479
edits
Changes
Mobile data connection troubleshooting (view source)
Revision as of 21:09, 19 May 2020
, 21:09, 19 May 2020Created page with "This is a quick guide to help engineers in the debugging process of a router if they encounter issues with mobile data connection. 1. Connect to router via CLI/SSH (use SSH so..."
This is a quick guide to help engineers in the debugging process of a router if they encounter issues with mobile data connection.
1. Connect to router via CLI/SSH (use SSH software such as Putty):
• CLI/SSH login: root
• CLI/SSH password: <your router’s password>
2. Connect to mobile module of the router:
• 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:
• AT+QIACT=<contextID>
11. Query IP Address of the PDP context:
• 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:
1. Connect to router via CLI/SSH (use SSH software such as Putty):
• CLI/SSH login: root
• CLI/SSH password: <your router’s password>
2. Connect to mobile module of the router:
• 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:
• AT+QIACT=<contextID>
11. Query IP Address of the PDP context:
• 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:
