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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
Honestly, this sounds a lot like this:
Bluetooth LE already has provision for advertising standard types of sensor, like for instance Temperature: https://github.com/oesmith/gatt-xml/blob/master/org.bluetooth.characteristic.temperature.xml
The mentioned ATC Thermometer seems to advertise those by default as well.
Ideally Home Assistant should support those actual standards out of the box if it's also supporting bthome (I'm not sure if it does though).
But either way, it'd be trivial to make Espruino/Bangle.js advertise the bthome.io advertising - and I'd be very happy to ensure we host a module that allows that to be done easily