C program GSM modem

Hello experts,

How can i interact with GSM modem to send the message to the particular mobile using C program? I am working on UBUNTU system GCC package.

Any help is appreciated,

abhimohpra

Hey there
Have a look at this device:
https://www.sparkfun.com/products/9427

and then this app note
http://www.sparkfun.com/datasheets/C...App%20Note.pdf

I have SIMCOM-300 Module with RS232 interface DB port. Is there any generic instruction set available to send the message (AT commands) to any modem through C program?

The Hays command set (AT commands) are supposed to be standardised, but I've found that they (frustratingly) slightly vary from modem to modem. You need to include the modem name in a Google search for the AT commands to get the specific instructions used

Also, it might be a good idea to research what other people have done with your modem on Google as a starting point

The search string that I typed in was SIMCOM-300 SMS which dug up quite a few good examples

If your modem provides a /dev/modem device in Ubuntu, you can just talk directly to it by opening the device file and sending AT commands and reading back the results.

Gammu is a project that automates this for you if you don't want to program it yourself, want to use an established library, or just want to see how they do it. I use it to run the SMS gateway for a small school - we do everything from act on remote authenticated commands (e.g. reboot server from a text message), to converting SMS to emails, to sending out notifications to parents, and even use the GSM modem as a 3G connection when the Internet goes down.

So long as your modem provides a /dev/ device, it should be no more difficult than talking to an ordinary old-fashioned modem (hell, it even uses the same programs for the most part - minicom, pppd, etc.) which is no more difficult than opening and writing to / reading from a file.