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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
Have you disconnected from the IDE? Puck.js won't advertise while it is still connected to another computer.
Also, an iPhone is unlikely to show anything with the a UUID of all 0s as it's not valid - although you should still be able to see the advertisement and decode it with an app like
NRF Connect.