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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
What kind of device are you trying to connect to?
ttyAMA0 is the Raspberry Pi's built-in UART - it'll be sending characters to a pin on the Pi's pin header.
It's a good sign that is working - if you plugged in a USB device it should appear as
/dev/ttyACM0and assuming the baud rate is correct it'd work fine