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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'm not quite sure I understand - by IP you mean the MAC address? But it sounds pretty secure to me.
Also - nothing stops you from just issuing them a new firmware for their device that they can update with nRF connect/similar?