Socket communications

[Stefano Covino]

Thank you a lot for you ready answer.

Basically, what I want to implement is a very simple protocol. I need to 
send fixed-length messages, and getting and answer again of fixed-length. 
The communication should be effective on both side.

I do not know which protocol I should apply. This is the first time I try 
study this problem and I am still lacking of even the vocabulary.
In principle a telnet (or ssh) like protocol should work, but I need an as 
quick as possible connection. The messages are coming from previously 
defines IP addresses, and I do not need to recognize the user.

        Stefano