• Hi - those errors actually come from the puck.js library on the PC.

    I think the easiest way to check for connection is to use Puck.isConnected(). I believe Puck.getConnection().on('close', function() { console.log("connection closed!") }); will work too - but to need to do that after you connected the first time

    The Puck library isn't that well documented externally, but there are a bunch of comments inside it that might help: https://github.com/espruino/EspruinoWebT­ools/blob/master/puck.js#L446

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