/// <summary>
/// Connect to an unconnected IMBLE device.
/// </summary>
/// <param name="device">An UnconnectedImbleDevice instance corresponding to the IMBLE device to connect to.</param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
public static async Task<ImbleDevice> ConnectAsync(UnconnectedImbleDevice device, CancellationToken cancellationToken)
{
var imble = new ImbleDevice();
// I tried to use DeviceInformation.FindAllAsync combined with BluetoothLEDevice.GetDeviceSelectorFromBluetoothAddress
// to obtain a device information corresponding to a Bluetooth address.
// But this implementation is not feasible because DeviceInformation.FindAllAsync takes 10 to 20 seconds.
// Thus, I've decided to use BluetoothLEDevice.FromBluetoothAddressAsync instead of DeviceInformation.FindAllAsync.
var bleDevice = await BluetoothLEDevice.FromBluetoothAddressAsync(device.Address);
var deviceInformation = bleDevice.DeviceInformation;
bleDevice.Dispose(); // Do not forget to dispose BLE related objects.
await imble.Initialize(deviceInformation, device.Address, cancellationToken);
return imble;
}
public UnconnectedDeviceViewModel(UnconnectedImbleDevice device)
{
this.Device = device;
this.Name = this.Device.Advertisement.LocalName;
var addressBytes = BitConverter.GetBytes(this.Device.Address);
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(addressBytes);
}
this.Address = string.Join(":", addressBytes.Select(@byte => @byte.ToString("X02")));
this.Rssi = this.Device.Rssi;
this.ConnectCommand = new ReactiveCommand();
this.ConnectCommand
.Select(_ => Observable.FromAsync(token => this.Device.Connect(token)))
.Switch()
.OnErrorRetry()
.Subscribe()
.AddTo(this.disposables);
}
public UnconnectedDeviceViewModel(UnconnectedImbleDevice device)
{
this.Device = device;
this.Name = this.Device.Advertisement.LocalName;
var addressBytes = BitConverter.GetBytes(this.Device.Address);
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(addressBytes);
}
this.Address = string.Join(":", addressBytes.Select(@byte => @byte.ToString("X02")));
this.Rssi = this.Device.Rssi;
this.ConnectCommand = new ReactiveCommand();
this.ConnectCommand
.Select(_ => Observable.FromAsync(token => this.Device.Connect(token)))
.Switch()
.OnErrorRetry()
.Subscribe()
.AddTo(this.disposables);
}
public DevicePageViewModel(UnconnectedImbleDevice unconnectedDevice)
{
this.Device = Observable.FromAsync(token => unconnectedDevice.Connect(token))
.CatchIgnore((Exception e) => { })
.ToReadOnlyReactiveProperty()
.AddTo(this.disposables);
this.IsConnected = this.Device.Select(device => device != null).ToReadOnlyReactiveProperty().AddTo(this.disposables);
this.DeviceStatus = this.Device
.Where(device => device != null)
.Select(device => device.ObserveProperty(self => self.Status))
.Switch()
.Do(value => Debug.WriteLine(value))
.ObserveOnUIDispatcher()
.ToReadOnlyReactiveProperty()
.AddTo(this.disposables);
this.ReceivedMessage = this.Device
.Where(device => device != null)
.Select(device => Observable.FromEventPattern <DataArrivedEventArgs>(handler => device.DataArrived += handler, handler => device.DataArrived -= handler))
.Switch()
.Select(args => new ReceivedMessageViewModel(args.EventArgs.Data, args.EventArgs.Timestamp))
.OnErrorRetry()
.ToReadOnlyReactiveProperty()
.AddTo(this.disposables);
var notBusyNotifier = new BooleanNotifier(false);
this.Name = new ReactiveProperty <string>("Fuga")
.SetValidateNotifyError(value => value != null && Encoding.UTF8.GetByteCount(value) < 12 ? null : "Input short message")
.AddTo(this.disposables);
this.CanSendCommand = Observable.CombineLatest(
this.DeviceStatus.Select(status => status == ImbleDeviceStatus.Running),
this.Name.ObserveHasErrors,
notBusyNotifier.Do(value => Debug.WriteLine(value)),
(isRunning, hasErrors, notBusy) => isRunning && !hasErrors && notBusy)
.ToReadOnlyReactiveProperty().AddTo(this.disposables);
notBusyNotifier.TurnOn();
this.SendCommand = this.CanSendCommand.ToReactiveCommand().AddTo(this.disposables);
this.SendCommand
.Do(_ => notBusyNotifier.TurnOff())
.Select(_ =>
{
var data = Encoding.UTF8.GetBytes(this.Name.Value);
return(Observable.FromAsync(token =>
{
using (var timeoutTokenSource = new CancellationTokenSource(TimeSpan.FromSeconds(5)))
using (var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(token, timeoutTokenSource.Token))
{
return this.Device.Value.SendAsync(data, 0, data.Length, linkedTokenSource.Token);
}
})
.Finally(() => notBusyNotifier.TurnOn()));
})
.Switch()
.OnErrorRetry((Exception e) => Debug.WriteLine(e))
.Subscribe()
.AddTo(this.disposables);
}
public DevicePageViewModel(UnconnectedImbleDevice unconnectedDevice)
{
this.Device = Observable.FromAsync(token => unconnectedDevice.Connect(token))
.CatchIgnore((Exception e) => { })
.ToReadOnlyReactiveProperty()
.AddTo(this.disposables);
this.IsConnected = this.Device.Select(device => device != null).ToReadOnlyReactiveProperty().AddTo(this.disposables);
this.DeviceStatus = this.Device
.Where(device => device != null)
.Select(device => device.ObserveProperty(self => self.Status))
.Switch()
.Do(value => Debug.WriteLine(value))
.ObserveOnUIDispatcher()
.ToReadOnlyReactiveProperty()
.AddTo(this.disposables);
this.ReceivedMessage = this.Device
.Where(device => device != null)
.Select(device => Observable.FromEventPattern<DataArrivedEventArgs>(handler => device.DataArrived += handler, handler => device.DataArrived -= handler))
.Switch()
.Select(args => new ReceivedMessageViewModel(args.EventArgs.Data, args.EventArgs.Timestamp))
.OnErrorRetry()
.ToReadOnlyReactiveProperty()
.AddTo(this.disposables);
var notBusyNotifier = new BooleanNotifier(false);
this.Name = new ReactiveProperty<string>("Fuga")
.SetValidateNotifyError(value => value != null && Encoding.UTF8.GetByteCount(value) < 12 ? null : "Input short message")
.AddTo(this.disposables);
this.CanSendCommand = Observable.CombineLatest(
this.DeviceStatus.Select(status => status == ImbleDeviceStatus.Running),
this.Name.ObserveHasErrors,
notBusyNotifier.Do(value => Debug.WriteLine(value)),
(isRunning, hasErrors, notBusy) => isRunning && !hasErrors && notBusy)
.ToReadOnlyReactiveProperty().AddTo(this.disposables);
notBusyNotifier.TurnOn();
this.SendCommand = this.CanSendCommand.ToReactiveCommand().AddTo(this.disposables);
this.SendCommand
.Do(_ => notBusyNotifier.TurnOff())
.Select(_ =>
{
var data = Encoding.UTF8.GetBytes(this.Name.Value);
return Observable.FromAsync(token =>
{
using (var timeoutTokenSource = new CancellationTokenSource(TimeSpan.FromSeconds(5)))
using (var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(token, timeoutTokenSource.Token))
{
return this.Device.Value.SendAsync(data, 0, data.Length, linkedTokenSource.Token);
}
})
.Finally(() => notBusyNotifier.TurnOn());
})
.Switch()
.OnErrorRetry((Exception e) => Debug.WriteLine(e))
.Subscribe()
.AddTo(this.disposables);
}
