Hi all, my problem has been solved, therefore I am posting it here for help of others. I was getting no response from device error because I was using the wrong port in my code. The device was not on that port. The other error I faced was "socket write error". This error comes when two threads are trying to use the same port simultaneously. This error was occurring because I was when I connected the modem with my computer I opened the modem's application too. That is why the socket error was occurring. Both modem's application and my SMS lib application were trying to use the same port at the same time. Therefore, if you get the same error then ensure that you have closed the modem's UI application.
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