/// <summary>
/// Analyze the received Bluetooth LE advertisement, and either add a new unique
/// beacon to the list of known beacons, or update a previously known beacon
/// with the new information.
/// </summary>
/// <param name="btAdv">Bluetooth advertisement to parse, as received from
/// the Windows Bluetooth LE API.</param>
private void ReceivedBeacon(BeaconPacket btAdv)
{
if (btAdv == null)
{
return;
}
// Beacon was not yet known - add it to the list.
var newBeacon = new Beacon(btAdv);
BeaconReceived?.Invoke(this, newBeacon);
}
private void ScanCallback_OnAdvertisementPacketReceived(object sender, BeaconPacketArgs e)
{
#if DEBUG
lock (_bluetoothDevicesListLock)
{
if (!_bluetoothDevicesWeHaveReceivedBeaconsFrom.Contains(e.Data.BluetoothAddress))
{
SystemDebug.WriteLine($"Beacon received: {e.Data.BluetoothAddress:X} {e.Data.Region.Uuid}", LogTag);
_bluetoothDevicesWeHaveReceivedBeaconsFrom.Add(e.Data.BluetoothAddress);
}
}
#endif
if (e.Data.Region.Uuid.Replace("-", String.Empty).ToLower() != _beaconRegion.Uuid.Replace("-", String.Empty).ToLower())
{
return;
}
// matched UUID, this is the region we are looking for, set name
e.Data.Region.RegionName = _beaconRegion.RegionName;
lock (_lock)
{
try
{
_regionExitedCancellationTokenSource.Cancel();
_regionExitedCancellationTokenSource.Dispose();
}
catch (Exception) { }
_regionExitedCancellationTokenSource = new CancellationTokenSource();
_regionExitedCancellationToken = _regionExitedCancellationTokenSource.Token;
// start task to kick off region exit if no beacon is received for a period of time
_regionExitedWatchdogTask = Task.Run(WaitDelayAndCheckForRegionExited(_regionExitedCancellationToken), _cancellationToken);
// send region entered if region was exited and new beacon received,
// or if this is the first beacon we received
if (_wasRegionExitTriggered || !_wasFirstRegionEnterTriggered)
{
_wasFirstRegionEnterTriggered = true;
BeaconRegionEntered?.Invoke(this, new BeaconPacketArgs(e.Data));
}
BeaconReceived?.Invoke(this, new BeaconPacketArgs(e.Data));
_lastBeaconReceivedDateTime = DateTime.Now;
_wasRegionExitTriggered = false;
}
}