/// <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]);
});
}
}