UDPPacketIO.cs

using System;
using System.IO;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using UnityEngine;

/// <summary>
/// UdpPacket provides packetIO over UDP
/// </summary>
public class UDPPacketIO : MonoBehaviour
{

    void Start()
    {
        //do nothing. init must be called  	
    }

    public void GetIP()
    {
        IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, 0);

        string senderIPAddress = remoteEndPoint.Address.ToString();
        Debug.Log("ip = " + senderIPAddress);
    }

    public void Init(string hostIP, int remotePort, int localPort)
    {
        Debug.Log("a");
        RemoteHostName = hostIP;
        RemotePort = remotePort;
        LocalPort = localPort;
        socketsOpen = false;

    }


    //    public UdpPacket()
    //    {
    //   }

    ~UDPPacketIO()
    {
        if (IsOpen())
            Close();
    }

    /// <summary>
    /// Open a UDP socket and create a UDP sender.
    /// 
    /// The default values with which a UdpPacket is created are:
    /// - Address of the board to send to - 192.168.0.200
    /// - Remote port to send to - 10000
    /// - Local port to listen on - 10000
    /// </summary>
    /// <returns>True on success, false on failure.</returns>
    public bool Open()
    {
        try
        {
            Sender = new UdpClient();
            Receiver = new UdpClient(localPort);
            socketsOpen = true;
            return true;
        }
        catch
        {
        }
        return false;
    }

    /// <summary>
    /// Close the socket currently listening, and destroy the UDP sender device.
    /// </summary>
    public void Close()
    {
        if (Sender != null)
            Sender.Close();
        if (Receiver != null)
            Receiver.Close();
        socketsOpen = false;
    }

    /// <summary>
    /// Query the open state of the UDP socket.
    /// </summary>
    /// <returns>True if open, false if closed.</returns>
    public bool IsOpen()
    {
        return socketsOpen;
    }

    /// <summary>
    /// Send a packet of bytes out via UDP.
    /// </summary>
    /// <param name="packet">The packet of bytes to be sent.</param>
    /// <param name="length">The length of the packet of bytes to be sent.</param>
    public void SendPacket(byte[] packet, int length)
    {
        if (!IsOpen())
            Open();
        if (!IsOpen())
            return;

        Sender.Send(packet, length, remoteHostName, remotePort);
    }

    /// <summary>
    /// Receive a packet of bytes over UDP.
    /// </summary>
    /// <param name="buffer">The buffer to be read into.</param>
    /// <returns>The number of bytes read, or 0 on failure.</returns>
    public int ReceivePacket(byte[] buffer, out string senderIPAddress)
    {
        senderIPAddress = "";
        if (!IsOpen())
            Open();
        if (!IsOpen())
            return 0;

        IPEndPoint iep = new IPEndPoint(IPAddress.Any, 0);
        byte[] incoming = Receiver.Receive(ref iep);
        int count = Math.Min(buffer.Length, incoming.Length);
        System.Array.Copy(incoming, buffer, count);

        senderIPAddress = iep.Address.ToString();
        return count;
    }

    private UdpClient Sender;
    private UdpClient Receiver;
    private bool socketsOpen;
    private string remoteHostName;
    private int remotePort;
    private int localPort;

    /// <summary>
    /// The address of the board that you're sending to.
    /// </summary>
    public string RemoteHostName
    {
        get
        {
            return remoteHostName;
        }
        set
        {
            remoteHostName = value;
        }
    }

    /// <summary>
    /// The remote port that you're sending to.
    /// </summary>
    public int RemotePort
    {
        get
        {
            return remotePort;
        }
        set
        {
            remotePort = value;
        }
    }

    /// <summary>
    /// The local port you're listening on.
    /// </summary>
    public int LocalPort
    {
        get
        {
            return localPort;
        }
        set
        {
            localPort = value;
        }
    }
}