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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.
@CrashingDutchman
After flashing Espruino firmware to my Sonoff you have to disconnect it from power (USB). Then connect again and make a connection to it with Putty (Serial / 115200 bd).
Re-connect again and now use Espruino.