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  • Case ID: 287697
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How to Interface nRF9160 with external MCU for nb-IOT control using AT commands?

user115324

Hi,

I have this development board https://www.nordicsemi.com/Products/Development-hardware/nRF9160-DK .  I would like to use development board as nb-IOT modem and other MCU to control it send data over  nb-IOT modem using AT commands, it is possible to do this? 

I have tested this board with nRF desktop software using 2G network and AT command. 

As of now, I don't  have nb-IOT sim card available to test, so not able to test. 

Query targeting MCU interface : 

1) Which RX, TX pin of nRF9160 would be used to control over MCU? 

2) Which SDK should I use for AT command functionality? 

3) what other changes are needed to work with nb-IOT network ? 

please suggest if there is any reference example available for this purpose.

Any help will be appreciated. 

Thanks & Regards,

Ashvin

  • 0

    Hello,

    please suggest if there is any reference example available for this purpose.

    you can use the SLM sample to achieve this functionality. It should work with NB-IoT as well I believe.

  • 0 in reply to user73166

    Hi, Hakon

    Thanks for your reply. 

    SLM sample which you have suggest, how should I upload or compile for development board, as I am new here.

    Still I am not aware where should I connect UART pins of DK board to External MCU for AT command control.

    Looking forward to hearing from you.

    Thanks

  • 0 in reply to user115324
    Ashvin Makwana said:
    SLM sample which you have suggest, how should I upload or compile for development board, as I am new here.

    If you are new to developing with the nrf9160 you should probably start be reading this. You need to download the SDK and command line tools, before you can start developing.

    Ashvin Makwana said:
    Still I am not aware where should I connect UART pins of DK board to External MCU for AT command control.

    If you are using an external MCU you should uncomment the two lines in prj.conf located in the application folder

    #CONFIG_SLM_CONNECT_UART_2=y
#CONFIG_UART_2_NRF_HW_ASYNC_TIMER=2

    and comment CONFIG_UART_0_NRF_HW_ASYNC_TIMER=2. Then you can check the rx and tx pins in nrf9160dk_nrf9160_ns.overlay located in the application folder. For uart2 this should be P0.11 and P0.10 respectively. You can change the pins if you want, you just need to set different values in the nrf9160dk_nrf9160_ns.overlay file.

  • 0 in reply to user73166

    Hi Hakon

    Thanks again for your support. 

    I have read the above documents and updated pre-built firmware nb-IOT in DK board. 

    I have tested the AT commands over USB connection which are available on DK. 

    Now, as per your suggestion I have followed  your links and tested some example (led blink, Hello world)on board from sample.

    I have checked that SLM application which you have shared and it would help me, but I  am not  able to find that SLM example available in SDK.

    how can I import SLM example that you share into visual studio code? could you please help me on this? 

    Thanks   

  • 0 in reply to user115324

    It's located in nrf/applications sub directory, not nrf/samples.

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