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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
Do you have an example of how you'd do that with Web Bluetooth?
I didn't think you could do it (at least not without connecting to something) because Web Bluetooth tries very hard not to let malicious websites gain any identifiable information about the underlying hardware (like unique BLE IDs).