Add UDP service discovery

Assets/Scenes/WebView.unity

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Assets/Scripts/EndpointLoader.cs

@@ -11,7 +11,7 @@ public class EndpointLoader : MonoBehaviour
     public WebView webView1;
     public WebView webView2;
 
-    private const string apiUrl = "http://windows.local:5000/api/endpoints";
+    private string apiUrl = "http://windows.local:5000/api/endpoints";
     private const string defaultEndpoint1 = "http://windows.local:8100/mystream/";
     private const string defaultEndpoint2 = "http://windows.local:8200/mystream/";
 
@@ -64,6 +64,15 @@ public class EndpointLoader : MonoBehaviour
         webView2.Load(defaultEndpoint2);
     }
 
+    public void UpdateApiUrl(string newApiUrl)
+    {
+        if (!string.IsNullOrEmpty(newApiUrl))
+        {
+            Debug.Log($"Updating API URL to {newApiUrl}");
+            apiUrl = newApiUrl;
+        }
+    }
+
     [Serializable]
     public class Endpoint
     {

Assets/Scripts/ServiceDiscovery.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading.Tasks;
+using UnityEngine;
+
+public class ServiceDiscovery : MonoBehaviour
+{
+    public EndpointLoader endpointLoader;
+
+    private UdpClient udpClient;
+    private const int multicastPort = 5353;
+    private const string multicastAddress = "224.0.0.251";
+
+    private void Start()
+    {
+        // StartListening();
+    }
+
+    private void StartListening()
+    {
+        try
+        {
+            udpClient = new UdpClient();
+            udpClient.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
+            udpClient.Client.Bind(new IPEndPoint(IPAddress.Any, multicastPort));
+            udpClient.JoinMulticastGroup(IPAddress.Parse(multicastAddress));
+
+            Debug.Log("Listening for service announcements...");
+
+            udpClient.BeginReceive(OnReceive, null);
+        }
+        catch (Exception ex)
+        {
+            Debug.LogError($"Error starting UDP listener: {ex.Message}");
+        }
+    }
+
+    private void OnReceive(IAsyncResult result)
+    {
+        try
+        {
+            IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, multicastPort);
+            byte[] receivedBytes = udpClient.EndReceive(result, ref remoteEndPoint);
+            string receivedMessage = Encoding.UTF8.GetString(receivedBytes);
+
+            Debug.Log($"Received message: {receivedMessage} from {remoteEndPoint}");
+
+            string[] parts = receivedMessage.Split(':');
+            if (parts.Length == 3 && IPAddress.TryParse(parts[1], out IPAddress ip))
+            {
+                int port = int.Parse(parts[2]);
+                ConnectToService(ip.ToString(), port);
+            }
+
+            // udpClient.BeginReceive(OnReceive, null);
+        }
+        catch (Exception ex)
+        {
+            Debug.LogError($"Error receiving UDP message: {ex.Message}");
+        }
+    }
+
+    private void ConnectToService(string ipAddress, int port)
+    {
+        Debug.Log($"Connecting to service at {ipAddress}:{port}");
+        endpointLoader.UpdateApiUrl($"http://{ipAddress}:{port}/api/endpoints");
+    }
+
+    private void OnApplicationQuit()
+    {
+        udpClient?.DropMulticastGroup(IPAddress.Parse(multicastAddress));
+        udpClient?.Close();
+    }
+}
+

Assets/Scripts/ServiceDiscovery.cs.meta

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