Implement solution check forwarding

src/app/messages/messages.component.ts

@@ -30,7 +30,7 @@ export class MessagesComponent implements OnInit {
     });
 
     this.websocketService.connect();
-    this.websocketService.observeKey<Message>('message.send').subscribe(
+    this.websocketService.observeControl<Message>('message.send').subscribe(
       message => this.newMessage.next(message)
     );
   }