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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 - as long as you've got your Puck.js firmware up to date you should be fine.
As @allObjects says it'd be worth trying some other HID devices out to check - but what might be happening is just that for it to work you have to disconnect and then pair the Puck with your OS's bluetooth menu first - otherwise the OS won't pick up that it's now talking to a mouse.