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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
Would you be able to post up your code in a separate thread?
Are you uploading your code via Bluetooth, or using the USB Serial adaptor with the RAK8212? The RAK8212 only has one serial port, so if you upload via Serial then when the board changes the Serial port to try and connect to the modem, you'll lose contact.