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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
Can you try sending the command
echo(0)and then sendingUSB.println("Hello")or similar? As I'd said above the REPL adds a bunch of other junk and that could be throwing you off.Honestly at this point it sounds like you know more than me about it - I'm not sure there's much I can add really. I'd doubt there is much difference between USB and standard COM ports though.