public iOSBluetoothDeviceProximityProbe()
{
_bluetoothCentralManagerDelegate = new iOSBluetoothDeviceProximityProbeCentralManagerDelegate(this);
_bluetoothCentralManagerDelegate.DeviceIdEncountered += async(sender, bluetoothDeviceProximityDatum) =>
{
// we have no cancellation token. thus, all that can happen here is that the datum is stored locally
// and surveys are triggered (if any are defined). size- and force-commits will not result, and this
// is important because we might be currently executing from the background on a bluetooth scan result.
await StoreDatumAsync(bluetoothDeviceProximityDatum, null);
};
}
protected override async Task ScanAsync(CancellationToken cancellationToken)
{
try
{
// start a fresh manager delegate to collect/read results
_bluetoothCentralManagerDelegate = new iOSBluetoothDeviceProximityProbeCentralManagerDelegate(_deviceIdService, _deviceIdCharacteristic, this);
// initialize manager, which starts scan.
_bluetoothCentralManager = new CBCentralManager(_bluetoothCentralManagerDelegate,
new DispatchQueue("ble"),
NSDictionary.FromObjectAndKey(NSNumber.FromBoolean(false), CBCentralManager.OptionShowPowerAlertKey)); // the base class handles prompting using to turn on bluetooth and stops the probe if the user does not.
TaskCompletionSource <bool> scanCompletionSource = new TaskCompletionSource <bool>();
cancellationToken.Register(() =>
{
try
{
_bluetoothCentralManager.StopScan();
}
catch (Exception ex)
{
SensusServiceHelper.Get().Logger.Log("Exception while stopping scan: " + ex.Message, LoggingLevel.Normal, GetType());
}
finally
{
_bluetoothCentralManager = null;
scanCompletionSource.TrySetResult(true);
}
});
await scanCompletionSource.Task;
}
catch (Exception ex)
{
SensusServiceHelper.Get().Logger.Log("Exception while scanning: " + ex.Message, LoggingLevel.Normal, GetType());
}
}
