title: Receiving Notifications/Indications on Ionic 2 Framework (BLE-Plugin)
body: <p>I't trying to received notifications/indications from a connected BLE-Device from Ionic-Application (on Android).
  Reading and writing of Characteristics is working, if I activate notifications they are set on the BLE-Device. It will send data to my application, but I get no data.</p>
  
  <p>If the page is loaded, I check the connection state. If the application is connected, I start notification and write data to the device.</p>
  
  <p>Here is how I activate the notifications.</p>
  
  <pre><code>BLE.startNotification("MAC-Address", "service-UUID", "characteristic-UUID").subscribe(buffer =&gt; {
      this.notificationReceived(buffer);
  });
  BLE.write("MAC-Address", "service-UUID", "characteristic-UUID", start.buffer)
    .then(data =&gt; {
        console.log('prepared for download, wait for response');
    }, error =&gt; {
      console.error('Failed to initialize Data transfer ' + error);
    });
  </code></pre>
  
  <p>The notificationReceived is called once, just before BLE.write. The notifications are enabled on the BLE-Device (I have added some debug-outputs on it). In the debug-outputs of the BLE-Device I can see it will send a notification, but in the Ionic-App I receive nothing.</p>
  
  <p>Anybody a hint for me what I could check? I'm new to TypeScript, so this could be anything, I have no Ideas what I could check next.</p>