add kcp

Src/Core/Net/LAN/Core.meta

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Src/Core/Net/LAN/Core/ILANBroadcaster.cs

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+using System;
+using System.Net;
+
+namespace BITKit.Net.LAN
+{
+	public interface ILANBroadcaster
+	{
+		int Port { get; set; }
+        byte[] Buffer { get; set; }
+		event Action<EndPoint, string> OnReceive;
+		void StartBroadcast();
+		void StopBroadcast();
+		void StartListen();
+		void StopListen();
+	}
+}

Src/Core/Net/LAN/Core/ILANBroadcaster.cs.meta

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Src/Core/Net/LAN/UdpBasedLanBroadcaster.cs

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+using System;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading;
+
+namespace BITKit.Net.LAN
+{
+	/// <summary>
+	/// 基于UDP的LAN广播
+	/// </summary>
+	public class UdpBasedLanBroadcaster : ILANBroadcaster
+	{
+		public int Port { get; set; }
+		public byte[] Buffer { get; set; } = StringHelper.GetBytes("Hello World");
+		private bool _isBroadcasting;
+		private bool _isListening;
+
+		public UdpBasedLanBroadcaster()
+		{
+
+		}
+
+		public event Action<EndPoint, string> OnReceive;
+
+		public void StartBroadcast()
+		{
+			_isBroadcasting = true;
+			Thread thread = new(Process)
+			{
+				IsBackground = true
+			};
+			thread.Start();
+			BIT4Log.Log<ILANBroadcaster>($"开始广播端口{Port}");
+		}
+
+		public void StopBroadcast()
+		{
+			_isBroadcasting = false;
+			BIT4Log.Log<ILANBroadcaster>($"停止广播端口 {Port}");
+		}
+
+		public void StartListen()
+		{
+			_isListening = true;
+			var thread = new Thread(ReceiveThread)
+			{
+				IsBackground = true
+			};
+			thread.Start();
+			BIT4Log.Log<ILANBroadcaster>($"开始监听端口:{Port}");
+		}
+
+		public void StopListen()
+		{
+			_isListening = false;
+			BIT4Log.Log<ILANBroadcaster>($"停止监听端口{Port}");
+		}
+
+
+		private void Process()
+		{
+			var udpClient = new UdpClient(new IPEndPoint(IPAddress.Any, 0));
+			
+			var endpoint = new IPEndPoint(IPAddress.Broadcast, Port);
+			//其实 IPAddress.Broadcast 就是 255.255.255.255
+			//下面代码与上面有相同的作用
+			//IPEndPoint endpoint = new IPEndPoint(IPAddress.Parse("255.255.255.255"), 8080);
+			try
+			{
+				while (_isBroadcasting)
+				{
+					udpClient.Send(Buffer, Buffer.Length, endpoint);
+					Thread.Sleep(1000);
+				}
+			}
+			catch (Exception e)
+			{
+				BIT4Log.LogException(e);
+			}
+			udpClient.Dispose();
+		}
+
+		private void ReceiveThread()
+		{
+			try
+			{
+				var udpClient = new UdpClient(new IPEndPoint(IPAddress.Any, Port));
+				var endpoint = new IPEndPoint(IPAddress.Any, 0);
+				while (_isListening)
+				{
+					var buf = udpClient.Receive(ref endpoint);
+					var msg = Encoding.Default.GetString(buf);
+					if (OnReceive is not null)
+						OnReceive(endpoint, msg);
+					else
+						BIT4Log.Log<ILANBroadcaster>($"Receive From {endpoint}:\t{msg}");
+					Thread.Sleep(500);
+				}
+			}
+			catch (Exception e)
+			{
+				BIT4Log.LogException(e);
+			}
+		
+		}
+	}
+}

Src/Core/Net/LAN/UdpBasedLanBroadcaster.cs.meta

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