How to Interface nRF9160 with external MCU for nb-IOT control using AT commands?

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.

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

Hi Hakon

Thanks a lot for your help.

I am able to find nrf/application and built it successfully, but I am getting warnings more than 50. I don't know they are for.

I have flash the file into DK board and able to test AT commands on over USB with pc.

Now, for MCU purpose, need to changes those line but not able find this lines , 

"CONFIG_UART_0_NRF_HW_ASYNC_TIMER=2 ,

#CONFIG_SLM_CONNECT_UART_2=y, 

#CONFIG_UART_2_NRF_HW_ASYNC_TIMER=2" in file.

Attaching the prj.conf file,

Thanks 

My bad, it's in boards/nrf9160dk_nrf9160_ns.conf. This was changed recently.

Hi Hakon,

Thanks for your help and sorry for late reply. 

I will look into your referral  links and update you soon.

Hi Hakon,

Thanks for your support.

Now, I am able to connect with  board with UART2 on pin P0.10, P0.11. 

Is There any other pins are available for UART2 , expect P0.10, P0.11?  If Yes, can you please share here?

can I use any other UART for same purpose? 

Thanks & Regards,

Ashvin Makwana

Ashvin Makwana said:

If Yes, can you please share here?

You can see most GPIO pins that are not being used by the DK already. For more information you can look here.

Ashvin Makwana said:

If Yes, can you please share here?

You can see most GPIO pins that are not being used by the DK already. For more information you can look here.

Hi

Thanks for your reply. 

I am able change UART2 pins to another pins and tested with at commands.  UART communication is working now.

Now, I am trying to detect the SIM card in custom board with AT commands, but getting error in response. I think SIM_1V8 voltage is not getting generated from nRF91.

I am not using eSIM.

Test case : 

Measuring Voltage on SIM_1V8 (Pin 49) in DK : 

1) When sim card is connected with DK board and sending AT commands AT+CFUN=1, I am getting 1V8 on P30.

2) When sim card is not connected with DK board and sending same commands, I am not getting 1V8 on P30.

3) Only connecting sim card but not getting voltage on P30.

Is there any SIM_DET pin is being used inside DK board? which is being used for sim inserted into  socket or not.

I have checked layout of DK board for sim detect but did not found any pin which is connected to sim socket.

I am following this ref links for sim interface. 

NOTE: SIM_1V8 is not getting generated in custom board.

Custom board AT test. 

AT 

OK
AT+CFUN=1

OK
AT+CFUN?

+CFUN: 1
OK
AT+CPIN?

ERROR

Can you create a separate ticket for these questions? They seem to deviate a bit from the original question.