Basic implementation of match comms

RLBotCS/Server/FlatBuffersSession.cs

@@ -23,6 +23,8 @@ public record RendersAllowed(bool Allowed) : SessionMessage;
 
     public record StateSettingAllowed(bool Allowed) : SessionMessage;
 
+    public record MatchComm(MatchCommT matchComm) : SessionMessage;
+
     public record StopMatch : SessionMessage;
 }
 
@@ -120,7 +122,7 @@ private async Task<bool> ParseClientMessage(TypedPayload message)
                     break;
 
                 var matchComms = MatchComm.GetRootAsMatchComm(byteBuffer).UnPack();
-                // todo: send to server to send to other clients
+                await _rlbotServer.WriteAsync(new SendMatchComm(_clientId, matchComms));
 
                 break;
 
@@ -209,6 +211,15 @@ await SendPayloadToClientAsync(
                     break;
                 case SessionMessage.StateSettingAllowed m:
                     _stateSettingIsEnabled = m.Allowed;
+                    break;
+                case SessionMessage.MatchComm m when _isReady && _wantsComms:
+                    _messageBuilder.Clear();
+                    _messageBuilder.Finish(MatchComm.Pack(_messageBuilder, m.matchComm).Value);
+
+                    await SendPayloadToClientAsync(
+                        TypedPayload.FromFlatBufferBuilder(DataType.MatchComms, _messageBuilder)
+                    );
+
                     break;
                 case SessionMessage.StopMatch when _isReady && _closeAfterMatch:
                     Console.WriteLine("Core got stop match message from server.");

RLBotCS/Server/FlatbuffersMessage/SendMatchComm.cs

@@ -0,0 +1,25 @@
+using rlbot.flat;
+
+namespace RLBotCS.Server.FlatbuffersMessage;
+
+internal record SendMatchComm(int ClientId, MatchCommT MatchComm) : IServerMessage
+{
+    public ServerAction Execute(ServerContext context)
+    {
+        var message = new SessionMessage.MatchComm(MatchComm);
+
+        foreach (var session in context.Sessions)
+        {
+            var id = session.Key;
+            var writer = session.Value;
+
+            // Don't send the message back to the client that sent it.
+            if (id != ClientId)
+            {
+                writer.writer.TryWrite(message);
+            }
+        }
+
+        return ServerAction.Continue;
+    }
+}