Fix MessageComponent 'next' button

src/app/messages/messages.component.ts

@@ -43,4 +43,8 @@ export class MessagesComponent implements OnInit {
         this.command_handlers[event.data.command](event.data);
       });
   }
+
+  stepFSM() {
+    this.websocketService.sendJSON({key: '', trigger: 'step_next'});
+  }
 }