Add multicast failover

Assets/Scenes/WebView.unity

@@ -1846,6 +1846,7 @@ MonoBehaviour:
   m_EditorClassIdentifier: 
   webView1: {fileID: 323128546}
   webView2: {fileID: 781542341}
+  serviceDiscovery: {fileID: 1389755618}
 --- !u!1 &504187403
 GameObject:
   m_ObjectHideFlags: 0
@@ -4827,7 +4828,6 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: c3ce81ebd33ef3d46b8bc545525b82fa, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  endpointLoader: {fileID: 491721038}
 --- !u!1 &1517812034
 GameObject:
   m_ObjectHideFlags: 0

Assets/Scripts/EndpointLoader.cs

@@ -10,8 +10,10 @@ public class EndpointLoader : MonoBehaviour
 {
     public WebView webView1;
     public WebView webView2;
+    public ServiceDiscovery serviceDiscovery;
 
-    private string apiUrl = "http://windows.local:5000/api/endpoints";
+    private bool triedMulticast = false;
+    private string apiUrl = "http://windows.loca:5000/api/endpoints";
     private const string defaultEndpoint1 = "http://windows.local:8100/mystream/";
     private const string defaultEndpoint2 = "http://windows.local:8200/mystream/";
 
@@ -30,8 +32,9 @@ public class EndpointLoader : MonoBehaviour
 
         if (request.result == UnityWebRequest.Result.ConnectionError || request.result == UnityWebRequest.Result.ProtocolError)
         {
-            Debug.LogError($"Error loading endpoints: {request.error}. Using default endpoints");
-            UseDefaultEndpoints();
+            Debug.LogWarning($"Error loading endpoints: {request.error}");
+
+            StartListeningForMulticast();
             yield break;
         }
 
@@ -43,8 +46,8 @@ public class EndpointLoader : MonoBehaviour
 
         if (endpoints.Length == 0)
         {
-            Debug.LogError("Parsed endpoints are empty. Using default endpoints");
-            UseDefaultEndpoints();
+            Debug.LogError("Parsed endpoints are empty.");
+            StartListeningForMulticast();
         }
         else
         {
@@ -53,8 +56,28 @@ public class EndpointLoader : MonoBehaviour
         }
     }
 
+    private void StartListeningForMulticast()
+    {
+        if (triedMulticast)
+        {
+            Debug.LogWarning("Multicast also failed. Using default endpoints.");
+            UseDefaultEndpoints();
+            return;
+        }
+
+        Debug.Log("Starting multicast discovery for endpoints");
+
+        triedMulticast = true;
+        serviceDiscovery.StartListening((ipAddress, port) =>
+        {
+            apiUrl = $"http://{ipAddress}:{port}/api/endpoints";
+            StartCoroutine(LoadEndpoints());
+        });
+    }
+
     public void ReloadEndpoints()
     {
+        triedMulticast = false;
         StartCoroutine(LoadEndpoints());
     }
 
@@ -64,15 +87,6 @@ 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

@@ -3,22 +3,22 @@ using System.Net;
 using System.Net.Sockets;
 using System.Text;
 using System.Threading.Tasks;
+using System.Threading;
 using UnityEngine;
 
 public class ServiceDiscovery : MonoBehaviour
 {
-    public EndpointLoader endpointLoader;
-
     private UdpClient udpClient;
-    private const int multicastPort = 5353;
+    private Action<string, string> action;
+
+    private string receivedIp;
+    private string receivedPort;
+    private bool messageReceived = false;
+
     private const string multicastAddress = "224.0.0.251";
+    private const int multicastPort = 5353;
 
-    private void Start()
-    {
-        // StartListening();
-    }
-
-    private void StartListening()
+    public void StartListening(Action<string, string> action)
     {
         try
         {
@@ -27,6 +27,8 @@ public class ServiceDiscovery : MonoBehaviour
             udpClient.Client.Bind(new IPEndPoint(IPAddress.Any, multicastPort));
             udpClient.JoinMulticastGroup(IPAddress.Parse(multicastAddress));
 
+            this.action = action;
+
             Debug.Log("Listening for service announcements...");
 
             udpClient.BeginReceive(OnReceive, null);
@@ -39,6 +41,11 @@ public class ServiceDiscovery : MonoBehaviour
 
     private void OnReceive(IAsyncResult result)
     {
+        if (udpClient == null)
+        {
+            return;
+        }
+
         try
         {
             IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, multicastPort);
@@ -51,10 +58,16 @@ public class ServiceDiscovery : MonoBehaviour
             if (parts.Length == 3 && IPAddress.TryParse(parts[1], out IPAddress ip))
             {
                 int port = int.Parse(parts[2]);
-                ConnectToService(ip.ToString(), port);
-            }
+                receivedIp = ip.ToString();
+                receivedPort = port.ToString();
+                messageReceived = true;
 
-            // udpClient.BeginReceive(OnReceive, null);
+                StopListening();
+            }
+            else
+            {
+                udpClient?.BeginReceive(OnReceive, null);
+            }
         }
         catch (Exception ex)
         {
@@ -62,16 +75,25 @@ public class ServiceDiscovery : MonoBehaviour
         }
     }
 
-    private void ConnectToService(string ipAddress, int port)
+    private void Update()
     {
-        Debug.Log($"Connecting to service at {ipAddress}:{port}");
-        endpointLoader.UpdateApiUrl($"http://{ipAddress}:{port}/api/endpoints");
+        if (messageReceived)
+        {
+            action?.Invoke(receivedIp, receivedPort);
+            messageReceived = false;
+        }
     }
 
     private void OnApplicationQuit()
+    {
+        StopListening();
+    }
+
+    private void StopListening()
     {
         udpClient?.DropMulticastGroup(IPAddress.Parse(multicastAddress));
         udpClient?.Close();
+        udpClient = null;
     }
 }