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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
By reference codes, you mean https://wolfgangklenk.wordpress.com/2018/10/12/espruino-on-rak8212-accessing-the-nb-iot-nb1-modem/ ?
What happens if you manually add each command on the left-hand side of the IDE one at a time? You can also add
at.debug()to get debug text printed to help you.The problem may be that you're executing the commands right after each other with no delay between them. In that case, it may be that the modem is just not having time to get a connection.