I am trying to send and receive string data to socket connection via telnet, but I am not able to type or see anything in the telnet window. I am able to connect to the server via telnet, but not able to send the string data.
Is there any other alternate method to send string data over socket connection.
Telnet, unless it negotiates parameters to the contrary, does "remote echo" meaning that you won't see anything you type unless the server echos it back.
A lot of people use the term "Telnet" when really it is a raw socket connection that does no configuration negotiation upon connect.
If you're sending data from a file or source other than the keyboard (and even often when sending from the keyboard), you're better of using a program like socket or nc (netcat) which don't attempt to do any processing of the data stream and so provide simple 8-bit clean connections.
In the case of both those problems, you can simply redirect stdin from a file or echo a string to them through a pipe.