C#でUDPデータ受信

受信側サンプルコード

// 基本
var receiveIpAddress = "127.0.0.1";
var local = new IPEndPoint(IPAddress.Parse(receiveIpAddress), Port);
var remote = new IPEndPoint(IPAddress.Any, 8006) as EndPoint;
socket.Bind(local);
var buffer = new byte[3];

while (true)
{
    Console.WriteLine("Start Receiving");

    // var length = socket.ReceiveFrom(buffer, ref remote);
    var length = socket.Receive(buffer);
    var requiredBuffer = new byte[length];
    Buffer.BlockCopy(buffer, 0, requiredBuffer, 0, length);
    
    var data = Encoding.UTF8.GetString(requiredBuffer);
    Console.WriteLine("data received: " + data);
}

受信側コードの注意点

bufferの配列サイズがdatagramサイズより小さいと、下記のようなエラーが出る

System.Net.Sockets.SocketException (10040): A message sent on a datagram socket was larger than the internal message buffer or some other network limit, or the buffer used to receive a datagram into was smaller than the datagram itself.