NB-IoT shield + Arduino M0 Pro. Cannot communicate with AT commands

Hi everyone,

I recently got the combination in the title.

I’ve managed to upload the sketch available at:

However, nothing happens when I type in AT commands in the serial monitor.

I’ve tried using the native USB port as well.
“Both NL & CR” is always enabled. But I’ve made sure none of the other options work either.

I’m really at a loss here.

I’ve tried updating the firmware also, and it doesn’t work. It gets stuck at zero.


You can try these two configurations

On the native port you use:

#define DEBUG_STREAM SerialUSB
#define MODEM_STREAM Serial1

On the programming port you use:

#define DEBUG_STREAM Serial
#define MODEM_STREAM Serial1

Kind regards,