// callback receiving advertising frames
private void WatcherOnReceived(BluetoothLEAdvertisementWatcher sender, BluetoothLEAdvertisementReceivedEventArgs args)
{
// Only "our" beacons
if (ActiveBeacons.Count(b => b == args.BluetoothAddress) == 0)
{
return;
}
Debug.WriteLine($"BLE address {args.BluetoothAddress:X}");
// iterate data sections
var dataSections = args.Advertisement.DataSections;
if (dataSections != null)
{
foreach (var data in dataSections)
{
byte[] payload = data.Data.ToArray();
Debug.WriteLine($"DataFrame Type 0x{data.DataType:X} {Helper.ToHexString(data.Data.ToArray())}");
// IS our eddystone telemetry beacon
if (args.BluetoothAddress == IceBlueBeaconBleAddress)
{
// see eddystone spec, for detecting tlm frame
if (data.DataType == 0x16 && payload[0] == 0xAA && payload[1] == 0xFE && payload[2] == 0x20)
{
// decode sensor values
int batteryLevel = Helper.ToUint16(payload, 4);
int temp = Helper.ToUint16(payload, 6);
double temperature = temp != int.MinValue ? temp / 256d : temp;
Debug.WriteLine($"Received {args.Timestamp.DateTime} battery {batteryLevel} mV {temperature} ℃ Signal strength {args.RawSignalStrengthInDBm} dbm");
}
}
// is the blukii beacon
if (args.BluetoothAddress == BlukiiBeaconBleAddress)
{
// detecting environmental frame of blukii => specs in slides
if (data.DataType == 0xFF && payload.Length >= 22 && payload[14] == 0x10)
{
// decode sensor values
int batteryPercent = (int)payload[12];
double temperature = Helper.GetBluekiiTemperature(payload, 20);
int humidity = (int)payload[19];
double luminosity = Helper.ToUint16(payload, 17);
int pressure = Helper.ToUint16(payload, 15);
Debug.WriteLine($"Blukii Received {args.Timestamp.DateTime} battery {batteryPercent} % {temperature} ℃ {Environment.NewLine}humidity {humidity} % Lux {luminosity} lx pressure {pressure} hpa signal strength {args.RawSignalStrengthInDBm} dbm");
}
}
}
}
Debug.WriteLine($"");
}
public MainPage()
{
ThreadHelper.Initialize(Environment.CurrentManagedThreadId, this.Dispatcher);
this.InitializeComponent();
// Fill list of active beacons
ActiveBeacons.Add(IceBlueBeaconBleAddress);
ActiveBeacons.Add(BlukiiBeaconBleAddress);
// Create viewmodel and set the data context
DataContext = MainPageViewModel = new MainPageViewModel();
}
