Added LegacyChannel to config

Author: TwoTenPvP

MLAPI/Data/NetworkingConfiguration.cs

@@ -32,6 +32,7 @@ public class NetworkingConfiguration
         public bool EncryptMessages = false;
         public bool AllowPassthroughMessages = true;
         public bool EnableSceneSwitching = false;
+        public bool UseLegacyChannel = false;
 
         //Cached config hash
         private byte[] ConfigHash = null;

MLAPI/MonoBehaviours/Core/NetworkingManager.cs

@@ -106,7 +106,13 @@ private ConnectionConfig Init(NetworkingConfiguration netConfig)
             ConnectionConfig cConfig = new ConnectionConfig();
 
             //MLAPI channels and messageTypes
-            NetworkConfig.Channels.Add("MLAPI_RELIABLE_FRAGMENTED_SEQUENCED", QosType.ReliableFragmentedSequenced);
+
+            //Legacy channel. ReliableFragmentedSequenced doesn't exist in older Unity versions.
+            if(NetworkConfig.UseLegacyChannel)
+                NetworkConfig.Channels.Add("MLAPI_RELIABLE_FRAGMENTED_SEQUENCED", QosType.ReliableSequenced);
+            else
+                NetworkConfig.Channels.Add("MLAPI_RELIABLE_FRAGMENTED_SEQUENCED", QosType.ReliableFragmentedSequenced);
+
             NetworkConfig.Channels.Add("MLAPI_POSITION_UPDATE", QosType.StateUpdate);
             NetworkConfig.Channels.Add("MLAPI_ANIMATION_UPDATE", QosType.ReliableSequenced);
             MessageManager.messageTypes.Add("MLAPI_CONNECTION_REQUEST", 0);