private async void StartScan()
{
Log.Debug("StartScan. BLE adapter. enabled={0}", m_adapter.IsEnabled);
if (IsScanning)
{
return;
}
if (!m_adapter.IsEnabled)
{
m_dialogs.Toast("Cannot start scan, Bluetooth is turned off");
return;
}
StopScan();
IsScanning = true;
m_scanCancel = new CancellationTokenSource(TimeSpan.FromSeconds(30));
await m_adapter.ScanForDevices(
Observer.Create(
( IBlePeripheral peripheral ) =>
{
Device.BeginInvokeOnMainThread(
() =>
{
var existing = FoundDevices.FirstOrDefault(d => d.Equals(peripheral));
if (existing != null)
{
/*
* Log.Trace(
* "Advertisement. rssi={2} name={3} address={0} id={1}",
* device.Address.EncodeToBase16String(),
* device.DeviceId,
* device.Rssi,
* device.Advertisement.DeviceName );
* Log.Trace(
* " services={0} tx={1} service-data={2}",
* device.Advertisement.Services.Select( x => x.ToString() ).Join( "," ),
* device.Advertisement.TxPowerLevel,
* device.Advertisement.ServiceData.Select( x => x.Key + ":" + x.Value.EncodeToBase16String() ).Join( "," ) );
* Log.Trace(
* " flags={0} mfg-data={1}",
* device.Advertisement.Flags,
* device.Advertisement.ManufacturerSpecificData.Select(
* x => GetManufacturerName( x.Key ) + ":" + x.Value.EncodeToBase16String() ).Join( "," ) );
* //*/
existing.Update(peripheral);
}
else
{
FoundDevices.Add(new BlePeripheralViewModel(peripheral));
}
});
}), m_scanCancel.Token);
IsScanning = false;
}
/// <summary>
/// Scan for nearby BLE device advertisements. Stop scanning when <paramref name="token" /> is cancelled.
/// </summary>
/// <param name="adapter">The adapter to use for scanning</param>
/// <param name="advertisementDiscovered">Callback to notify for each discovered advertisement</param>
public static Task ScanForDevices(this IBluetoothLowEnergyAdapter adapter,
Action <IBlePeripheral> advertisementDiscovered, CancellationToken token)
{
return(adapter.ScanForDevices(Observer.Create(advertisementDiscovered), token));
}
/// <summary>
/// Scan for nearby BLE device advertisements. Stop scanning after <paramref name="timeout" />
/// </summary>
/// <param name="adapter">The adapter to use for scanning</param>
/// <param name="advertisementDiscovered">Callback to notify for each discovered advertisement</param>
/// <param name="timeout">cancel scan after this length of time</param>
public static Task ScanForDevices(this IBluetoothLowEnergyAdapter adapter,
IObserver <IBlePeripheral> advertisementDiscovered, TimeSpan timeout)
{
return(adapter.ScanForDevices(advertisementDiscovered, new CancellationTokenSource(timeout).Token));
}