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private void StartListening()
{
    //udp.Client.Bind();
    ar_ = udp.BeginReceive(Receive, new object());
    udp.Client.ReceiveTimeout = 50000;
    if (IPback.Length > 1)
        SendtoTable();
}

private void Receive(IAsyncResult ar)
{
    UdpClient client = new UdpClient();
    Messageback = "";
    IPback = "";

    IPEndPoint ip = new IPEndPoint(IPAddress.Broadcast, PORT_NUMBERReceive);

    byte[] bytes = udp.EndReceive(ar, ref ip);
    string message = Encoding.ASCII.GetString(bytes);
    Console.WriteLine("From {0} received: {1} ", ip.Address.ToString(), message);

    Messageback = message;
    IPback = ip.Address.ToString();

    StartListening();
}					

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Threading;


namespace SchneidConfigTool
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();


            this.listView1.View = View.Details;

            // Anzeigeheader im listview1 Spalten 
            listView1.Columns.Add(new ColHeader("Quelle", 110, HorizontalAlignment.Left, true));
            listView1.Columns.Add(new ColHeader("Name", 110, HorizontalAlignment.Left, true));
            listView1.Columns.Add(new ColHeader("Type", 70, HorizontalAlignment.Left, true));

            // Add the data.
            /*listView1.Items.Add(new ListViewItem(new string[] { "192.168.0.1", "MeinModul1", "Tibbo" }));
            listView1.Items.Add(new ListViewItem(new string[] { "192.168.0.2", "MeinModul2", "TCP09" }));
            listView1.Items.Add(new ListViewItem(new string[] { "192.168.0.3", "MeinModul3", "TCP09" }));
            listView1.Items.Add(new ListViewItem(new string[] { "192.168.0.11", "2", "TCP09" }));
            listView1.Items.Add(new ListViewItem(new string[] { "192.168.0.13", "6", "Tibbo" }));
            listView1.Items.Add(new ListViewItem(new string[] { "192.168.0.12", "7", "RF-LP" }));
            listView1.Items.Add(new ListViewItem(new string[] { "192.168.0.111", "1", "RF-LP" }));
            listView1.Items.Add(new ListViewItem(new string[] { "192.168.0.114", "5", "RF-HP" }));
            */
            // Connect the ListView.ColumnClick event to the ColumnClick event handler.
            this.listView1.ColumnClick += new ColumnClickEventHandler(listView1_ColumnClick);
        }
        public class TCP08VALUE
        {
            private string name; // This is the so-called "backing field"
            public string Name // This is your property
            {
                get { return name; }
                set { name = value; }
            }
        }
        TCP08VALUE MA = new TCP08VALUE();
        TCP08VALUE MC = new TCP08VALUE();
        TCP08VALUE VR = new TCP08VALUE();
        TCP08VALUE ST = new TCP08VALUE();
        TCP08VALUE MN = new TCP08VALUE();

        public class SortWrapper
        {
            internal ListViewItem sortItem;
            internal int sortColumn;


            // A SortWrapper requires the item and the index of the clicked column.
            public SortWrapper(ListViewItem Item, int iColumn)
            {
                sortItem = Item;
                sortColumn = iColumn;
            }

            // Text property for getting the text of an item.
            public string Text
            {
                get
                {
                    return sortItem.SubItems[sortColumn].Text;
                }
            }

            // Implementation of the IComparer
            // interface for sorting ArrayList items.
            public class SortComparer : IComparer
            {
                bool ascending;

                // Constructor requires the sort order;
                // true if ascending, otherwise descending.
                public SortComparer(bool asc)
                {
                    this.ascending = asc;
                }

                // Implemnentation of the IComparer:Compare
                // method for comparing two objects.
                public int Compare(object x, object y)
                {
                    SortWrapper xItem = (SortWrapper)x;
                    SortWrapper yItem = (SortWrapper)y;

                    string xText = xItem.sortItem.SubItems[xItem.sortColumn].Text;
                    string yText = yItem.sortItem.SubItems[yItem.sortColumn].Text;
                    return xText.CompareTo(yText) * (this.ascending ? 1 : -1);
                }
            }
        }

        public class ColHeader : ColumnHeader
        {
            public bool ascending;
            public ColHeader(string text, int width, HorizontalAlignment align, bool asc)
            {
                this.Text = text;
                this.Width = width;
                this.TextAlign = align;
                this.ascending = asc;
            }
        }

        private void listView1_ColumnClick(object sender, ColumnClickEventArgs e)
        {

            // Create an instance of the ColHeader class.
            ColHeader clickedCol = (ColHeader)this.listView1.Columns[e.Column];

            // Set the ascending property to sort in the opposite order.
            clickedCol.ascending = !clickedCol.ascending;

            // Get the number of items in the list.
            int numItems = this.listView1.Items.Count;

            // Turn off display while data is repoplulated.
            this.listView1.BeginUpdate();

            // Populate an ArrayList with a SortWrapper of each list item.
            ArrayList SortArray = new ArrayList();
            for (int i = 0; i < numItems; i++)
            {
                SortArray.Add(new SortWrapper(this.listView1.Items[i], e.Column));
            }

            SortArray.Sort(0, SortArray.Count, new SortWrapper.SortComparer(clickedCol.ascending));

            // Clear the list, and repopulate with the sorted items.
            this.listView1.Items.Clear();
            for (int i = 0; i < numItems; i++)
                this.listView1.Items.Add(((SortWrapper)SortArray[i]).sortItem);

            // Turn display back on.
            this.listView1.EndUpdate();
        }


        //GM UDP Broadcastreciver
        /// <summary>
        /// ////////////////////////////////////////UDP//////////////
        /// </summary>


        String[] TCP08COMANDS = { "MC", "VR", "MN", "UN", "ST", "IM", "OP", "DD", "CP", "PO", "DG", "KA", "KI", "KE", "RI", "LI", "SM", "GW", "DS", "PI", "PP", "DX", "DP", "DI", "DW", "DH", "LP", "RP", "RH", "BR", "DB", "PR", "SB", "FL", "IT", "PT", "PS", "PD", "TE", "SS", "NP", "SP" };

        const int PORT_NUMBERSend = 50001;
        public int PORT_NUMBERReceive;
        public int Port { get; set; }
        public String Messageback = "";
        public String IPback = "";

        Thread t = null;
        public void Start()
        {
            if (t != null)
            {
                throw new Exception("Already started, stop first");
            }
            Console.WriteLine("Started listening");
            StartListening();

        }
        public void Stop()
        {
            try
            {
                udp.Close();
                Console.WriteLine("Stopped listening");
            }
            catch { /* don't care */ }
        }

        /*private readonly*/

        UdpClient udp = new UdpClient(50001);
        Socket sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        IPEndPoint ip = new IPEndPoint(IPAddress.Parse("255.255.255.255"), PORT_NUMBERSend);

        IAsyncResult ar_ = null;

        private void StartListening()
        {
            //udp.Client.Bind();
            ar_ = udp.BeginReceive(Receive, new object());
            udp.Client.ReceiveTimeout = 50000;
            if (IPback.Length > 1)
                SendtoTable();
        }
        private void Receive(IAsyncResult ar)
        {
            UdpClient client = new UdpClient();
            Messageback = "";
            IPback = "";

            IPEndPoint ip = new IPEndPoint(IPAddress.Broadcast, PORT_NUMBERReceive);

            byte[] bytes = udp.EndReceive(ar, ref ip);
            string message = Encoding.ASCII.GetString(bytes);
            Console.WriteLine("From {0} received: {1} ", ip.Address.ToString(), message);

            Messageback = message;
            IPback = ip.Address.ToString();


            StartListening();
        }

      
      
        public void Sendbyte(byte[] message)
        {

            UdpClient client = new UdpClient();
            IPEndPoint ip = new IPEndPoint(IPAddress.Parse("255.255.255.255"), PORT_NUMBERSend);

            byte[] bytes = message;



            
            client.Send(bytes, bytes.Length, ip);

            PORT_NUMBERReceive = ((System.Net.IPEndPoint)(client.Client.LocalEndPoint)).Port;
            StartListening();
            Console.WriteLine("Source Port: {0}", PORT_NUMBERReceive.ToString());
            Console.WriteLine("Destination Port: {0}", PORT_NUMBERSend.ToString());
            
        }



        private void SendtoTable()
        {

            this.Invoke((MethodInvoker)delegate
            {

                //GM Test
                textBox2.Text = ("VON " + IPback + " MSG " + Messageback);

                //Erzeuge Einträge
                listView1.Items.Add(new ListViewItem(new string[] { IPback, Messageback, "TCP08" }));

            });
        }
        //public static bool messageReceived = false;

        //public static void ReceiveCallback(IAsyncResult ar)
        //{
        //    UdpClient u = (UdpClient)((UdpState)(ar.AsyncState)).u;
        //    IPEndPoint e = (IPEndPoint)((UdpState)(ar.AsyncState)).e;

        //    Byte[] receiveBytes = u.EndReceive(ar, ref e);
        //    string receiveString = Encoding.ASCII.GetString(receiveBytes);

        //    Console.WriteLine("Received: {0}", receiveString);
        //    messageReceived = true;
        //}

        //public static void ReceiveMessages()
        //{
        //    // Receive a message and write it to the console.
        //    IPEndPoint e = new IPEndPoint(IPAddress.Any, PORT_NUMBERReceive);
        //    UdpClient u = new UdpClient(e);

        //    UdpState s = new UdpState();
        //    s.e = e;
        //    s.u = u;

        //    Console.WriteLine("listening for messages");
        //    u.BeginReceive(new AsyncCallback(ReceiveCallback), s);

        //    // Do some work while we wait for a message. For this example,
        //    // we'll just sleep
        //    while (!messageReceived)
        //    {
        //        Thread.Sleep(100);
        //    }
        //}



        public String SearchMSG08()
        {
            String ret = "";
            int lengmsg = TCP08COMANDS.Length;


            for (int i = 0; i < lengmsg; i++)
                ret += TCP08COMANDS[i] + "\r\n";

            return ret;

        }

        public byte[] prefix_MA(string mac)
        {

            byte[] ret = new byte[10];
            ret[0] = 0x4d; //M
            ret[1] = 0x41; //A
            char[] delimiterChars = { ':' };

            string[] s = mac.Split(delimiterChars);

            if (s.Length == 6)
            {
                for (Int16 i = 0; i <= 5; i++)
                {
                    ret[2 + i] = (byte)Convert.ToInt32(s[i], 16);
                }
            }
            else
            {
                for (Int16 i = 0; i <= 5; i++)
                {
                    ret[2 + i] = 0xff;
                }
            }
            ret[8] = 0xd;
            ret[9] = 0xa;

            return ret;


        }

        public byte[] SearchMSG08Byte(String PW)
        {

            String msg = "";

            if (PW.Length == 0) PW = " ";


            int lengmsg = TCP08COMANDS.Length;


            for (int i = 0; i < lengmsg; i++)
                msg += TCP08COMANDS[i] + "\r\n";


            msg = "PW" + PW + "\r\n" + msg;


            byte[] bMsg = System.Text.Encoding.ASCII.GetBytes(msg);
            byte[] ret = new byte[10 + bMsg.Length];
            byte[] tmp = prefix_MA("FF:FF:FF:FF:FF:FF");
            //byte[] tmp = prefix_MA("00:08:DC:1E:C7:A9");

            Array.ConstrainedCopy(tmp, 0, ret, 0, 10);
            Array.ConstrainedCopy(bMsg, 0, ret, 10, bMsg.Length);

            return ret;

        }

        public void TCP08CON(string ipdest)
        {
            //listView1.Items.Clear();

            IPEndPoint ep = new IPEndPoint(IPAddress.Parse(ipdest), 50001);
            Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            sock.SendTimeout = 50;
            sock.ReceiveTimeout = 50;
            if (null != sock)
            {
                try
                {
                    sock.Connect(ep);
                    if (sock.Connected)
                    {

                        // Blocks until send returns.
                        int bytesSent = sock.Send(SearchMSG08Byte(""));
                        Console.WriteLine("Sent {0} bytes.", bytesSent);
                        //get the first 4 bytes, should be the lenngth of the rest of the response.
                        byte[] response = new byte[4];
                        int bytesRec = sock.Receive(response);
                        int totalBytesRec = 0;
                        if (4 == bytesRec)
                        {
                            int len = BitConverter.ToInt32(response, 0);
                            response = new byte[len];
                            Console.WriteLine("Trying to get {0} bytes.", len);
                            bytesRec = 0;

                            do
                            {
                                bytesRec = sock.Receive(response);
                                totalBytesRec += bytesRec;
                                //forecast += Encoding.ASCII.GetString(response, 0, bytesRec);

                                string message = Encoding.ASCII.GetString(response, 0, bytesRec);
                                Console.WriteLine("Data {0}  ", message);
                                parsingMsg(message);

                            } while (totalBytesRec < len && bytesRec > 0);

                            if (totalBytesRec != len)
                                throw new Exception("The total bytes recieved from manager did not equal the expected bytes");
                        }
                        else
                            throw new Exception("Unable to get the response size from the manager");


                        Console.WriteLine("Received {0} bytes.", totalBytesRec);
                    }

                }
                catch (SocketException ex)
                {
                    Console.WriteLine("{0} Error code: {1}.", ex.Message, ex.ErrorCode);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
                finally
                {
                    sock.Shutdown(SocketShutdown.Both);
                    sock.Close();
                }
            }
        }


        private void parsingMsg(string msg)
        {


            if (msg.Length > 0)
            {
                char[] delimiterChars = { '\r', '\n' };
                string[] s = msg.Split(delimiterChars);
                for (int i = 0; i <= s.Length - 1; i++)
                {
                    if (s[i].Length > 2)
                    {
                        string sData = s[i].Substring(2, s[i].Length - 2);
                        switch (s[i].Substring(0, 2))
                        {

                            case "MC":
                                //ret.MC.name = "MC";
                                MC.Name = sData;
                                break;
                            case "VR":
                                VR.Name = sData;
                                break;
                            case "MN":
                                MN.Name = sData;
                                break;
                            case "ST":
                                ST.Name = sData;
                                break;
                            /* case "IM":
                                 ret.IM.name = "IM";
                                 ret.IM.data = sData;
                                 break;
                             case "OP":
                                 ret.OP.name = "OP";
                                 ret.OP.data = sData;
                                 break;
                             case "DD":
                                 ret.DD.name = "DD";
                                 ret.DD.data = sData;
                                 break;
                             case "CP":
                                 ret.CP.name = "CP";
                                 ret.CP.data = sData;
                                 break;
                             case "PO":
                                 ret.PO.name = "PO";
                                 ret.PO.data = sData;
                                 break;
                             case "DG":
                                 ret.DG.name = "DG";
                                 ret.DG.data = sData;
                                 break;
                             case "KA":
                                 ret.KA.name = "KA";
                                 ret.KA.data = sData;
                                 break;
                             case "KI":
                                 ret.KI.name = "KI";
                                 ret.KI.data = sData;
                                 break;
                             case "KE":
                                 ret.KE.name = "KE";
                                 ret.KE.data = sData;
                                 break;
                             case "RI":
                                 ret.RI.name = "RI";
                                 ret.RI.data = sData;
                                 break;
                             case "LI":
                                 ret.LI.name = "LI";
                                 ret.LI.data = sData;
                                 break;
                             case "SM":
                                 ret.SM.name = "SM";
                                 ret.SM.data = sData;
                                 break;
                             case "GW":
                                 ret.GW.name = "GW";
                                 ret.GW.data = sData;
                                 break;
                             case "DS":
                                 ret.DS.name = "DS";
                                 ret.DS.data = sData;
                                 break;
                             case "PI":
                                 ret.PI.name = "PI";
                                 ret.PI.data = sData;
                                 break;
                             case "PP":
                                 ret.PP.name = "PP";
                                 ret.PP.data = sData;
                                 break;
                             case "DP":
                                 ret.DP.name = "DP";
                                 ret.DP.data = sData;
                                 break;
                             case "DI":
                                 ret.DI.name = "DI";
                                 ret.DI.data = sData;
                                 break;
                             case "DW":
                                 ret.DW.name = "DW";
                                 ret.DW.data = sData;
                                 break;
                             case "DH":
                                 ret.DH.name = "DH";
                                 string help = "";
                                 help = sData.Replace("WIZ", "TCP");
                                 ret.DH.data = help;
                                 break;
                             case "LP":
                                 ret.LP.name = "LP";
                                 ret.LP.data = sData;
                                 break;
                             case "RP":
                                 ret.RP.name = "RP";
                                 ret.RP.data = sData;
                                 break;
                             case "RH":
                                 ret.RH.name = "RH";
                                 ret.RH.data = sData;
                                 break;
                             case "BR":
                                 ret.BR.name = "BR";
                                 ret.BR.data = sData;
                                 break;
                             case "DB":
                                 ret.DB.name = "DB";
                                 ret.DB.data = sData;
                                 break;
                             case "PR":
                                 ret.PR.name = "PR";
                                 ret.PR.data = sData;
                                 break;
                             case "SB":
                                 ret.SB.name = "SB";
                                 ret.SB.data = sData;
                                 break;
                             case "FL":
                                 ret.FL.name = "FL";
                                 ret.FL.data = sData;
                                 break;
                             case "IT":
                                 ret.IT.name = "IT";
                                 ret.IT.data = sData;
                                 break;
                             case "PT":
                                 ret.PT.name = "PT";
                                 ret.PT.data = sData;
                                 break;
                             case "PS":
                                 ret.PS.name = "PS";
                                 ret.PS.data = sData;
                                 break;
                             case "PD":
                                 ret.PD.name = "PD";
                                 ret.PD.data = sData;
                                 break;
                             case "TE":
                                 ret.TE.name = "TE";
                                 ret.TE.data = sData;
                                 break;
                             case "SS":
                                 ret.SS.name = "SS";
                                 ret.SS.data = sData;
                                 break;
                             case "NP":
                                 ret.NP.name = "NP";
                                 ret.NP.data = sData;
                                 break;
                             case "SP":
                                 ret.SP.name = "SP";
                                 ret.SP.data = sData;
                                 break;
                             case "LG":
                                 ret.LG.name = "LG";
                                 ret.LG.data = sData;
                                 break;
                             case "ER":
                                 ret.ER.name = "ER";
                                 ret.ER.data = sData;
                                 break;
                             case "UN":
                                 ret.UN.name = "UN";
                                 ret.UN.data = sData;
                                 
                                 break;*/
                        }
                    }
                }
            }
            //return ret;
            listView1.Items.Add(new ListViewItem(new string[] { MC.Name, VR.Name, MN.Name }));
        }




        //Button 1 geklickt
        private void button1_Click(object sender, EventArgs e)
        {



            Start();

            //Send(textBox1.Text);

            //Send(SearchMSG08());
            Sendbyte(SearchMSG08Byte(""));

            //Thread.Sleep(10);
            //Stop();


        }

        private void button2_Click(object sender, EventArgs e)
        {

            TCP08CON(textBox1.Text);


        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

    }
}