ngFor approach works, non-local mqtt broker doesn't work so far

src/app/app.component.ts

@@ -1,10 +1,72 @@
-import { Component } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
+import { MqttclientService } from './mqttclient.service'
 
 @Component({
   selector: 'app-root',
   templateUrl: './app.component.html',
   styleUrls: ['./app.component.css']
 })
-export class AppComponent {
+export class AppComponent implements OnInit {
   title = 'app';
+  private topic : string = 'smartclient/configuration'
+  configuration : any = {
+    'switches': [
+      { 
+        'room': 'Wohnzimmer', 
+        'switches': [
+          {
+            'label': 'kleine Lampe',
+            'topic': 'dispatcher_ng/items/Gnd/LivingRoom/SmallLight'
+          },
+          {
+            'label': 'große Lampe',
+            'topic': 'dispatcher_ng/items/Gnd/LivingRoom/LargeLight'
+          },
+          {
+            'label': 'Sterne',
+            'topic': 'dispatcher_ng/items/Gnd/LivingRoom/Stars'
+          },
+          {
+            'label': 'Stehlampe',
+            'topic': 'dispatcher_ng/items/Gnd/LivingRoom/StandLight'
+          }
+        ]
+      },
+      {
+        'room': 'Esszimmer',
+        'switches': [
+          {
+            'label': 'kleine Lampe',
+            'topic': 'dispatcher_ng/items/Gnd/DiningRoom/SmallLight'
+          },
+          {
+            'label': 'Stehlampe',
+            'topic': 'dispatcher_ng/items/Gnd/DiningRoom/StandLight'
+          },
+          {
+            'label': 'Schranklicht',
+            'topic': 'dispatcher_ng/items/Gnd/DiningRoom/CupboardLight'
+          },
+          {
+            'label': 'Naehkaestchenlicht',
+            'topic': 'dispatcher_ng/items/Gnd/DiningRoom/NaehkaestchenLight'
+          },
+          {
+            'label': 'Regallicht',
+            'topic': 'dispatcher_ng/items/Gnd/DiningRoom/ShelfLight'
+          }
+        ]
+      }
+    ]
+
+  }
+
+  constructor(private mqttclientService : MqttclientService) { 
+  }
+
+  ngOnInit() {
+    this.mqttclientService.register(this.topic, (message: string) => {
+    })
+  }
+
 }