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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
You're running Espruino on the ESP8266? What I'm saying above is for the Espruino WiFi, where it's connected to the ESP8266 via serial - flow control won't be a problem when running directly on ESP8266.