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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
XXX.on('yyy', ...)will add an event listener to the list of event listeners, rather than replacing the existing one like I think you intend...If you want to remove an event listener, just use
USB.removeAllListeners('data')