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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.
Denzel
@dave_irvine
And are you trying to use screen to connect to the same device that the IDE marks as "Espruino board"? On my system trying to use a /dev/cu.* device fails, but I get two devices listed in the IDE, the other one being a /dev/tty.* device, which works.