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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
Hi,
That's a strange one... The
CALLBACKtext appears when there was an error when executing some form of callback function.Do you get the message when connecting via the Web IDE? (https://www.espruino.com/ide/) If so, when you connect the actual error (stack trace) should hopefully be printed to the IDE's console, which would really help in tracking it down.