public void ValidateUadpPubSubConnectionNetworkMessagePublishMulticast()
        {
            //Arrange
            var localhost = GetFirstNic();

            Assert.IsNotNull(localhost, "localhost is null");
            Assert.IsNotNull(localhost.Address, "localhost.Address is null");

            //create publisher configuration object with modified port
            PubSubConfigurationDataType publisherConfiguration = UaPubSubConfigurationHelper.LoadConfiguration(PublisherConfigurationFileName);

            Assert.IsNotNull(publisherConfiguration, "publisherConfiguration is null");

            IPAddress multicastIPAddress = new IPAddress(new byte[4] {
                239, 0, 0, 1
            });

            Assert.IsNotNull(multicastIPAddress, "multicastIPAddress is null");

            NetworkAddressUrlDataType publisherAddress = new NetworkAddressUrlDataType();

            publisherAddress.Url = "opc.udp://" + multicastIPAddress.ToString() + ":4840";
            publisherConfiguration.Connections[0].Address = new ExtensionObject(publisherAddress);

            //create publisher UaPubSubApplication with changed configuration settings
            UaPubSubApplication publisherApplication = UaPubSubApplication.Create(publisherConfiguration);

            Assert.IsNotNull(publisherApplication, "publisherApplication is null");

            UadpPubSubConnection publisherConnection = publisherApplication.PubSubConnections[0] as UadpPubSubConnection;

            Assert.IsNotNull(publisherConnection, "publisherConnection is null");

            // will signal that the uadp message was received from local ip
            m_shutdownEvent = new ManualResetEvent(false);

            //setup uadp client for receiving from multicast (simulate a subscriber multicast)
            UdpClient udpMulticastClient = new UdpClientMulticast(localhost.Address, multicastIPAddress, 4840);

            udpMulticastClient.BeginReceive(new AsyncCallback(OnReceive), udpMulticastClient);

            // prepare a network message
            WriterGroupDataType writerGroup0   = publisherConnection.PubSubConnectionConfiguration.WriterGroups[0];
            UaNetworkMessage    networkMessage = publisherConnection.CreateNetworkMessage(writerGroup0);

            //Act
            publisherConnection.Start();
            publisherConnection.PublishNetworkMessage(networkMessage);

            //Assert
            if (!m_shutdownEvent.WaitOne(EstimatedPublishingTime))
            {
                Assert.Fail("The UADP message was not received");
            }

            publisherConnection.Stop();
            udpMulticastClient.Close();
            udpMulticastClient.Dispose();
        }
        public void ValidateUadpPubSubConnectionNetworkMessageReceiveFromUnicast()
        {
            // Arrange
            var localhost = GetFirstNic();

            Assert.IsNotNull(localhost, "localhost is null");
            Assert.IsNotNull(localhost.Address, "localhost.Address is null");

            PubSubConfigurationDataType subscriberConfiguration = UaPubSubConfigurationHelper.LoadConfiguration(SubscriberConfigurationFileName);

            Assert.IsNotNull(subscriberConfiguration, "subscriberConfiguration is null");

            NetworkAddressUrlDataType subscriberAddress = new NetworkAddressUrlDataType();

            subscriberAddress.Url = "opc.udp://" + localhost.Address.ToString() + ":4840";
            subscriberConfiguration.Connections[0].Address = new ExtensionObject(subscriberAddress);
            UaPubSubApplication subscriberApplication = UaPubSubApplication.Create(subscriberConfiguration);

            Assert.IsNotNull(subscriberApplication, "subscriberApplication is null");

            UadpPubSubConnection subscriberConnection = subscriberApplication.PubSubConnections[0] as UadpPubSubConnection;

            Assert.IsNotNull(subscriberConnection, "subscriberConnection is null");

            subscriberConnection.UadpMessageReceived += DataReceived;

            PubSubConfigurationDataType publisherConfiguration = UaPubSubConfigurationHelper.LoadConfiguration(PublisherConfigurationFileName);

            Assert.IsNotNull(publisherConfiguration, "publisherConfiguration is null");

            NetworkAddressUrlDataType publisherAddress = new NetworkAddressUrlDataType();

            publisherAddress.Url = "opc.udp://" + localhost.Address.ToString() + ":4840";
            publisherConfiguration.Connections[0].Address = new ExtensionObject(publisherAddress);
            UaPubSubApplication publisherApplication = UaPubSubApplication.Create(publisherConfiguration);

            Assert.IsNotNull(publisherApplication, "publisherApplication is null");

            UadpPubSubConnection publisherConnection = publisherApplication.PubSubConnections[0] as UadpPubSubConnection;

            Assert.IsNotNull(publisherConnection, "publisherConnection is null");

            //Act
            subscriberConnection.Start();
            m_shutdownEvent = new ManualResetEvent(false);

            // physical network ip is mandatory on UdpClientUnicast as parameter
            UdpClient udpUnicastClient = new UdpClientUnicast(localhost.Address, 4840);

            Assert.IsNotNull(udpUnicastClient, "udpUnicastClient is null");

            // first physical network ip = unicast address ip
            IPEndPoint remoteEndPoint = new IPEndPoint(localhost.Address, 4840);

            Assert.IsNotNull(remoteEndPoint, "remoteEndPoint is null");

            m_sentBytes = PrepareData(publisherConnection);
            int sentBytesLen = udpUnicastClient.Send(m_sentBytes, m_sentBytes.Length, remoteEndPoint);

            Assert.AreEqual(sentBytesLen, m_sentBytes.Length, "Sent bytes size not equal to published bytes size!");

            Thread.Sleep(EstimatedPublishingTime);

            // Assert
            if (!m_shutdownEvent.WaitOne(EstimatedPublishingTime))
            {
                Assert.Fail("Subscriber unicast error ... published data not received");
            }

            subscriberConnection.Stop();
        }