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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.
@Ollie
Good way to try out is using one of the free online brokers and a browser client- I use iot.eclipse.org for the broker and the chrome app MQTTBox. You can bring Espruino into it and establish two way communication in a just a few minutes without going into the guts of the protocol itself