async Task DoFallbackReconnect(GattConnectionConfig config, CancellationToken ct)
{
if (this.Status == ConnectionStatus.Connected)
{
Log.Debug("Reconnect", "Reconnection successful");
}
else
{
this.context.Close(); // kill current gatt
if (ct.IsCancellationRequested)
{
Log.Debug("Reconnect", "Reconnection loop cancelled");
}
else
{
Log.Debug("Reconnect", "Reconnection failed - handing off to android autoReconnect");
try
{
await this.context.Connect(config.Priority, true);
}
catch (Exception ex)
{
Log.Error("Reconnect", "Reconnection failed to hand off - " + ex);
}
}
}
}
async Task DoReconnect(GattConnectionConfig config, CancellationToken ct)
{
Log.Debug("Reconnect", "Starting reconnection loop");
this.connSubject.OnNext(ConnectionStatus.Connecting);
var attempts = 1;
while (!ct.IsCancellationRequested &&
this.Status != ConnectionStatus.Connected &&
attempts <= CrossBleAdapter.AndroidMaxAutoReconnectAttempts)
{
Log.Write("Reconnect", "Reconnection Attempt " + attempts);
// breathe before attempting (again)
await Task.Delay(
CrossBleAdapter.AndroidPauseBetweenAutoReconnectAttempts,
ct
);
try
{
await this.context.Reconnect(config.Priority);
}
catch (Exception ex)
{
Log.Warn("Reconnect", "Error reconnecting " + ex);
}
attempts++;
}
if (this.Status != ConnectionStatus.Connected)
{
await this.DoFallbackReconnect(config, ct);
}
}
// TODO: do I need to watch for connection errors here? IDisposable CreateAutoReconnectSubscription(GattConnectionConfig config) => this .WhenStatusChanged() .Skip(1) // skip the initial "Disconnected" .Where(x => x == ConnectionStatus.Disconnected) .Select(_ => Observable.FromAsync(ct1 => this.DoReconnect(config, ct1))) .Merge() .Subscribe();
protected virtual void SetupAutoReconnect(GattConnectionConfig config)
{
if (this.ReconnectSubscription != null)
{
return;
}
if (!config.IsPersistent)
{
return;
}
this.cancelReconnect = false;
this.ReconnectSubscription = this.WhenStatusChanged()
.Skip(1) // skip the initial registration
.Where(x => x == ConnectionStatus.Disconnected)
.Subscribe(async x =>
{
while (!this.cancelReconnect && this.Status != ConnectionStatus.Connected)
{
try
{
await Task.Delay(300);
if (!this.cancelReconnect)
{
await this.Connect(config);
}
}
catch (Exception ex)
{
Log.Out("Failed to reconnect to device - " + ex);
}
}
});
}
public IObservable <object> Connect(GattConnectionConfig config)
{
// TODO: configurable "connection" type - RSSI check, timed read on first characteristic, device watcher
// TODO: monitor devicewatcher - if removed d/c, if added AND paired - connected
this.connSubject.OnNext(ConnectionStatus.Connected);
this.status = ConnectionStatus.Connected;
return(Observable.Return(new object()));
}
public override IObservable <object> Connect(GattConnectionConfig config)
=> Observable.Create <object>(ob =>
{
var sub = this.WhenStatusChanged()
.Where(x => x == ConnectionStatus.Connected)
.Subscribe(_ => ob.Respond(null));
this.context.Connect();
return(sub);
});
public override IObservable <object> Connect(GattConnectionConfig config)
{
config = config ?? GattConnectionConfig.DefaultConfiguration;
this.SetupAutoReconnect(config);
return(Observable.Create <object>(ob =>
{
var cancelSrc = new CancellationTokenSource();
var connected = this
.WhenStatusChanged()
.Take(1)
.Where(x => x == ConnectionStatus.Connected)
.Subscribe(_ => ob.Respond(null));
if (this.Status != ConnectionStatus.Connecting)
{
try
{
ob.OnNext(ConnectionStatus.Connecting);
switch (AndroidConfig.ConnectionThread)
{
case ConnectionThread.MainThread:
Application.SynchronizationContext.Post(_ => this.Context.Connect(config), null);
break;
case ConnectionThread.ScanThread:
Task.Factory.StartNew(
() => this.Context.Connect(config),
cancelSrc.Token,
TaskCreationOptions.None,
this.scheduler
);
break;
case ConnectionThread.Default:
default:
this.Context.Connect(config);
break;
}
}
catch (Exception ex)
{
ob.OnNext(ConnectionStatus.Disconnected);
ob.OnError(ex);
}
}
return () =>
{
connected?.Dispose();
cancelSrc.Dispose();
};
}));
}
public override IObservable <object> Connect(GattConnectionConfig config)
=> Observable.FromAsync(async token =>
{
//if (this.native == null)
//this.native = await BluetoothLEDevice.FromIdAsync(this.deviceId);
//this.native = await BluetoothLEDevice.FromBluetoothAddressAsync(0L);
this.status = ConnectionStatus.Connected;
this.connSubject.OnNext(ConnectionStatus.Connected);
return(new object());
});
protected void DoConnect(IObserver <object> ob, GattConnectionConfig config)
{
try
{
this.connSubject.OnNext(ConnectionStatus.Connecting);
if (!this.context.Connect(config))
{
throw new ArgumentException("Unable to connect");
}
ob.Respond(null);
}
catch (Exception ex)
{
this.connSubject.OnNext(ConnectionStatus.Disconnected);
ob.OnError(ex);
}
}
public override IObservable <object> Connect(GattConnectionConfig config)
{
config = config ?? GattConnectionConfig.DefaultConfiguration;
this.SetupAutoReconnect(config);
return(Observable.Create <object>(ob =>
{
IDisposable sub1 = null;
IDisposable sub2 = null;
if (this.Status == ConnectionStatus.Connected)
{
ob.Respond(null);
}
else
{
sub1 = this.context
.PeripheralConnected
.Where(x => x.Equals(this.peripheral))
.Subscribe(x => ob.Respond(null));
sub2 = this.context
.FailedConnection
.Where(x => x.Peripheral.Equals(this.peripheral))
.Subscribe(x => ob.OnError(new Exception(x.Error.ToString())));
this.context.Manager.ConnectPeripheral(this.peripheral, new PeripheralConnectionOptions
{
NotifyOnDisconnection = config.NotifyOnDisconnect,
#if __IOS__ || __TVOS__
NotifyOnConnection = config.NotifyOnConnect,
NotifyOnNotification = config.NotifyOnNotification
#endif
});
}
return () =>
{
sub1?.Dispose();
sub2?.Dispose();
};
}));
}
public override IObservable <object> Connect(GattConnectionConfig config)
=> Observable.Create <object>(ob =>
{
config = config ?? GattConnectionConfig.DefaultConfiguration;
IDisposable sub1 = null;
IDisposable sub2 = null;
if (this.Status == ConnectionStatus.Connected)
{
ob.Respond(null);
}
else
{
sub1 = this.context
.PeripheralConnected
.Where(x => x.Equals(this.peripheral))
.Subscribe(x =>
{
if (config.IsPersistent)
{
this.autoReconnect = this.SetupAutoReconnect();
}
ob.Respond(null);
});
sub2 = this.context
.FailedConnection
.Where(x => x.Peripheral.Equals(this.peripheral))
.Subscribe(x => ob.OnError(new Exception(x.Error.ToString())));
this.DoConnection();
}
return(() =>
{
sub1?.Dispose();
sub2?.Dispose();
});
});
public override IObservable <object> Connect(GattConnectionConfig config) => Observable.Create <object>(async ob =>
{
var connected = false;
config = config ?? GattConnectionConfig.DefaultConfiguration;
var sub1 = this.WhenStatusChanged()
.Where(x => x == ConnectionStatus.Connected)
.Subscribe(_ =>
{
connected = true;
if (config.IsPersistent)
{
this.autoReconnectSub = this.CreateAutoReconnectSubscription(config);
}
ob.Respond(null);
});
var sub2 = this.connFailSubject.Subscribe(x =>
{
this.connSubject.OnNext(ConnectionStatus.Disconnected);
this.context.Gatt?.Close();
ob.OnError(new Exception("Connection failed - " + x));
});
this.connSubject.OnNext(ConnectionStatus.Connecting);
await this.context.Connect(config.Priority, config.AndroidAutoConnect);
return(() =>
{
if (!connected)
{
this.context.Gatt?.Close();
this.connSubject.OnNext(ConnectionStatus.Disconnected);
}
sub1.Dispose();
sub2.Dispose();
});
});
public abstract IObservable <object> Connect(GattConnectionConfig config);
public override IObservable <object> Connect(GattConnectionConfig config)
{
throw new NotImplementedException();
}
public override IObservable <object> Connect(GattConnectionConfig config) => Observable.Create <object>(ob =>
{
this.native.GattConnect(config.AutoConnect);
return(() => { });
});
