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  • Ok, I'm pretty sure I've figured this out now. It's definitely a firmware issue that's been around for a while I think.

    In fact if you:

    • Paste in var dt = new Date();setTimeout(function(){console.logĀ­(new Date() - dt);},100);
    • Wait X seconds then press Enter
    • Timeout happens X seconds after this

    It's to do with the device sleeping - you probably don't notice it in STM32 boards because they don't sleep when you're connected via USB

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