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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__
 +
 +
==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 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
 +
...
 
----
 
----
−
1. Connect to router via CLI/SSH (use SSH software such as Putty):
+
* Use command '''AT+QIACT?''' to query IP Address of the PDP context:
−
• CLI/SSH login: root
+
...
−
• CLI/SSH password: <your router’s password>
+
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.
   −
2. Connect to mobile module of the router:
+
'''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).
−
• ifdown ppp
  −
• /etc/init.d/gsmd stop
  −
• microcom /dev/modem_cmd
  −
• ATE1
  −
• at+qcsq=0
  −
(*most likely you will not see anything and that’s because screen echo might be disabled. ATE1 will enable it so that you can see what you write. at+qcsq=0 command stops showing unnecessary output)
  −
3. Check communication (wait for the module to respond OK):
  −
• AT
  −
4. Query SIM card status:
  −
• 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:
+
==Example for the provided configuration==
−
• AT+QIACT=<contextID>
+
...
 +
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
 +
...
   −
11. Query IP Address of the PDP context:
+
...
−
• AT+QIACT?
+
AT+CPIN?
−
(*Try and activate a PDP context a few times. If failed, then reboot the module).
+
+CPIN: READY
−
12. Open connection:
+
OK
−
• AT+QIOPEN
+
AT+CREG
−
(*If failed – deactivate PDP context - use command AT+QIDEACT=<context ID> to deactivate PDP context.)
+
OK
−
13. Use AT commands to ping a Remote Server
+
AT+CREG?
−
• AT+QPING=1,"8.8.8.8"  
+
+CREG: 0,1
−
*1 –The context ID. The range is 1-16;
+
OK
−
*8.8.8.8 - The host address in string type. The format is a dotted decimal IP address.
+
AT+CREG
−
Response:
+
OK
−
• If ping a remote server successfully, response: OK (means that the module works properly)
+
AT+CGREG?
−
• If there is any error, response: ERROR (means the problem is in the module)
+
+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
 +
...
   −
Example fo the provided configuration:
+
...
 +
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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