Styjun

I have set up a UDP client to receive data in C#. The client is set to receive using the assigned IP address from my WiFi router. The client can receive data if I run the program on the same computer as the sender. But when I try the receive client on a different computer, the client does not receive any data.

I have tried setting the IP address in the UDP client to IPAddress.Any, this did not work. I've tried other ports and this also did not work.

The IP address on the receive side is set to the IP address of the sender. The sender IP address is set to the receiver address. The port numbers are the same.

The important part of the code starts at Private Void Receive().

using UnityEngine;
using System.Collections;

using System;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;

public class UDPReceive : MonoBehaviour


 // receiving Thread
 Thread receiveThread;

 // udpclient object
 UdpClient client;

 //public string IP = "192.168.0.1";
 public int port; // define > init

 IPAddress ipaddress = IPAddress.Parse("192.168.0.100");

 // infos
 public string lastReceivedUDPPacket = "";
 public string allReceivedUDPPackets = ""; // clean up this from time to time!


 // start from shell
 private static void Main()
 
 UDPReceive receiveObj = new UDPReceive();
 receiveObj.init();

 string text = "";
 do
 
 text = Console.ReadLine();
 
 while (!text.Equals("exit"));
 
 // start from unity3d
 public void Start()
 

 init();
 


 // init
 private void init()
 
 print("UDPSend.init()");

 // define port
 port = 27015;

 // status
 print("Sending to 192.168.0.100 : " + port);
 print("Test-Sending to this Port: nc -u 192.168.0.100 " + port + "");

 receiveThread = new Thread(
 new ThreadStart(ReceiveData));
 receiveThread.IsBackground = true;
 receiveThread.Start();

 

 // receive thread
 private void ReceiveData()
 

 client = new UdpClient(port);
 while (true)
 

 try
 

 IPEndPoint anyIP = new IPEndPoint(ipaddress, port);
 byte[] data = client.Receive(ref anyIP);

 string text = Encoding.UTF8.GetString(data);

 print(">> " + text);

 // latest UDPpacket
 lastReceivedUDPPacket = text;

 // ....
 allReceivedUDPPackets = allReceivedUDPPackets + text;

 
 catch (Exception err)
 
 print(err.ToString());
 
 
 

 private void OnDisable()
 
 if (receiveThread != null)
 
 receiveThread.Abort();
 client.Close();
 
 

 // getLatestUDPPacket
 // cleans up the rest
 public string getLatestUDPPacket()
 
 allReceivedUDPPackets = "";
 return lastReceivedUDPPacket;
 

I set the client IP address to 192.168.0.100 which is the IP address of the sender.

When I run the program on my computer, the client receives. It does not receive on other computers.

I have also tried setting the client IP address to its local IP address, and that also does not work.

It seems that the client can only receive via local host.

Is there something that I'm missing? I've even tried opening the firewall to allow data on port 27015. Also did not work.