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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
I've just tried node-red-contrib-ble-uart and node-red-contrib-ble, and I can't make either of them work properly (although node-red-contrib-ble actually looks more promising).
Not sure what to suggest really - you could contact the authors of those modules/post on their GitHub pages? Puck.js is a standard Nordic UART device, so they should definitely be able to work.