Interact with nRF9151 using external third party MCU

Hello, guys Wave

We want to evaluate nRF9151 SiP the following way:

  • To set it to operate in serial mode in which it is ready to receive AT commands (it comes pre-flashed in that mode on nRF9151-DK, to the best of my understanding)
  • To send AT commands and other necessary GPIO control using some external MCU (not nRF5340 MCU which is populated on nRF9151-DK board but some third party, external MCU)

Few questions related to our goal:

  1. Is it possible to achieve what we want?
  2. Which UART interface should we use for sending AT commands - UART1 or UART2?
  3. In addition to UART Rx/Tx, do we need some other GPIO to control the modem (e.g. Reset, some other GPIO that plays a role in modem control...)?
  4. We would like to test NB-IoT modem by default and switch to LTE-M if needed. How to achieve this, is there any special AT command for switching between available modes (NB-IoT/LTE-M)?

Thanks in advance for your time and efforts. Looking forward to hearing from you.

Sincerely,
Bojan.

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