January 6th, 2013, 07:43 PM
Kannel sms gateway has not been developed for over 2 years, so I would be careful about developing anything using that platform as it may be a dead end.
If you do not want to use an SMS service provider, which you pay a monthly fee to and outsrouce all of the SMS headaches then you can setup a PC to GSM phone connection and go down that route.
Check if your GSM phone supports SMS text mode AT commands.
You need a GSM phone that allows PC connection through USB cable or bluetooth connection.
For USB connection you will require a USB serial driver from the phone vendor.
For bluetooth you can try and add it add new hardware. Once the connection between PC and phone is setup you can communicate with the phone using AT commands.
To check if your modem supports this SMS text mode, you can try the following command:
If you get an OK repsonse then you can use the CSMP configuration command and CGMS send message command.
To create a C# program for this is too vague at this stage until the hardware and software setup and configuration information is known.