Prerequisites

Use 2G / GSM instead of 3G. The 3G network is less reliable and isn't currently supported by op5.

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 send a SMS to yourself:
   sendsms 46733333333 'Test'
   
   It usually takes a couple of minutes to reach your mobile.
   Note that, if you send the SMS in another country than Sweden, change the 46 prefix.
   
   
2. Check that the SMS daemon is running:
   service smsd status
   
   You should get the following with one or two random PID numbers at the end:
   
   smsd is running with pid: 2550 2544.
3. Use a mobile phone to check the signal strength. Make sure you are using 2G / GSM instead of 3G. Preferably use a simple 2G mobile phone instead of 3G enabled phone to make sure you are not using 3G.
   
   
4. Check how often the modem is blinking. It should blink once every third seconds. Please read the "Overview of LED Operating Status" below for details.
   
   
5. Check the SMS daemon log error messages by running this:
   grep -i "error" /var/log/smsd.log
   
   If you 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.

Overview of LED Operating Status