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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
Ahh - one issue I see is you're not sending a newline character. So it's sending the command but it's like you're not pressing 'enter' to execute it.
Try:
Puck.write('E.showMessage("HI","MESSAGE")\n');