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Freeze module after the command AT ^ SISO = 5 | Thales IoT Developer Community

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ZZLNA0A's picture
ZZLNA0A

December 22, 2021 - 10:08am, 803 views

Hi All.

When I send the command AT ^ SISO = 5 I am able to correctly read the HTTP connection data. But sometimes the command gets stuck, and the modem goes into a freeze state. In particular for the GPRS connection I see that the SM layer remains in the "inactive pending" state. Sometimes, the CME returns: "NETWORK IS DOWN". What can I do to fix the problem? When the modem freezes I have to send the command AT + CFUN = 1,1 even if it is not very nice since it restarts the device.

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Bartłomiej Gemalto Moderator's picture
Bartłomiej Gema...
Dec 22 2021 - 11:25am

Hello,

Could you share some more information i.e. what module type and FW version is it (ATI1 reply) and some log showing what happens? As I understand there is no answer for AT^SISO command? How long did you try to wait? SISO should normally give response quite fast but under the hood there is a connection establishment and it could potentially take longer in some cases, even up to 120 seconds. What happens if you try to send another command on the same interface? Are you able to send AT+CFUN command on the same interface? Please check the network status when the problem happens. Please also observe the network connection parameters with AT^SMONI command and enable some additional URC's like at least CREG, CEREG and CGREG.Have you tried to just close the connection with AT^SISC and try to open again? What happens then?

Best regards,
Bartłomiej

ZZLNA0A's picture
ZZLNA0A
Dec 22 2021 - 12:20pm
Hi, thanks for the answer. I don't have the device with me right now, but I can let you know the firmware version tomorrow. In the meantime, I answer the other questions. When I send the command AT ^ SISO = 5, the response time is variable. I have always checked that I have no network problems, in fact the modem is correctly connected to the network. When I close the service with the AT ^ SISC command and then reopen with AT + SISO = 5, it sometimes crashes ... and I can't send any other commands anymore. 
When it freezes, I notice that the modem remains in an "inactive pending" or active pending state. These states I read them from the GPRS SM layer Do you have any other ideas?