Display the server version on disconnect

Author: Zetrith

Languages/English/Keyed/Multiplayer.xml

@@ -11,7 +11,7 @@
   <MpInvalidGameName>Invalid game name</MpInvalidGameName>
 
   <MpWrongProtocol>Wrong protocol version</MpWrongProtocol>
-  <MpWrongModVersionInfo>Make sure you are using the same Multiplayer version as the host.</MpWrongModVersionInfo>
+  <MpWrongMultiplayerVersionInfo>The server is hosted on Multiplayer {0} (protocol {1}).</MpWrongMultiplayerVersionInfo>
 
   <MpWrongDefs>Mod definition mismatch</MpWrongDefs>
   <MpWrongDefsInfo>Make sure your installed mods, their versions and order match the host's.</MpWrongDefsInfo>

Source/Client/MultiplayerSession.cs

@@ -16,6 +16,7 @@
 
 namespace Multiplayer.Client
 {
+    [HotSwappable]
     public class MultiplayerSession : IConnectionStatusListener
     {
         public string gameName;
@@ -123,7 +124,16 @@ public void HandleDisconnectReason(MpDisconnectReason reason, byte[] data)
 
             if (reason == MpDisconnectReason.Generic) reasonKey = reader.ReadString();
 
-            if (reason == MpDisconnectReason.Protocol) { reasonKey = "MpWrongProtocol"; descKey = "MpWrongModVersionInfo"; }
+            if (reason == MpDisconnectReason.Protocol)
+            {
+                reasonKey = "MpWrongProtocol";
+
+                string strVersion = data.Length != 0 ? reader.ReadString() : "0.4.2";
+                int proto = data.Length != 0 ? reader.ReadInt32() : 11;
+
+                disconnectInfo = "MpWrongMultiplayerVersionInfo".Translate(strVersion, proto);
+            }
+
             if (reason == MpDisconnectReason.UsernameLength) { reasonKey = "MpInvalidUsernameLength"; descKey = "MpChangeUsernameInfo"; }
             if (reason == MpDisconnectReason.UsernameChars) { reasonKey = "MpInvalidUsernameChars"; descKey = "MpChangeUsernameInfo"; }
             if (reason == MpDisconnectReason.UsernameAlreadyOnline) { reasonKey = "MpInvalidUsernameAlreadyPlaying"; descKey = "MpChangeUsernameInfo"; }
@@ -139,7 +149,7 @@ public void HandleDisconnectReason(MpDisconnectReason reason, byte[] data)
 
             disconnectReason = reason;
             disconnectReasonKey = reasonKey?.Translate();
-            disconnectInfo = descKey?.Translate();
+            disconnectInfo = disconnectInfo ?? descKey?.Translate();
         }
 
         public void Connected()

Source/Common/ServerConnection.cs

@@ -19,7 +19,7 @@ public void HandleProtocol(ByteReader data)
             int clientProtocol = data.ReadInt32();
             if (clientProtocol != MpVersion.Protocol)
             {
-                Player.Disconnect(MpDisconnectReason.Protocol);
+                Player.Disconnect(MpDisconnectReason.Protocol, ByteWriter.GetBytes(MpVersion.Version, MpVersion.Protocol));
                 return;
             }