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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
Did you validate while running on the same computer?
I know on Raspberry Pi for the past few years mosquitto has been set up so that it'll only accept local connections to itself by default, and you have to manually configure it to allow connections from outside