Refactoring

lib/content_views/messages_page.dart

@@ -10,6 +10,9 @@ import 'package:stadtbote/main.dart';
 import 'package:stadtbote/model/message.dart' as sbmessage;
 import 'package:stadtbote/model/message.dart';
 import 'package:stadtbote/model/session_status.dart';
+import 'package:stadtbote/tools/constants.dart';
+import 'package:stadtbote/tools/message_service.dart';
+import 'package:stadtbote/tools/messages/PublishPayloadMessage.dart';
 import 'package:stadtbote/tools/mqtt_core.dart';
 
 import '../tools/util.dart';
@@ -108,7 +111,7 @@ class _MessagesPageState extends State<MessagesPage> {
       await MyApp.isarInstance.messages.put(message);
     });
 
-    MqttCore.instance.publishMessage('message', jsonEncode(message.toJson()));
+    MessageService().publish<PublishPayloadMessage>(Constants.messageTopicPublishPayload, arguments: PublishPayloadMessage(topic: "message", message: message.toJson()));
 
     _messages.insert(0, types.TextMessage(
       author: _user,