SIMCOM 7000E registration failes


  • Hi,

    We have the SIMCOM 7000E evaluation board but somehow cannot always connect to the NB-IOT network. We also have several uBlox modules on the same location and these are always connecting, so the signal should not be the problem i guess.

    The tested output is below:
    ATZ
    OK
    AT+CFUN=0
    +CPIN: NOT READY
    OK
    AT+CNMP=38
    OK
    AT+CMNB=2
    OK
    AT+NBSC=0
    OK
    AT+CBANDCFG=“NB-IOT”,8
    OK
    AT+CFUN=1
    OK
    +CPIN: READY
    SMS Ready
    AT+CREG=1
    OK
    AT+COPS=1,2,“20416”,9
    OK
    +CREG: 3
    +CREG: 2
    AT+COPS?
    +COPS: 0,2,“20416”,0 //Connected to the GSM network
    OK
    AT+CREG?
    +CREG: 1,2
    OK
    AT+CGREG?
    +CGREG: 0,5
    OK
    AT+CGATT?
    +CGATT: 1
    OK
    AT+CPSI?
    +CPSI: GSM,Online,204-16,0x0405,13253,858 DCS 1800,-82,0,29-29
    OK

    As shown in the last line we somehow always connect to the GSM network. Last Monday we were able to the NB-IOT network connect twice, but it is is not clear why, the log of Monday below:
    ATZ
    OK
    AT+CFUN=0
    +CPIN: NOT READY
    OK
    AT+CNMP=38
    OK
    AT+CMNB=2
    OK
    AT+NBSC=0
    OK
    AT+CBANDCFG=“NB-IOT”,8
    OK
    AT+CFUN=1
    OK
    +CPIN: READY
    SMS Ready
    AT+CREG=1
    OK
    AT+COPS=1,2,"20416"
    OK
    +CREG: 0
    +CREG: 3
    AT+COPS=1,2,“20416”,9
    OK
    AT+CGREG?
    +CGREG: 0,5
    OK
    AT+COPS?
    +COPS: 1,2,“20416”,9 //Connected to the NB-IOT network
    OK
    AT+CGATT?
    +CGATT: 1
    AT+CGPADDR
    +CGPADDR: 1,10.128.0.134 //We got an IP address

    Has anybody seen the same behavior before or has a clue on how to check/fix what could be wrong?



  • Ok, found it, module issue. We got a new module and that is working fine.


 

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