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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.
@Sacha
Arg. If it's not possible to detect without crashing, maybe you could do some peek and poke in WebIDE. Wenn the board is not responding. Ask for a reset and you know that it has failed.
Sacha