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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
Either way will work. contrib-blue-uart is a less Espruino-specific way that doesn't require a separate service, but EspruinoHub will be able to pick up advertising data and report it back via MQTT.
Info on using EspruinoHub to send commands to Puck.js here: http://www.espruino.com/Puck.js+Node-RED