protected virtual IObservable <IScanResult> DoScan(ScanConfig config) => Observable.Create <IScanResult>(ob =>
{
this.context.Clear();
return(this.context
.CreateAdvertisementWatcher(config)
.Subscribe(async args => // CAREFUL
{
var device = this.context.GetDevice(args.BluetoothAddress);
if (device == null)
{
var btDevice = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress);
if (btDevice != null)
{
device = this.context.AddDevice(args.BluetoothAddress, btDevice);
}
}
if (device != null)
{
var adData = new AdvertisementData(args);
var scanResult = new ScanResult(device, args.RawSignalStrengthInDBm, adData);
ob.OnNext(scanResult);
}
}));
});
public override IObservable <IScanResult> Scan(ScanConfig config)
{
if (this.IsScanning)
{
throw new ArgumentException("There is already an active scan");
}
return(Observable.Create <IScanResult>(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.GetDevice(args.BluetoothAddress);
if (device == null)
{
var btDevice = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress);
if (btDevice != null)
{
device = this.context.AddOrGetDevice(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 IObservable <IScanResult> ScanListen()
{
IDisposable adWatcher = null;
IDisposable devWatcher = null;
this.scanListenOb = this.scanListenOb ?? Observable.Create <IScanResult>(ob =>
this.WhenScanningStatusChanged().Subscribe(scan =>
{
if (!scan)
{
adWatcher?.Dispose();
devWatcher?.Dispose();
}
else
{
this.context.Clear();
adWatcher = this.context
.CreateAdvertisementWatcher()
.Subscribe(args =>
{
var device = this.context.GetDevice(args.BluetoothAddress);
if (device == null)
{
Debug.WriteLine("Device not found yet - " + args.BluetoothAddress);
// causes Element Not Found exception
//var native = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress);
//device = this.context.GetDevice(native);
return;
}
var adData = new AdvertisementData(args);
var scanResult = new ScanResult(device, args.RawSignalStrengthInDBm, adData);
ob.OnNext(scanResult);
});
devWatcher = this.context
.CreateDeviceWatcher()
.Subscribe(async args =>
{
Debug.WriteLine($"[DeviceInfo] Info: {args.Id} / {args.Name}");
var native = await BluetoothLEDevice.FromIdAsync(args.Id);
Debug.WriteLine($"[DeviceInfo] BLE Device: {native.BluetoothAddress} / {native.DeviceId} / {native.Name}");
this.context.GetDevice(native); // set discovered device for adscanner to see
});
}
})
)
.Publish()
.RefCount();
return(this.scanListenOb);
}