/// <summary>
        /// Invoked as an event handler when an advertisement is received.
        /// </summary>
        /// <param name="watcher">Instance of watcher that triggered the event.</param>
        /// <param name="eventArgs">Event data containing information about the advertisement event.</param>
        private async void OnAdvertisementReceived(BluetoothLEAdvertisementWatcher watcher, BluetoothLEAdvertisementReceivedEventArgs eventArgs)
        {
            // We can obtain various information about the advertisement we just received by accessing
            // the properties of the EventArgs class

            // The timestamp of the event
            DateTimeOffset timestamp = eventArgs.Timestamp;

            // The type of advertisement
            BluetoothLEAdvertisementType advertisementType = eventArgs.AdvertisementType;

            // The received signal strength indicator (RSSI)
            Int16 rssi = eventArgs.RawSignalStrengthInDBm;

            // The local name of the advertising device contained within the payload, if any
            string localName = eventArgs.Advertisement.LocalName;

            // Check if there are any manufacturer-specific sections.
            // If there is, print the raw data of the first manufacturer section (if there are multiple).
            string manufacturerDataString = "";
            var    manufacturerSections   = eventArgs.Advertisement.ManufacturerData;

            if (manufacturerSections.Count > 0)
            {
                // Only print the first one of the list
                var manufacturerData = manufacturerSections[0];
                var data             = new byte[manufacturerData.Data.Length];
                using (var reader = DataReader.FromBuffer(manufacturerData.Data))
                {
                    reader.ReadBytes(data);
                }
                // Print the company ID + the raw data in hex format
                manufacturerDataString = string.Format("0x{0}: {1}",
                                                       manufacturerData.CompanyId.ToString("X"),
                                                       //BitConverter.ToString(data));
                                                       System.Text.Encoding.UTF8.GetString(data));
            }

            // Serialize UI update to the main UI thread
            await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
            {
                // Display these information on the list
                //ReceivedAdvertisementListBox.Items.Add(string.Format("[{0}]: type={1}, rssi={2}, name={3}, manufacturerData=[{4}]",
                //    timestamp.ToString("hh\\:mm\\:ss\\.fff"),
                //    advertisementType.ToString(),
                //    rssi.ToString(),
                //    localName,
                //    manufacturerDataString));
                ReceivedAdvertisementListBox.Items.Add(string.Format("[{0}]: rssi={1}, data='{2}'",
                                                                     timestamp.ToString("hh\\:mm\\:ss\\.fff"),
                                                                     rssi.ToString(),
                                                                     manufacturerDataString));
                ReceivedAdvertisementListBox.ScrollIntoView(ReceivedAdvertisementListBox.Items[ReceivedAdvertisementListBox.Items.Count - 1]);
            });
        }
 /// <summary>
 /// Handle background task completion.
 /// </summary>
 /// <param name="task">The task that is reporting completion.</param>
 /// <param name="e">Arguments of the completion report.</param>
 private async void OnBackgroundTaskCompleted(BackgroundTaskRegistration task, BackgroundTaskCompletedEventArgs eventArgs)
 {
     // We get the advertisement(s) processed by the background task
     if (ApplicationData.Current.LocalSettings.Values.Keys.Contains(taskName))
     {
         string backgroundMessage = (string)ApplicationData.Current.LocalSettings.Values[taskName];
         // Serialize UI update to the main UI thread
         await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
         {
             // Display these information on the list
             ReceivedAdvertisementListBox.Items.Add(backgroundMessage);
             ReceivedAdvertisementListBox.ScrollIntoView(ReceivedAdvertisementListBox.Items[ReceivedAdvertisementListBox.Items.Count - 1]);
         });
     }
 }