Create CustomNetworkManager which prevents client from marking itself as ready until the Loaded finishes

Assets/Scripts/Networking/CustomNetworkManager.cs

@@ -0,0 +1,74 @@
+using System.Collections.Generic;
+using UnityEngine;
+using Mirror;
+using SanAndreasUnity.Utilities;
+using SanAndreasUnity.Behaviours;
+
+namespace SanAndreasUnity.Net
+{
+
+    public class CustomNetworkManager : NetworkManager
+    {
+
+        public override void OnClientConnect(NetworkConnection conn)
+        {
+            if (NetStatus.IsServer)
+            {
+                // just do default action
+                base.OnClientConnect(conn);
+                return;
+            }
+
+            // default method: if no scene was loaded, do Ready/AddPlayer
+
+            // we won't do this until loading process finishes
+
+            if (Loader.HasLoaded)
+                base.OnClientConnect(conn);
+        }
+
+        public override void OnClientSceneChanged(NetworkConnection conn)
+        {
+            if (NetStatus.IsServer)
+            {
+                // just do default action
+                base.OnClientSceneChanged(conn);
+                return;
+            }
+
+            // default method: do Ready/AddPlayer
+
+            // we won't do this until loading process finishes
+
+            if (Loader.HasLoaded)
+                base.OnClientSceneChanged(conn);
+        }
+
+        void OnLoaderFinished()
+        {
+            if (NetStatus.IsServer) // don't do anything on server
+                return;
+
+            if (!NetworkClient.isConnected)
+            {
+                // client is not connected ? hmm... then loading process could not have started
+                Debug.LogErrorFormat("Loader finished, but client is not connected");
+                return;
+            }
+
+            // make client ready
+            if (ClientScene.ready)
+                Debug.LogErrorFormat("Client was made ready before loader finished");
+            else
+                ClientScene.Ready(NetworkClient.connection);
+
+            // add player if specified
+            if (autoCreatePlayer && ClientScene.localPlayer == null)
+            {
+                ClientScene.AddPlayer();
+            }
+        }
+
+    }
+
+}

Assets/Scripts/Networking/CustomNetworkManager.cs.meta

@@ -0,0 +1,11 @@
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Docs/Multiplayer.md

@@ -8,8 +8,6 @@
 
 - send input to server
 
-- make console available in main menu
-
 - client must not be marked as ready, until Loader finishes