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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.
@DrAzzy
Yes - but I think you'd need to write code to move the console to UART4. I haven't tried this, except on UART1.
If you use UART1 (A9/A10), it will automatically use that as the console if USB isn't connected (those are the same pins used by the HC-05 bluetooth<->serial module, if you install it, allowing you to connect over bluetooth and control it that way).