espruino implements the Web Bluetooth API, so if you can find an example of using the Arduino code with Web Bluetooth then you can pretty much copy/paste the Web Bluetooth code onto Bangle.js and it should work