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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
Did you try my Ctrl+C suggestion?
0x1b/etc are just escape codes to set up VT100 terminals correctly
The Web IDE sends some JavaScript code when it connects, and looks for a response. I imagine the problem might just be that there is absolutely no flow control on serial comms - XOn/XOff or otherwise - and if you send code that takes a lot of time to execute, that will cause subsequent code to get lost (once the buffer is full).