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Mobile data connection troubleshooting (view source)

Revision as of 15:59, 22 May 2020

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Protected "Mobile data connection troubleshooting" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite))
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__TOC__
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 +
==Summary==
 
This is a quick guide to help in the debugging process of a router if encounters issues with mobile data connection.
 
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):
+
* 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 username: root
 
  CLI/SSH password: <your router’s password>
 
  CLI/SSH password: <your router’s password>
−
 
+
----
 
* Connect to mobile module of the router:
 
* Connect to mobile module of the router:
 
  ...  
 
  ...  
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  +CREG: 1,"008B","012CD17",7
 
  +CREG: 1,"008B","012CD17",7
 
  ...
 
  ...
−
 
+
----
−
* Most likely you will not see anything and that’s because screen echo might 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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  OK
 
  OK
 
  ...
 
  ...
−
 
+
----
−
* Check communication (wait for the module to respond OK):
+
* Check communication (wait for the module to respond '''OK'''):
 
  ...  
 
  ...  
 
  AT
 
  AT
 
  OK
 
  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>]]]
   −
* Now it is ready for debugging process Query SIM card status:
+
''<context type>'' The protocol type (1 – IPV4; 2 – IPv6);
−
• AT+CPIN?
  −
5. If PIN is required, initialize modem with your PIN code:
  −
• AT+CPIN="xxxx"
  −
6. Check SIM card status again (Reboot the module if it fails to identify SIM):
  −
• AT+CPIN?
  −
7. Check GSM connection (OK means that the module has registered on CS domain service):
  −
• AT+CREG
  −
8. Check PS Service (OK means that the module has registered in UMTS/LTE network)
  −
• AT+CGREG
  −
9. Configure APN, user name, password and auth type by AT+QICSGP
  −
• 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
     −
10. Activate a PDP context:
+
''<context id>'' The range is 1-16;
−
• AT+QIACT=<contextID>
     −
11. Query IP Address of the PDP context:
+
''<authentication>'' The authentication methods (0 – NONE; 1 – PAP; 2 – CHAP; 3-PAP or CHAP).
−
• AT+QIACT?
  −
(*Try and activate a PDP context a few times. If failed, then reboot the module).
  −
12. Open connection:
  −
• AT+QIOPEN
  −
(*If failed – deactivate PDP context - use command AT+QIDEACT=<context ID> to deactivate PDP context.)
  −
13. Use AT commands to ping a Remote Server
  −
• AT+QPING=1,"8.8.8.8"
  −
*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:
  −
• If ping a remote server successfully, response: OK (means that the module works properly)
  −
• If there is any error, response: ERROR (means the problem is in the module)
     −
Example fo the provided configuration:
+
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
 +
...
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