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  • Case ID: 277537
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AT_CLIENT connects but SERIAL_LTE_MODEM does not connect to network

GerryB

Is there a reason that AT_CLIENT example always works for LTE but SERIAL_LTE_MODEM only works the first time, and then trying again it never connects to the LTE ?  Typing AT+CFUN=1 on both to get things started.  IDE is 1.7.0 with no modifications to the code.

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    Hello Gerry,

    GerryB said:
    yes that is correct.  Same everything

    The thing is: reject cause 17 is a network failure, which I have a hard time to see that it is caused by the device.

    2021-10-04T20:28:37.391Z DEBUG modem << +CEREG: 2,"2D83","01D1860A",7,0,17,"11100000","11100000"
2021-10-04T20:28:39.057Z DEBUG modem << +CEREG: 2,"2D83","01D11B0A",7,0,17,"11100000","11100000"

    Cause #17 – Network failure

    This EMM cause is sent to the UE if the MME cannot service an UE generated request because of PLMN failures.

    And generally, network related operations are handled by the modem firmware and that should be independent of the application running it, so this should not have anything to do with the Serial LTE modem application.

    On the other hand, it is interesting that you constantly are able to reproduce this behaviour. Could you upgrade to mfw 1.3.0 and check if that makes any difference? And do you have the possibility to try a different SIM card as well, maybe?

    Thanks and regards,

    Markus

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    Hello Gerry,

    GerryB said:
    yes that is correct.  Same everything

    The thing is: reject cause 17 is a network failure, which I have a hard time to see that it is caused by the device.

    2021-10-04T20:28:37.391Z DEBUG modem << +CEREG: 2,"2D83","01D1860A",7,0,17,"11100000","11100000"
2021-10-04T20:28:39.057Z DEBUG modem << +CEREG: 2,"2D83","01D11B0A",7,0,17,"11100000","11100000"

    Cause #17 – Network failure

    This EMM cause is sent to the UE if the MME cannot service an UE generated request because of PLMN failures.

    And generally, network related operations are handled by the modem firmware and that should be independent of the application running it, so this should not have anything to do with the Serial LTE modem application.

    On the other hand, it is interesting that you constantly are able to reproduce this behaviour. Could you upgrade to mfw 1.3.0 and check if that makes any difference? And do you have the possibility to try a different SIM card as well, maybe?

    Thanks and regards,

    Markus

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