public void RouterDealerMessaging() { using (var server = new RouterSocket()) using (var client = new DealerSocket()) { int port = server.BindRandomPort("tcp://127.0.0.1"); client.Connect("tcp://127.0.0.1:" + port); var clientOutgoingMessage = new NetMQMessage(); clientOutgoingMessage.Append("Hello"); client.SendMultipartMessage(clientOutgoingMessage); NetMQMessage serverIncomingMessage = server.ReceiveMultipartMessage(); // number of frames should be one because first message should be identity of client Assert.AreEqual(2, serverIncomingMessage.FrameCount); Assert.AreEqual("Hello", serverIncomingMessage[1].ConvertToString()); var serverOutgoingMessage = new NetMQMessage(); // first adding the identity serverOutgoingMessage.Append(serverIncomingMessage[0]); serverOutgoingMessage.Append("World"); server.SendMultipartMessage(serverOutgoingMessage); var incomingClientMessage = client.ReceiveMultipartMessage(); Assert.AreEqual(1, incomingClientMessage.FrameCount); Assert.AreEqual("World", incomingClientMessage[0].ConvertToString()); } }