inital

lib/screens/viewer_screen.dart

@@ -92,7 +92,10 @@ class _ViewerScreenState extends State<ViewerScreen> {
       return;
     }
 
-    _sig.send({'type': 'join', 'roomId': roomId});
+    // build the peer connection BEFORE telling the server we've joined,
+    // otherwise the host's offer can race in before _pc exists and the
+    // whole answer step gets silently dropped
+    await _initPeerConnection(roomId);
 
     _sigSub = _sig.messages.listen(
       (msg) => _onSignal(msg, roomId),
@@ -100,6 +103,8 @@ class _ViewerScreenState extends State<ViewerScreen> {
         setState(() => _status = 'Signal error: $e');
       },
     );
+
+    _sig.send({'type': 'join', 'roomId': roomId});
   }
 
   Future<void> _onSignal(Map<String, dynamic> msg, String roomId) async {
@@ -108,7 +113,6 @@ class _ViewerScreenState extends State<ViewerScreen> {
     switch (type) {
       case 'joined':
         setState(() => _status = 'Waiting for host offer...');
-        await _initPeerConnection(roomId);
         break;
 
       case 'signal':