fix(NetworkDiscoveryHUD): More robust OnValidate / Reset

Handler would not be added if component ref not null.

Assets/Mirror/Components/Discovery/NetworkDiscoveryBase.cs

@@ -170,6 +170,8 @@ public void AdvertiseServer()
                 MulticastLoopback = false
             };
 
+            //Debug.Log($"Discovery: Advertising Server {Dns.GetHostName()}");
+
             // listen for client pings
             _ = ServerListenAsync();
         }
@@ -418,6 +420,7 @@ public void BroadcastDiscoveryRequest()
 
                     ArraySegment<byte> data = writer.ToArraySegment();
 
+                    //Debug.Log($"Discovery: Sending BroadcastDiscoveryRequest {request}");
                     clientUdpClient.SendAsync(data.Array, data.Count, endPoint);
                 }
                 catch (Exception)

Assets/Mirror/Components/Discovery/NetworkDiscoveryHUD.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 using UnityEngine;
 
 namespace Mirror.Discovery
@@ -17,11 +18,20 @@ public class NetworkDiscoveryHUD : MonoBehaviour
 #if UNITY_EDITOR
         void OnValidate()
         {
-            if (networkDiscovery == null)
+            if (Application.isPlaying) return;
+            Reset();
+        }
+
+        void Reset()
         {
             networkDiscovery = GetComponent<NetworkDiscovery>();
+
+            // Add default event handler if not already present
+            if (!Enumerable.Range(0, networkDiscovery.OnServerFound.GetPersistentEventCount())
+                .Any(i => networkDiscovery.OnServerFound.GetPersistentMethodName(i) == "OnDiscoveredServer"))
+            {
                 UnityEditor.Events.UnityEventTools.AddPersistentListener(networkDiscovery.OnServerFound, OnDiscoveredServer);
-                UnityEditor.Undo.RecordObjects(new Object[] { this, networkDiscovery }, "Set NetworkDiscovery");
+                UnityEditor.Undo.RecordObjects(new UnityEngine.Object[] { this, networkDiscovery }, "Set NetworkDiscovery");
             }
         }
 #endif
@@ -125,6 +135,8 @@ void Connect(ServerResponse info)
 
         public void OnDiscoveredServer(ServerResponse info)
         {
+            Debug.Log($"Discovered Server: {info.serverId} | {info.EndPoint} | {info.uri}");
+
             // Note that you can check the versioning to decide if you can connect to the server or not using this method
             discoveredServers[info.serverId] = info;
         }

Assets/Mirror/Examples/Discovery/Scenes/MirrorDiscovery.unity

@@ -43,7 +43,7 @@ RenderSettings:
 --- !u!157 &3
 LightmapSettings:
   m_ObjectHideFlags: 0
-  serializedVersion: 11
+  serializedVersion: 12
   m_GIWorkflowMode: 0
   m_GISettings:
     serializedVersion: 2
@@ -98,7 +98,6 @@ LightmapSettings:
     m_TrainingDataDestination: TrainingData
     m_LightProbeSampleCountMultiplier: 4
   m_LightingDataAsset: {fileID: 0}
-  m_UseShadowmask: 1
 --- !u!196 &4
 NavMeshSettings:
   serializedVersion: 2
@@ -118,6 +117,8 @@ NavMeshSettings:
     manualTileSize: 0
     tileSize: 256
     accuratePlacement: 0
+    maxJobWorkers: 0
+    preserveTilesOutsideBounds: 0
     debug:
       m_Flags: 0
   m_NavMeshData: {fileID: 0}
@@ -433,8 +434,6 @@ MonoBehaviour:
   headlessStartMode: 1
   editorAutoStart: 0
   sendRate: 30
-  autoStartServerBuild: 0
-  autoConnectClientBuild: 0
   offlineScene: 
   onlineScene: 
   offlineSceneLoadDelay: 0
@@ -444,8 +443,7 @@ MonoBehaviour:
   disconnectInactiveConnections: 0
   disconnectInactiveTimeout: 60
   authenticator: {fileID: 0}
-  playerPrefab: {fileID: 9081919128954505657, guid: ecd52c53a6ef7496693343d3e32dace1,
-    type: 3}
+  playerPrefab: {fileID: 9081919128954505657, guid: ecd52c53a6ef7496693343d3e32dace1, type: 3}
   autoCreatePlayer: 1
   playerSpawnMethod: 0
   spawnPrefabs: []
@@ -508,6 +506,21 @@ MonoBehaviour:
   serverBroadcastListenPort: 47777
   ActiveDiscoveryInterval: 3
   transport: {fileID: 1556883244}
+  OnServerFound:
+    m_PersistentCalls:
+      m_Calls:
+      - m_Target: {fileID: 1556883246}
+        m_TargetAssemblyTypeName: Mirror.Discovery.NetworkDiscoveryHUD, Mirror.Components
+        m_MethodName: OnDiscoveredServer
+        m_Mode: 0
+        m_Arguments:
+          m_ObjectArgument: {fileID: 0}
+          m_ObjectArgumentAssemblyTypeName: 
+          m_IntArgument: 0
+          m_FloatArgument: 0
+          m_StringArgument: 
+          m_BoolArgument: 0
+        m_CallState: 2
   secretHandshake: 1558261479176021378
 --- !u!1 &1611696151
 GameObject:
@@ -628,6 +641,7 @@ Light:
   m_UseColorTemperature: 0
   m_BoundingSphereOverride: {x: 0, y: 0, z: 0, w: 0}
   m_UseBoundingSphereOverride: 0
+  m_UseViewFrustumForShadowCasterCull: 1
   m_ShadowRadius: 0
   m_ShadowAngle: 0
 --- !u!4 &1730851148