When I do the following steps to receive a message and send a reply, it fails. I am using TCP. I need the program to send data from the same port it received from.
bind() listen() accept() recv() connect()//it fails to connect here using the same socket.<br> send() It seems you have a problem in understanding the way tcp works. There is a server and a client. The server waits for connections, and the client makes connections. Once a connection is established, the server and the client can communicate bi-directional (i.e. both can send and recive messages). Of course, their role might change, but this is the way it works. So, the server does:
bind() listen() accept() recv() send() It is stuck at accept() until a client performs connect() on the port that the server is listening to.
As my explanation is pretty brief, I suggest you read this tutorial about linux sockets.
