Cannot connect after network provider reset | Telit Cinterion IoT Developer Community
February 8, 2020 - 12:21am, 2659 views
We are using PLS62-W modems (Revision 02.000 A-Revision 01.000.04)
The modems work OK under normal usage, but we are having problems connecting after sending a network reset command from the network provider's management portal (Twilio). We'd like the modems to be able to go back online in case anyone does such a reset on a production unit.
This is what we see:
AT+CREG=2
OK
AT+CGREG=2
OK
+CREG: 5, "****", "********",2 (URC indicates network OK)
+CGREG: 5,"****","********",2,"xx" (URC indicates data connection OK)
------Send reset command from provider management portal--------
+CGREG: 0 (URC indicates data disconnected)
The modem then stays disconnected. Using AT+CREG? and AT+CGREG? shows:
+CREG: 2,5,"****","********",2
+CGREG: 2,0
We've tried detaching and attaching, but the attach always results in an error:
AT+CGATT=0
OK
AT+CGATT=1
+CME ERROR: unspecified GPRS error
We've tried disconnecting network with +COPS:
AT+COPS=2
OK
+CREG: 0
AT+COPS=0
OK
+CREG: 5,"****","********",2
AT+CGREG?
+CGREG: 2,0
But you can see that the data connection stays offline. Is there a way to force the modem to register its data connection in this case?
Thanks!
When stuck in the state where AT+CGREG? returns +CGREG: 2,0, AT^SMONI returns:
^SMONI: 3G,3065,419,-10.0,-86,***,xx,***x,******x,8,29,NOCONN
Hello,
Please send AT+CEER command after the error. Mabe it can show sone additional information.
You can also try to switch to airplane mode with AT+CFUN=4 and then back to CFUN 1.
If you have access to the network side - is there any possibility to trace the communication between the module and network?
As for SMONI output it only shows connection if there's an active data reansmission ongoing.
Regards,
Bartłomiej
We will try the AT+CEER command to see what other information is available.
We've already tried switching to airplane mode and back, but it did not help. The modem returns to the +CGREG: 2,0 state after reconnecting to the network.
Regarding network tracing, we are just using the providers gateway to send a reset, and don't have access to any tracing tools.
Is it possible the reset is causing the modem to think it is not permitted at that location? In which case a modem reset might be the only way to clear this, or perhaps moving to a different cell would work (haven't tried).
Hello,
I think that to be sure what the module really gets from the network in this particular case and to be able to verify if it's the correct behavior we'd have to get traces from the module. You'd have to report this problem to Gemalto support, if you have access, or to your distributor or sales. Generally only the module reboot provides a complete reset of network interface.
Regards,
Bartłomiej
To answer your earlier question, the response from AT+CEER is:
+CEER: "SM attach error",0,"No cause information available"
Thak you for this information. Unfortunately this CEER reply does not shed more light on the problem.