/// <summary>
/// Checks if the background filters are up-to-date or not. To update the filters,
/// unregister and register background task again
/// (call BackgroundTaskManager.UpdateBackgroundTaskAsync()).
/// </summary>
/// <returns>True, if an update is required. False otherwise.</returns>
public static bool CheckIfBackgroundFilterUpdateIsRequired()
{
bool isRequired = SdkData.BackgroundFilterUpdateRequired;
if (!isRequired && !string.IsNullOrEmpty(SdkData.LayoutBeaconId1Hash))
{
string upToDateHash = LayoutManager.CreateHashOfBeaconId1SInLayout(ServiceManager.LayoutManager.Layout);
if (!string.IsNullOrEmpty(upToDateHash) &&
!SdkData.LayoutBeaconId1Hash.Equals(upToDateHash))
{
SdkData.LayoutBeaconId1Hash = upToDateHash;
SdkData.BackgroundFilterUpdateRequired = true;
isRequired = true;
}
}
return(isRequired);
}
/// <summary>
/// Registers the BLE advertisement watcher background task.
/// </summary>
/// <param name="configuration">Configuration for the new registration.</param>
/// <returns>The registration result.</returns>
private async Task <BackgroundTaskRegistrationResult> RegisterAdvertisementWatcherBackgroundTaskAsync(SdkConfiguration configuration)
{
BackgroundTaskRegistrationResult result = new BackgroundTaskRegistrationResult()
{
Success = false,
Exception = null
};
if (BackgroundTaskRegistered(AdvertisementClass))
{
// Already registered
Logger.Debug("BackgroundTaskManager.RegisterAdvertisementWatcherBackgroundTask(): Already registered");
result.Success = true;
}
else
{
BackgroundTaskBuilder backgroundTaskBuilder = new BackgroundTaskBuilder();
backgroundTaskBuilder.Name = AdvertisementClass + Guid.NewGuid();
backgroundTaskBuilder.TaskEntryPoint = configuration.BackgroundAdvertisementClassName;
BluetoothLEAdvertisementWatcherTrigger advertisementWatcherTrigger = new BluetoothLEAdvertisementWatcherTrigger();
// This filter includes all Sensorberg beacons
var pattern = BeaconFactory.UuidToAdvertisementBytePattern(configuration.BackgroundBeaconUuidSpace, configuration.ManufacturerId, configuration.BeaconCode);
advertisementWatcherTrigger.AdvertisementFilter.BytePatterns.Add(pattern);
ILayoutManager layoutManager = ServiceManager.LayoutManager;
AppSettings = await ServiceManager.SettingsManager.GetSettings();
// Using MaxSamplingInterval as SamplingInterval ensures that we get an event only
// when entering or exiting from the range of the beacon
advertisementWatcherTrigger.SignalStrengthFilter.SamplingInterval = advertisementWatcherTrigger.MaxSamplingInterval;
if (AppSettings.RssiEnterThreshold != null && AppSettings.RssiEnterThreshold.Value >= -128 &&
AppSettings.RssiEnterThreshold.Value <= 127)
{
advertisementWatcherTrigger.SignalStrengthFilter.InRangeThresholdInDBm = AppSettings.RssiEnterThreshold;
}
else
{
advertisementWatcherTrigger.SignalStrengthFilter.InRangeThresholdInDBm = Constants.DefaultBackgroundScannerEnterThreshold;
}
advertisementWatcherTrigger.SignalStrengthFilter.OutOfRangeThresholdInDBm = SignalStrengthFilterOutOfRangeThresholdInDBm;
advertisementWatcherTrigger.SignalStrengthFilter.OutOfRangeTimeout = TimeSpan.FromMilliseconds(AppSettings.BeaconExitTimeout);
IBackgroundTrigger trigger = advertisementWatcherTrigger;
backgroundTaskBuilder.SetTrigger(trigger);
try
{
BackgroundTaskRegistration backgroundTaskRegistration = backgroundTaskBuilder.Register();
backgroundTaskRegistration.Completed += OnAdvertisementWatcherBackgroundTaskCompleted;
backgroundTaskRegistration.Progress += OnAdvertisementWatcherBackgroundTaskProgress;
result.Success = true;
}
catch (Exception ex)
{
result.Exception = ex;
Logger.Error("BackgroundTaskManager.RegisterAdvertisementWatcherBackgroundTask(): Failed to register: ", ex);
if (ex.Message.Contains("0x800710DF)"))
{
await Window.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async() => await new MessageDialog("Activate Bluetooth for the app").ShowAsync());
}
}
if (result.Success)
{
// Check if there was a pending filter update
if (SdkData.BackgroundFilterUpdateRequired)
{
string upToDateHash = LayoutManager.CreateHashOfBeaconId1SInLayout(layoutManager.Layout);
if (!string.IsNullOrEmpty(upToDateHash) && SdkData.LayoutBeaconId1Hash.Equals(upToDateHash))
{
// Background filter updated successfully
SdkData.BackgroundFilterUpdateRequired = false;
BackgroundFiltersUpdated?.Invoke(this, null);
}
}
else if (string.IsNullOrEmpty(SdkData.LayoutBeaconId1Hash))
{
// This is the first time the background task is registered with valid layout =>
// set the hash
string upToDateHash = LayoutManager.CreateHashOfBeaconId1SInLayout(layoutManager.Layout);
if (!string.IsNullOrEmpty(upToDateHash))
{
SdkData.LayoutBeaconId1Hash = upToDateHash;
}
}
}
}
//Load last events from background
await LoadBackgroundActions();
return(result);
}
