WIP ws messages, TODO backend receiving frontend messages

frontend/lib/features/room/game_room.dart

@@ -5,6 +5,7 @@ import 'package:frontend/providers/game_messages.dart';
 import 'package:frontend/providers/web_socket.dart';
 import 'package:go_router/go_router.dart';
 import 'package:logging/logging.dart';
+import 'package:shared_models/room.dart';
 
 final logger = Logger('GameRoomHome');
 
@@ -30,17 +31,33 @@ class _GameRoomHomeState extends ConsumerState<GameRoomHome> {
     if (jwt == null || jwt.roomUuid != widget.roomUuid) {
       logger.fine('Tried to open room, but not authenticated / wrong room');
       // return home
-      context.go('/');
+      WidgetsBinding.instance.addPostFrameCallback((_) => context.go('/'));
     }
 
     final connection = ref.watch(webSocketNotifierProvider).valueOrNull;
 
-    ref.listen(
-      gameMessageNotifierProvider,
-      (previous, next) {
-        print('Got message: $next');
-      },
-    );
+    if (jwt != null) {
+      ref.listen(
+        gameMessageNotifierProvider,
+        (previous, next) {
+          final message = next.valueOrNull;
+          if (message is GameRoomMessage) {
+            switch (message) {
+              case PingMessage():
+                final ping = PingMessage.now(
+                  jwt.roomUuid,
+                  dest: PingDestination.server,
+                  userUuid: jwt.uuid,
+                );
+                ref.read(webSocketNotifierProvider.notifier).sendMessage(ping);
+              case PlayerVoteMessage():
+                // TODO: Handle this case.
+                throw UnimplementedError();
+            }
+          }
+        },
+      );
+    }
     // enstablish ws connection at /room/roomCode/ws and save to gameMessageProvider
     return Scaffold(
       body: Column(