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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
Ok, I just tried and my phone (Moto G3) doesn't appear to be capable of being a GATT Server - at least I can't get anything out of nRF Connect that's visible on any other device.
Unless you're supplying the phones for your Orienteering, you might find that some of them are like mine. It might be that trying to work the other way (with the app on the phone initiating the connection to the Puck) is compatible with far more phones.