The issue is that you have enabled unsolicited response codes. Several possable solutions 1) add +CREG=0 to your init string to disable. 2) perhaps nm should be able to parse the response string and match it to a regex expression rather than a fixed string. What is important is the the modem is registered to a network so a response of 1 or 5 would be valid
Full command definition 3GPP 27007 defines +CREG Command Possible response(s) +CREG=[<n>] +CREG? +CREG: <n>,<stat>[,<lac>,<ci>[,<AcT>]] *+CME ERROR: <err>* +CREG=? +CREG: (list of supported <n>s) * * *Description* Set command controls the presentation of an unsolicited result code +CREG: <stat> when <n>=1 and there is a change in the MT network registration status, or code +CREG: <stat>[,<lac>,<ci>[,<AcT>]] when <n>=2 and there is a change of the network cell. Read command returns the status of result code presentation and an integer <stat> which shows whether the network has currently indicated the registration of the MT. Location information elements <lac>, <ci> and <AcT>are returned only when <n>=2 and MT is registered in the network. Refer subclause 9.2 for possible <err> values. *Defined values* <n>: *0* disable network registration unsolicited result code 1 enable network registration unsolicited result code +CREG: <stat> 2 enable network registration and location information unsolicited result code +CREG: <stat>[,<lac>,<ci>[,<AcT>]] <stat>: registration status 0 not registered, MT is not currently searching a new operator to register to 1 registered, home network 2 not registered, but MT is currently searching a new operator to register to 3 registration denied 4 unknown 5 registered, roaming <lac>: string type; two byte location area code in hexadecimal format (e.g. "00C3" equals 195 in decimal) <ci>: string type; four byte UTRAN/GERAN cell ID in hexadecimal format <AcT>: access technology of the registered network 0 GSM 1 GSM Compact 2 UTRAN 3 GSM w/EGPRS (see NOTE 1) 4 UTRAN w/HSDPA (see NOTE 2) 5 UTRAN w/HSUPA (see NOTE 2) 6 UTRAN w/HSDPA and HSUPA (see NOTE 2) -- Stuart Ward M +44 7782325143
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