public override IObservable <ScanResult> Scan(ScanConfig?config = null)
{
if (this.IsScanning)
{
throw new ArgumentException("There is already an active scan");
}
return(Observable.Create <ScanResult>(ob =>
{
this.IsScanning = true;
this.context.Clear();
var sub = this
.WhenRadioReady()
.Where(rdo => rdo != null)
.Select(_ => this.CreateScanner(config))
.Switch()
.Subscribe(
async args => // CAREFUL
{
var device = this.context.GetPeripheral(args.BluetoothAddress);
if (device == null)
{
var btDevice = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress);
if (btDevice != null)
{
device = this.context.AddOrGetPeripheral(btDevice);
}
}
if (device != null)
{
var adData = new AdvertisementData(args);
var scanResult = new ScanResult(device, args.RawSignalStrengthInDBm, adData);
ob.OnNext(scanResult);
}
},
ob.OnError
);
var stopSub = this.scanSubject.Subscribe(_ =>
{
this.IsScanning = false;
sub?.Dispose();
ob.OnCompleted();
});
return () =>
{
this.IsScanning = false;
sub?.Dispose();
stopSub?.Dispose();
};
}));
}
public override IObservable <ScanResult> Scan(ScanConfig?config = null)
{
if (this.IsScanning)
{
throw new ArgumentException("There is already an active scan");
}
return(this.RequestAccess()
.Do(result =>
{
if (result != AccessState.Available)
{
throw new PermissionException("BluetoothLE", result);
}
this.IsScanning = true;
this.context.Clear();
})
.Select(_ => this.GetRadio())
.Switch()
.Select(_ => this.CreateScanner(config))
.Switch()
.Select(args => Observable.FromAsync(async ct =>
{
var device = this.context.GetPeripheral(args.BluetoothAddress);
if (device == null)
{
var btDevice = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress);
if (btDevice != null)
{
device = this.context.AddOrGetPeripheral(btDevice);
}
}
ScanResult?scanResult = null;
if (device != null)
{
var adData = new AdvertisementData(args);
scanResult = new ScanResult(device, args.RawSignalStrengthInDBm, adData);
}
return scanResult;
}))
.Where(x => x != null)
.Finally(() => this.IsScanning = false)
.Switch() !);
}