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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.
@MaBe
you should use the /dev/cu.#### port name.
Open the Espruino WEB IDE and click on connect/disconnect icon (upper left corner)
this show a window with existing ports - write down the /dev/cu.####
for your USB-Serial-Controller and use this as MySerialPort