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Question


How do I troubleshoot the GSM Modem / GSM Gateway / GSM Terminal?

Answer


Recommendations:

Connect the modem directly to the op5 Monitor server instead of using a Ethernet over Serial solution. This will guarantee that notifications can be sent even if the local network goes down.

 

Troubleshooting Steps:

1. Try to manually send yourself an SMS:

root@monitor:~# smssend 46733333333 'Test'

Replace 46 with your country code. It may take a couple of minutes for the text message to reach your phone.

 

2. Check that the SMS daemon is running. You should get the following output with one or two random PID numbers at the end:

root@monitor:~# service smsd status
smsd is running with pid: 2550 2544

 

3. Check how often the modem LED is blinking. Please read the "Overview of LED Operating Status" below for details.

 

4. Check the SMS daemon log for error messages by running:

root@monitor:~# grep -i "error" /var/log/smsd.log

The command above might find an error line like this:

2011-12-08 13:42:56,3, GSM1: Error: Modem is not registered to the network

This could be three different problems:

  • The GSM signal is too weak.
  • The SIM card is missing.
  • The PIN code is incorrect or isn't configured.

5. If the server is a brand new op5 Appliance machine from Dell, the COM1 port may be redirected to iDRAC.

root@monitor:~# omreport chassis biossetup

If you get output saying:

Serial Communication
------------------------------------------
Serial Communication : On without Console Redirection
Serial Port Address : Serial Device1=COM2,Serial Device2=COM1
External Serial Connector : Serial Device 1
Failsafe Baud Rate : 115200
Remote Terminal Type : VT100/VT220
Redirection After Boot : Enabled

Run the following command:

root@monitor:~# omconfig chassis biossetup attribute=SerialPortAddress setting=Serial1Com1Serial2Com2

The output from the omreport command above should now say:

Serial Communication
------------------------------------------
Serial Communication : On without Console Redirection
Serial Port Address : Serial Device1=COM1,Serial Device2=COM2
External Serial Connector : Serial Device 1
Failsafe Baud Rate : 115200
Remote Terminal Type : VT100/VT220
Redirection After Boot : Enabled

 

Overview of LED Operating Status for Siemens MC35i / Cinterion TC65:

Operating statusThe blue/green LED is
Power downOff
Not registered to the GSM net (missing SIM card, and/or no/incorrect PIN code, and/or too weak GSM signal)Blinking once every second
Standby (registered to the GSM net)Blinking once every third second
Sleep mode (power save mode and registered to the GSM net)Off
Talk modeOn

Overview of LED Operating Status for CEP HT910G:

Operating statusThe green middle LED is
Power downOff
Not registered to the GSM net (searching, and/or too weak GSM signal)Blinking once every second
Standby (registered to the GSM net)Blinking once every third second
Not registered (no/incorrect PIN code, rejected SIM card, other reasons)On

6. Go through our guide for how to test your modem using Minicom.