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LTE cannot be deactivated when +CSCON unsolicited report is enabled

We tested this issue on serial_lte_modem sample on NCS 1.2 and modem mfw_nrf9160_1.2.0

1, Enable CSCON unsolicited report: 

AT+CSCON=2

2, Activate LTE search and connect to cat-M1 network, device will report "+CEREG: 1,"0001","01A2D001"...."

3, Try to deactivate LTE by command "AT+CFUN=20", it will failed, and the device will hang in here and not accept any AT command more.

Is there any problem for our operations?

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  • Hi,

     

    Could you post the log you're seeing? I tried this with slm, and I am unable to get the AT+CFUN=20 to fail, unless I already have taken down the link, in which it returns "<err> at_host: Could not send AT command to modem: -8"

     

    Kind regards,

    Håkon

  • Hi

    I can reporduce this issue by following commands:

    [14:00:17.411]Ready
    [14:00:26.897]AT%XSYSTEMMODE?
    [14:00:26.906]%XSYSTEMMODE: 1,0,1,0
    OK
    [14:00:32.648]AT+CGMR
    [14:00:32.658]mfw_nrf9160_1.2.0
    OK
    [14:00:40.393]AT%XBANDLOCK=2,"1000000000010010001"
    [14:00:40.405]OK
    [14:00:45.873]AT+CSCON=2
    [14:00:45.882]OK
    [14:01:32.657]at+cereg=5
    [14:01:32.667]OK
    [14:01:36.706]AT+CFUN=21
    [14:01:36.745]OK
    [14:01:37.957]+CEREG: 2,"0001","01A2D101",7,0,0,"11100000","11100000"
    [14:01:38.128]+CSCON: 1,7
    [14:01:38.229]+CEREG: 1,"0001","01A2D101",7,,,"11100000","11100000"
    [14:01:40.499]+CSCON: 0,7
    [14:01:52.913]AT+CFUN=20
    [14:01:59.377]AT+CFUN?
    [14:02:06.041]AT+CEREG?

    And, the log will show nothing during the whole test:

    *** Booting Zephyr OS build v2.1.99-ncs1-1141-g616c7d5becd4  ***
    
    [00:00:00.307,373] <inf> app: Serial LTE Modem

Reply
  • Hi

    I can reporduce this issue by following commands:

    [14:00:17.411]Ready
    [14:00:26.897]AT%XSYSTEMMODE?
    [14:00:26.906]%XSYSTEMMODE: 1,0,1,0
    OK
    [14:00:32.648]AT+CGMR
    [14:00:32.658]mfw_nrf9160_1.2.0
    OK
    [14:00:40.393]AT%XBANDLOCK=2,"1000000000010010001"
    [14:00:40.405]OK
    [14:00:45.873]AT+CSCON=2
    [14:00:45.882]OK
    [14:01:32.657]at+cereg=5
    [14:01:32.667]OK
    [14:01:36.706]AT+CFUN=21
    [14:01:36.745]OK
    [14:01:37.957]+CEREG: 2,"0001","01A2D101",7,0,0,"11100000","11100000"
    [14:01:38.128]+CSCON: 1,7
    [14:01:38.229]+CEREG: 1,"0001","01A2D101",7,,,"11100000","11100000"
    [14:01:40.499]+CSCON: 0,7
    [14:01:52.913]AT+CFUN=20
    [14:01:59.377]AT+CFUN?
    [14:02:06.041]AT+CEREG?

    And, the log will show nothing during the whole test:

    *** Booting Zephyr OS build v2.1.99-ncs1-1141-g616c7d5becd4  ***
    
    [00:00:00.307,373] <inf> app: Serial LTE Modem

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