bool IsRepeatAdvertisement(BluetoothLEStreamSocketAdvertisement advertisement)
{
return(
this.uniqueAdvertisements.Exists(
e => ((e.Port == advertisement.Port) &&
(e.Address.ToString() == advertisement.Address.ToString()))));
}
void OnBluetoothAdvertisementSpotted(
BluetoothLEAdvertisementWatcher sender,
BluetoothLEAdvertisementReceivedEventArgs args)
{
foreach (var item in args.Advertisement.GetManufacturerDataByCompanyId(
BluetoothLEStreamSocketAdvertisement.MS_BLUETOOTH_LE_ID))
{
var advertisement = BluetoothLEStreamSocketAdvertisement.ReadFromBuffer(item.Data);
if (advertisement != null)
{
if ((advertisement.Address.ToString() != this.localAddress.ToString()) &&
!IsRepeatAdvertisement(advertisement))
{
this.StreamSocketDiscovered?.Invoke(this,
new BluetoothLEStreamSocketDiscoveredEventArgs()
{
Advertisement = advertisement
});
this.uniqueAdvertisements.Add(advertisement);
}
}
}
}
public static BluetoothLEStreamSocketAdvertisement ReadFromBuffer(IBuffer buffer)
{
BluetoothLEStreamSocketAdvertisement returnValue = null;
var dataReader = DataReader.FromBuffer(buffer);
if (dataReader.UnconsumedBufferLength >= Marshal.SizeOf <UInt32>())
{
var magicHeader = dataReader.ReadUInt32();
if (magicHeader == MAGIC_HEADER)
{
returnValue = new BluetoothLEStreamSocketAdvertisement();
var bitLength = dataReader.ReadUInt16();
var bits = new byte[bitLength];
dataReader.ReadBytes(bits);
returnValue.Address = new IPAddress(bits);
returnValue.Port = dataReader.ReadUInt16();
}
}
return(returnValue);
}
public async Task StartAsync()
{
if (this.address == null)
{
await this.CreateForLocalInternetProfileAsync();
}
this.SocketListener.ConnectionReceived += OnConnectionReceived;
// Advertise it over Bluetooth LE.
var advert = new BluetoothLEStreamSocketAdvertisement(
address,
ushort.Parse(this.SocketListener.Information.LocalPort));
var advertBuffer = advert.WriteToBuffer();
var manufacturerData = new BluetoothLEManufacturerData(
BluetoothLEStreamSocketAdvertisement.MS_BLUETOOTH_LE_ID, advertBuffer);
this.bluetoothPublisher = new BluetoothLEAdvertisementPublisher();
this.bluetoothPublisher.Advertisement.ManufacturerData.Add(manufacturerData);
this.bluetoothPublisher.Start();
}