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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.
@Jean-Philippe_Rey
Thanks for your useful answers.
I actually never used Serial1 because it seems to be the default console interface when BLE console is not available.
I will try forcing the console on BLE with
E.setConsole("Bluetooth")in order to avoid problems between the console and the device plugged onto the Serial port.