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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
No, that's the idea! EspruinoHub is providing the connection for you - any communications stay inside your house. It's just that the IDE iframe is used so you always get an up to date IDE (it'll still work offline though because it's a PWA!).
Recently I did find an issue with it and reconnections (if the device itself drops the connection to EspruinoHub) but I plan to push changes to fix that this week.