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POC / how to bind multiple sockets for incoming and outgoing data
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  1. POC / how to bind multiple sockets for incoming and outgoing data
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    copied!<p>I discovered a problem in my code when I try to bind multiple sockets. I try to explain the situation, I have an application consisting of two parts, one is written in C running on machine_1, the other one is in Java running on machine_2. The C program should be able to send udp-packets through one port to 4 ports on the machine_2 which is listening on them. Vice versa machina_2 should send udp-packets through one outgoing port to 4 corresponding ports on machine_1.</p> <p>The problem I have is on machine_1:</p> <ol> <li>I have two threads there, one processing outgoing data to machine_2 and one processing the incoming data. Within the first thread (processing outgoing data) I create 4 sockets (with 4 different ports) to address the corresponding sockets on machine_2. Works fine in that direction...</li> <li>But when I try to create the sockets for the incoming data from machine_2, and I want to use the same port numbers as I did for incoming data on machine_2, but then I run into problems when I try to bind the sockets. Giving me the <code>: Address already in use</code> error.</li> </ol> <p>I need some help on how to set up the socket configuration on machine_1 inside the C application for outgoing and incoming ports. And maybe an example on how to use the <code>select()</code> function to listen on all 4 incoming sockets.</p> <p>If come code examples needed, I can add them here, but as I said it is only working for the thread_1 which handles the outgoing data through one socket to 4 different sockets on machine_2.</p> <p>Thanks in advance for your help!</p> <p>I hope the attached picture can explain the situation little bit more, important is that I want to use the same port numbers on both machines for incoming data. Means, port_1 on machine_1 has same port number than port_1 on machine_2, and so on...<img src="https://i.stack.imgur.com/QqH03.png" alt="port_configuration"></p>
 

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