/// <summary> /// /// </summary> /// <param name="characteristic"></param> /// <param name="useIndicationIfAvailable"></param> /// <returns></returns> public static IObservable <CharacteristicResult> RegisterAndNotify(this IGattCharacteristic characteristic, bool useIndicationIfAvailable = false) => characteristic .EnableNotifications(useIndicationIfAvailable) .Where(x => x) .Select(x => characteristic.WhenNotificationReceived()) .Switch() .Finally(() => characteristic.DisableNotifications().Subscribe());
/// <summary>
/// Enables notifications and hooks it for discovered characteristic. When subscription is disposed, it will also clean up.
/// </summary>
/// <param name="characteristic"></param>
/// <param name="useIndicationIfAvailable"></param>
/// <returns></returns>
public static IObservable <CharacteristicGattResult> RegisterAndNotify(this IGattCharacteristic characteristic, bool useIndicationIfAvailable = false)
=> characteristic
.EnableNotifications(useIndicationIfAvailable)
.Select(x => x.Characteristic.WhenNotificationReceived())
.Switch()
.Finally(() => characteristic
.DisableNotifications()
.Where(x => x.Characteristic.Service.Device.Status == ConnectionStatus.Connected)
.Subscribe(
_ => {},
ex => Log.Warn(
BleLogCategory.Characteristic,
"Could not cleanly disable notifications in RegisterAndNotify - " + ex
)
)
);
/// <summary>
/// Enables notifications and hooks it for discovered characteristic. When subscription is disposed, it will also clean up.
/// </summary>
/// <param name="characteristic"></param>
/// <param name="useIndicationIfAvailable"></param>
/// <param name="autoCleanup"></param>
/// <returns></returns>
public static IObservable <CharacteristicGattResult> RegisterAndNotify(this IGattCharacteristic characteristic, bool useIndicationIfAvailable = false, bool autoCleanup = true)
{
var ob = characteristic
.EnableNotifications(useIndicationIfAvailable)
.Select(x => x.Characteristic.WhenNotificationReceived())
.Switch();
if (autoCleanup)
{
ob = ob.Finally(() => characteristic
.DisableNotifications()
.Where(x => x.Characteristic.Service.Peripheral.Status == ConnectionState.Connected)
.Subscribe(
_ => { },
ex => Log.Write(ex)
)
);
}
return(ob);
}
/// <summary>
/// Switch device in Secure DFU state
/// ! IMPORTANT, assumes that each device has different name !
/// </summary>
/// <param name="device"></param>
/// <returns>Device which is in buttonles state</returns>
private async Task <IDevice> ButtonlessDFUWithoutBondsToSecureDFU(IDevice device)
{
Debug.WriteLineIf(LogLevelDebug, String.Format("Start of Buttonless switching"));
//await RefreshGattAsync(device);
IGattCharacteristic buttonlessCharacteristic = null;
TaskCompletionSource <CharacteristicGattResult> notif = null;
device.Connect();
device = await device.ConnectWait().Timeout(DeviceConnectionTimeout);
buttonlessCharacteristic = await device.GetKnownCharacteristics(DfuService, DfuButtonlessCharacteristicWithoutBonds).Timeout(OperationTimeout);
await buttonlessCharacteristic.EnableNotifications(true).Timeout(OperationTimeout);
// Change device Name
// Advertisment name should not be longer than 20 symbols
var newFullName = device.Name + "DFU";
var newName = new string(newFullName.Take(20).ToArray());
byte[] name = Encoding.ASCII.GetBytes(newName);
int newNameLen = name.Length;
byte[] newNameCommand = new byte[newNameLen + 1 + 1];
newNameCommand[0] = CChangeAdvertisedName;
newNameCommand[1] = (byte)(uint)newNameLen;
name.CopyTo(newNameCommand, 2);
var nameChangeNotif = GetTimedNotification(buttonlessCharacteristic);
await buttonlessCharacteristic.Write(newNameCommand).Timeout(OperationTimeout);
var nameChangeResult = await nameChangeNotif.Task;
Debug.WriteLineIf(LogLevelDebug, String.Format("Device name change response {0}", nameChangeResult.Data != null ? BitConverter.ToString(nameChangeResult.Data) : "Empty"));
// Jump from the main application to Secure DFU bootloader (Secure DFU mode)
notif = GetTimedNotification(buttonlessCharacteristic);
await buttonlessCharacteristic.Write(CEnterDFU).Timeout(OperationTimeout);
var result = await notif.Task;
Debug.WriteLineIf(LogLevelDebug, String.Format("Restart response {0}", result.Data != null ? BitConverter.ToString(result.Data) : "Empty"));
await buttonlessCharacteristic.DisableNotifications();
/*
* The response received from the DFU device contains:
* +---------+--------+----------------------------------------------------+
* | byte no | value | description |
* +---------+--------+----------------------------------------------------+
* | 0 | 0x20 | Response code |
* | 1 | 0x01 | The Op Code of a request that this response is for |
* | 2 | STATUS | Status code |
* +---------+--------+----------------------------------------------------+
*/
int status = result.Data[2];
if (status != ButtonlessSwitchSuccessCode)
{
throw new Exception("Init status not correct " + status);
}
bool alreadyRestarted = false;
IDisposable dispose = null;
dispose = device.WhenStatusChanged().Subscribe(res =>
{
if (res == ConnectionStatus.Disconnected || res == ConnectionStatus.Disconnecting)
{
alreadyRestarted = true;
}
Debug.WriteLine("###################### STAT {0}", res);
});
dispose?.Dispose();
if (!alreadyRestarted)
{
await device.WhenDisconnected().Take(1).Timeout(DeviceRestartTimeout);
device.CancelConnection();
}
IDevice newDevice = await ScanDFUDevice(device, newName);
Debug.WriteLineIf(LogLevelDebug, String.Format("End of Buttonless switching"));
return(newDevice);
}
/// <summary>
/// Close connections, try to reenter standart mode, unsubscribe notifications
/// </summary>
/// <returns></returns>
private async Task Cleanup(IGattCharacteristic controlPoint, IDevice device)
{
await controlPoint.DisableNotifications();
device.CancelConnection();
}