SIMCOM SIM800L - Unable to establish connection

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  • Updated 2 years ago
We are doing initial TCP testing with a SIMCOM SIM800L. Per the SIMCOM documentation, the command sequence to establish a connection is as follows:
AT+CSQ
verify signal level (we see >=18)

AT+CREG?
we see 0,5, registered/roaming

AT+CGATT?
responds 1 - attached

AT+CSTT="neo.iot.net" 
specifies access point name, no uid/passwd, responds OK

AT+CIICR
bring up connection. SIMCOM documentation says this can take up to 85 seconds. We see no response at all (either OK or ERROR) after many minutes

What should we check next?

Thanks,

-lr
 
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Lawrence Rachman

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Posted 2 years ago

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Norma Pavao, Official Rep

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Hi Lawrence,

Can you provide the ICCID you are attempting to get connected?  We would like to verify our logs and device provisioning on our side.

Regards,
Norma
Neo Team
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Lawrence Rachman

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+ICCID: 89185000160629154910
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Lawrence Rachman

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Do you require any additional information?
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Norma Pavao, Official Rep

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Thank you Lawrence for providing the ICCID.  I am presently reviewing the logs to determine next step.  I will provide you an update once I have concluded my review.

Regards,
Norma
Neo Team
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Norma Pavao, Official Rep

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Lawrence, 

In reviewing our logs I observe the device registering on the cellular network updating the location and GPRS although the device is not initiating the start session.  Can you force your device to initiate a data session?

Regards,
Norma
Neo Team
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Lawrence Rachman

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I'm selecting commands based on the manufacturer's documentation, and don't see anything there that is obviously the command to force a a data session to start. Is there a common AT command for this that I might try?

If I issue the AT+CIPSTART... command without first issuing the AT+CIICR, I get an error response.

Manufacturer's documentation available here: http://simcomm2m.com/En/module/detail.aspx?id=138
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Norma Pavao, Official Rep

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Hi Lawrence,

Thank you for the added details, I will consult with our engineers an get back to you on their assessment.

Regards,
Norma
Neo Team
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Norma Pavao, Official Rep

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Hi Lawrence,

I am working with one of our engineers, he has asked if you can run this AT command and provide the output:

AT+CGDCONT?

Regards,
Norma
Neo Team

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Lawrence Rachman

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AT+CGDCONT?
+CGDCONT: 1,"IP","","0.0.0.0",0,0
+CGDCONT: 2,"IP","","0.0.0.0",0,0
+CGDCONT: 3,"IP","","0.0.0.0",0,0

OK
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Norma Pavao, Official Rep

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Thank you Lawrence for providing the information.  I have forwarded them to our engineer for review and input.  I will update you once I hear back.

Regards,
Norma
Neo Team
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Norma Pavao, Official Rep

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Hi Lawrence,

Per our engineer APN is not configure in the device. Please use following command to configure

 AT+CGDCONT=1,”IP”,”neo.iot.net”

Let me know if this resolves the issue.


Regards,

Norma

Neo Team

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Lawrence Rachman

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It did not. But we have been advised by SIMCOM that the radio we are using may be the wrong one for this geographical area. I will investigate his before asking for any more assistance
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Norma Pavao, Official Rep

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Thank you for the update Lawrence.

Regards,
Norma 
Neo Team
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Norma Pavao, Official Rep

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Hi Lawrence,

Just a quick check in with you, can you please advise if you require any further assistance from me regarding this issue.

Regards,
Norma
Neo Team