• Are you trying the GPS out while connected to Bluetooth?

    <- Serial1 means that Bluetooth disconnected and the JS console moved over to Serial1, which is the default - then it moved back to Bluetooth when you reconnected. Using Bluetooth.setConsole(1) would fix that - but it shouldn't be your issue.

    If you disconnect the GPS, then short RX and TX together, I bet you'll find that Serial1.println("Hello") will cause data to be printed to the console.

    I'd try the LED thing - but if that's flashing about the only other thing could be that the GPS is using a different baud rate (even if 9600 is the default for most GPS systems)

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