Mobile data connection troubleshooting: Difference between revisions

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  ...
  ...
----
----
* You probably won't see anything when you type commands, and that’s because the screen echo may be disabled. '''ATE1''' command will enable it so that you can see what you write. '''AT+QCSQ=0''' and '''AT+CREG=0''' command stops showing unnecessary output:
* You probably won't see anything when you type commands, and that’s because the screen echo may be disabled. '''ATE1''' command will enable it so that you can see what you write.  
  ...
  ...
  ATE1
  ATE1
  OK
  OK
...
----
* Use commands '''AT+QCSQ=0''' and '''AT+CREG=0''' to stop showing unnecessary output:
...
  at+qcsq=0
  at+qcsq=0
  OK
  OK
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  ...
  ...
----
----
==Debugging process==
==Debugging process==
* If PIN is required, initialize modem with your PIN code:
* If PIN is required, initialize modem with your PIN code:
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  +CPIN: READY
  +CPIN: READY
  ...
  ...
'''Note:''' reboot the module if it fails to identify SIM
'''Note:''' reboot the module if it fails to identify SIM
----
----
* Use command '''AT+CREG''' to check GSM connection:
*Use command '''AT+CREG''' to check GSM connection:
  ...
  ...
  AT+CREG?
  AT+CREG?
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  OK
  OK
  ...
  ...
'''Note:''' OK means that the module has registered on CS domain service
'''Note:''' OK means that the module has registered on CS domain service
----
----
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  OK
  OK
  ...
  ...
'''Note:''' OK means that the module has registered in UMTS/LTE network  
'''Note:''' OK means that the module has registered in UMTS/LTE network  
----
----
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  AT+QICSGP=<contextID>[,<context_type>,<APN>[,<username>,<password>)[,<authentication>]]]
  AT+QICSGP=<contextID>[,<context_type>,<APN>[,<username>,<password>)[,<authentication>]]]


<context type> The protocol type (1 – IPV4; 2 – IPv6).
''<context type>'' The protocol type (1 – IPV4; 2 – IPv6);
<context id> The range is 1-16.
<authentication> The authentication methods (0 – NONE; 1 – PAP; 2 – CHAP; 3-PAP or CHAP)


Example: use '''AT+QICSGP=1,1,"APN_Name","","",1'''
''<context id>'' The range is 1-16;
 
''<authentication>'' The authentication methods (0 – NONE; 1 – PAP; 2 – CHAP; 3-PAP or CHAP).
 
Example: '''AT+QICSGP=1,1,"APN_Name","","",1'''
  ...
  ...
  AT+QICSGP=1,1"bangapro","","",1
  AT+QICSGP=1,1"bangapro","","",1
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  OK
  OK
  ...
  ...
'''Note:''' try and activate a PDP context a few times. If failed, then reboot the module.
'''Note:''' try and activate a PDP context a few times. If failed, then reboot the module.
----
----
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  OK
  OK
  ...
  ...
'''Note:''' if failed – deactivate PDP context - use command '''AT+QIDEACT=<context ID>''' to deactivate PDP context.
'''Note:''' if failed – deactivate PDP context - use command '''AT+QIDEACT=<context ID>''' to deactivate PDP context.
----
----
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  ...
  ...


1 –The context ID. The range is 1-16;
''1'' –The context ID. The range is 1-16;
8.8.8.8 - The host address in string type. The format is a dotted decimal IP address.
 
Response:
''8.8.8.8'' - The host address in string type.
 
'''Note:''' if ping a remote server successfully, response is '''OK''' (means that the module works properly). If there is any error, response is '''ERROR''' (means the problem is in the module).
'''Note:''' if ping a remote server successfully, response is '''OK''' (means that the module works properly). If there is any error, response is '''ERROR''' (means the problem is in the module).


===Example for the provided configuration===
==Example for the provided configuration==
 
  ...
  ...
  root@Teltonika:~# ifdown ppp
  root@Teltonika:~# ifdown ppp

Latest revision as of 14:59, 22 May 2020

Summary

This is a quick guide to help in the debugging process of a router if encounters issues with mobile data connection.

Preparation

  • First, to establish a data connection only through mobile module on RUT, you need connect to router via CLI/SSH (use SSH software such as PuTTY client):
CLI/SSH username: root
CLI/SSH password: <your router’s password>

  • Connect to mobile module of the router:
... 
root@Teltonika:~# ifdown ppp
root@Teltonika:~# /etc/init.d/gsmd stop
root@Teltonika:~# microcom /dev/modem_cmd
+QCSQ: "LTE",47,-75,166,-10
+QCSQ: "LTE",47,-75,161,-10
+CREG: 1,"008B","012CD17",7
...

  • You probably won't see anything when you type commands, and that’s because the screen echo may be disabled. ATE1 command will enable it so that you can see what you write.
...
ATE1
OK
...

  • Use commands AT+QCSQ=0 and AT+CREG=0 to stop showing unnecessary output:
... 
at+qcsq=0
OK
at+creg=0
OK
...

  • Check communication (wait for the module to respond OK):
... 
AT
OK
...

Debugging process

  • If PIN is required, initialize modem with your PIN code:
...
AT+CPIN="xxxx"
...

  • Use command AT+CPIN to query SIM card status:
...
AT+CPIN?
+CPIN: READY
...

Note: reboot the module if it fails to identify SIM


  • Use command AT+CREG to check GSM connection:
...
AT+CREG?
+CREG: 0,1
OK
...

Note: OK means that the module has registered on CS domain service


  • Use command AT+CGREG to check PS Service:
...
AT+CGREG?
+CGREG: 0,1
OK
...

Note: OK means that the module has registered in UMTS/LTE network


  • Use command AT+QICSGP to configure APN, user name, password and auth type:
AT+QICSGP=<contextID>[,<context_type>,<APN>[,<username>,<password>)[,<authentication>]]]

<context type> The protocol type (1 – IPV4; 2 – IPv6);

<context id> The range is 1-16;

<authentication> The authentication methods (0 – NONE; 1 – PAP; 2 – CHAP; 3-PAP or CHAP).

Example: AT+QICSGP=1,1,"APN_Name","","",1

...
AT+QICSGP=1,1"bangapro","","",1
OK
...

  • Use command AT+QIACT=<contextID> to activate a PDP context:
...
AT+QIACT=1
OK
...

  • Use command AT+QIACT? to query IP Address of the PDP context:
...
AT+QIACT?
+QIACT: 1,1,1,"88.77.66.55"
OK
...

Note: try and activate a PDP context a few times. If failed, then reboot the module.


  • Use command AT+QIOPEN to open connection:
...
AT+QIOPEN
OK
...

Note: if failed – deactivate PDP context - use command AT+QIDEACT=<context ID> to deactivate PDP context.


  • Use command AT+QPING to ping a Remote Server:
...
AT+QPING=1,"8.8.8.8"
OK
+QPING: 0,"8.8.8.8",32,54,255
+QPING: 0,"8.8.8.8",32,30,255
+QPING: 0,"8.8.8.8",32,35,255
+QPING: 0,"8.8.8.8",32,34,255
+QPING: 0,4,4,0,30,54,37
...

1 –The context ID. The range is 1-16;

8.8.8.8 - The host address in string type.

Note: if ping a remote server successfully, response is OK (means that the module works properly). If there is any error, response is ERROR (means the problem is in the module).

Example for the provided configuration

...
root@Teltonika:~# ifdown ppp
root@Teltonika:~# /etc/init.d/gsmd stop
root@Teltonika:~# microcom /dev/modem_cmd
+QCSQ: "LTE",47,-75,166,-10
+QCSQ: "LTE",47,-75,161,-10
+QCSQ: "LTE",47,-75,156,-10
+CREG: 1,"008B","012CD17",7
AT+QCSQ=0
OK
+CREG: 1,"008B","012CD0D",7
+CREG: 1,"008B","012CD17",7
AT+CREG=0
OK
AT
OK
...
...
AT+CPIN?
+CPIN: READY
OK
AT+CREG
OK
AT+CREG?
+CREG: 0,1
OK
AT+CREG
OK
AT+CGREG?
+CGREG: 0,1
OK
AT+QICSGP=1,1"bangapro","","",1
OK
AT+QIACT=1
OK
AT+QIACT?
+QIACT: 1,1,1,"88.77.66.55"
OK
...
...
AT+QIOPEN
OK
AT+QPING=1,"8.8.8.8"
OK
+QPING: 0,"8.8.8.8",32,54,255
+QPING: 0,"8.8.8.8",32,30,255
+QPING: 0,"8.8.8.8",32,35,255
+QPING: 0,"8.8.8.8",32,34,255
+QPING: 0,4,4,0,30,54,37
...