ØMQ (Zero MQ)

ZeroMQ is a socket library that allows developers to create distributed, concurrent, queue based messaging systems with high availability.  One of the many benefits is the abstraction of dealing with sockets at a queue and atomic message level.

It’s really simple to use, here is an example:

Client

namespace Client
{
    using System;
    using System.Text;

    class Program
    {
        static void Main()
        {
            using (var ctx = new ZMQ.Context(1))
            {
                var socket = ctx.Socket(ZMQ.REQ);
                socket.Connect("tcp://localhost:5555");

                while (true)
                {
                    socket.Send(Encoding.ASCII.GetBytes("Hello"));

                    byte[] message;
                    socket.Recv(out message);

                    Console.WriteLine(Encoding.ASCII.GetString(message));
                }
            }
        }
    }
}

Server

namespace Server
{
    using System;
    using System.Text;

    class Program
    {
        static void Main()
        {
            using (var ctx = new ZMQ.Context(1))
            {
                var socket = ctx.Socket(ZMQ.REP);
                socket.Bind("tcp://*:5555");

                while (true)
                {
                    byte[] message;
                    socket.Recv(out message);

                    Console.WriteLine(Encoding.ASCII.GetString(message));

                    socket.Send(Encoding.ASCII.GetBytes("World"));
                }
            }
        }
    }
}

This sample was taken from the internet but you can download a snapshot of the source here:

http://stevenhollidge.com/blog-source-code/ZeroMqDemo.zip