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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
Hi!
0x2A56is based on https://github.com/oesmith/gatt-xml/blob/master/org.bluetooth.characteristic.digital.xml (for some reason the Bluetooth SIG stopped hosting pages on these which makes them harder to find)It's handled by EspruinoHub here: https://github.com/espruino/EspruinoHub/blob/master/lib/attributes.js#L257
Basically you need to advertise a UUID type and so we (ab)use the Bluetooth 'digital input' service type. You could also use analog, or there are a bunch of other ones there.
There's also the ability to use Espruino's own UUID (
0x0590) and then you can even send JSON (although since there are so few bytes available you're quite limited)