/// <summary>
/// Used for writing blobs
/// </summary>
/// <param name="ch">The characteristic to write on</param>
/// <param name="stream">The stream to send</param>
/// <param name="reliableWrite">Use reliable write atomic writing if available (windows and android)</param>
public static IObservable <BleWriteSegment> BlobWrite(this IGattCharacteristic ch, Stream stream, bool reliableWrite)
=> Observable.Create <BleWriteSegment>(async ob =>
{
var cts = new CancellationTokenSource();
var trans = reliableWrite
? ch.Service.Device.BeginReliableWriteTransaction()
: new VoidGattReliableWriteTransaction();
using (trans)
{
var mtu = ch.Service.Device.MtuSize;
var buffer = new byte[mtu];
var read = stream.Read(buffer, 0, buffer.Length);
var pos = read;
var len = Convert.ToInt32(stream.Length);
while (!cts.IsCancellationRequested && read > 0)
{
await trans
.Write(ch, buffer)
.ToTask(cts.Token)
.ConfigureAwait(false);
//if (this.Value != buffer)
//{
// trans.Abort();
// throw new GattReliableWriteTransactionException("There was a mismatch response");
//}
var seg = new BleWriteSegment(buffer, pos, len);
ob.OnNext(seg);
read = stream.Read(buffer, 0, buffer.Length);
if (read > 0 && read < buffer.Length)
{
for (var index = read; index < buffer.Length; index++)
{
buffer[index] = 0;
}
}
pos += read;
}
await trans.Commit();
}
ob.OnCompleted();
return(() =>
{
cts.Cancel();
trans.Dispose();
});
});
public WriteRequest(IGattCharacteristic characteristic,
IPeripheral peripheral,
byte[] data,
int offset,
bool isReplyNeeded)
{
this.Characteristic = characteristic;
this.Peripheral = peripheral;
this.Offset = offset;
this.IsReplyNeeded = isReplyNeeded;
this.Data = data;
}
public static void AssertWrite(this IGattCharacteristic characteristic, bool withResponse)
{
if (!characteristic.CanWrite())
{
throw new ArgumentException($"This characteristic '{characteristic.Uuid}' does not support writes");
}
if (withResponse && !characteristic.CanWriteWithResponse())
{
throw new ArgumentException($"This characteristic '{characteristic.Uuid}' does not support writes with response");
}
}
public static IObservable <byte[]> ReadInterval(this IGattCharacteristic character, TimeSpan timeSpan)
{
return(Observable.Create <byte[]>(ob =>
Observable
.Interval(timeSpan)
.Subscribe(async _ =>
{
var read = await character.Read();
ob.OnNext(read);
})
));
}
public override IObservable <GattCharacteristicResult> Write(IGattCharacteristic characteristic, byte[] value)
{
this.AssertAction();
if (!(characteristic is GattCharacteristic platform))
{
throw new ArgumentException("Characteristic must be UWP type");
}
this.native.WriteValue(platform.Native, value.AsBuffer());
return(Observable.Return(new GattCharacteristicResult(characteristic, value, GattCharacteristicResultType.Write)));
}
public override IObservable <CharacteristicGattResult> Write(IGattCharacteristic characteristic, byte[] value)
{
this.AssertAction();
if (!(characteristic is GattCharacteristic platform))
{
throw new ArgumentException("Characteristic must be UWP type");
}
// TODO: need write observable
this.native.WriteValue(platform.Native, null);
return(null);
}
protected override async Task <bool> ValidateServicesAsync(IEnumerable <IGattService> services, CancellationToken token)
{
var service = services?.FirstOrDefault(s => s.Uuid == SERVICE_UUID);
_characteristic = service?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID);
if (_characteristic != null)
{
return(await _bleDevice?.EnableNotificationAsync(_characteristic, token));
}
return(false);
}
protected override Task <bool> ValidateServicesAsync(IEnumerable <IGattService> services, CancellationToken token)
{
var service = services?.FirstOrDefault(s => s.Uuid == SERVICE_UUID);
_characteristic = service?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID);
var deviceInformationService = services?.FirstOrDefault(s => s.Uuid == SERVICE_UUID_DEVICE_INFORMATION);
_firmwareRevisionCharacteristic = deviceInformationService?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID_FIRMWARE_REVISION);
_modelNumberCharacteristic = deviceInformationService?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID_MODEL_NUMBER);
return(Task.FromResult(_characteristic != null && _firmwareRevisionCharacteristic != null && _modelNumberCharacteristic != null));
}
public bool WriteNoResponse(IGattCharacteristic characteristic, byte[] data)
{
if (State != BluetoothLEDeviceState.Connected)
{
return(false);
}
var nativeCharacteristic = ((GattCharacteristic)characteristic).Characteristic;
var nativeData = NSData.FromArray(data);
_peripheral.WriteValue(nativeData, nativeCharacteristic, CBCharacteristicWriteType.WithoutResponse);
return(true);
}
private static async Task SendChallengeResponse(IGattCharacteristic authCharacteristic, byte[] challenge)
{
var challengePayload = new byte[ChallengePayloadLength];
Buffer.BlockCopy(challenge, ChallengeHeaderLength, challengePayload, 0, challengePayload.Length);
var responsePayload = Encrypt(StaticEncryptionKey, challengePayload);
var responseHeader = new byte[] { 0x03, 0x00 };
var response = new byte[responseHeader.Length + responsePayload.Length];
Buffer.BlockCopy(responseHeader, 0, response, 0, responseHeader.Length);
Buffer.BlockCopy(responsePayload, 0, response, responseHeader.Length, responsePayload.Length);
await authCharacteristic.WriteWithoutResponse(response);
}
/// <summary>
/// Called when a new characteristic is discovered
/// </summary>
/// <param name="characteristic">The characteristic</param>
private void OnCharacteristicDiscovered(IGattCharacteristic characteristic)
{
var id = characteristic.Uuid;
if (id == Constants.ImageCharacteristic)
{
this.imageCharacteristic = characteristic;
this.NotifyCanSendImages?.Invoke();
}
else if (id == Constants.ImageReceivedCharacteristic)
{
this.imageReceivedCharacteristic = characteristic;
}
}
public static IObservable <byte[]> WhenReadOrNotify(this IGattCharacteristic character, TimeSpan readInterval)
{
if (character.CanNotify())
{
return(character.SubscribeToNotifications());
}
if (character.CanRead())
{
return(character.ReadInterval(readInterval));
}
throw new ArgumentException($"Characteristic {character.Uuid} does not have read or notify permissions");
}
public override IObservable <CharacteristicResult> Write(IGattCharacteristic characteristic, byte[] value)
{
this.AssertAction();
var platform = characteristic as GattCharacteristic;
if (platform == null)
{
throw new ArgumentException("");
}
// TODO: need write observable
this.native.WriteValue(platform.Native, null);
return(null);
}
private async Task <IGattCharacteristic> GetGattCharacteristicAsync(Tuple <Guid, Guid> gattChar)
{
IGattCharacteristic characteristic = null;
if (gattChar.Item1 == MbientLab.MetaWear.Constants.METAWEAR_GATT_SERVICE && _advertisementCharacteristics != null)
{
characteristic = _advertisementCharacteristics.FirstOrDefault(x => x.Uuid == gattChar.Item2);
}
else
{
characteristic = await device.GetKnownCharacteristics(gattChar.Item1, gattChar.Item2).FirstAsync();
}
return(characteristic);
}
public Task <bool> WriteNoResponseAsync(IGattCharacteristic characteristic, byte[] data, CancellationToken token)
{
lock (_lock)
{
if (State != BluetoothLEDeviceState.Connected)
{
return(Task.FromResult(false));
}
var nativeCharacteristic = ((GattCharacteristic)characteristic).Characteristic;
var nativeData = NSData.FromArray(data);
_peripheral.WriteValue(nativeData, nativeCharacteristic, CBCharacteristicWriteType.WithoutResponse);
return(Task.FromResult(true));
}
}
/// <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
)
)
);
protected override Task <bool> ValidateServicesAsync(IEnumerable <IGattService> services, CancellationToken token)
{
var deviceInformationService = services?.FirstOrDefault(s => s.Uuid == SERVICE_UUID_DEVICE_INFORMATION);
_firmwareRevisionCharacteristic = deviceInformationService?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID_FIRMWARE_REVISION);
_hardwareRevisionCharacteristic = deviceInformationService?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID_HARDWARE_REVISION);
var remoteControlService = services?.FirstOrDefault(s => s.Uuid == SERVICE_UUID_REMOTE_CONTROL);
_remoteControlCharacteristic = remoteControlService?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID_REMOTE_CONTROL);
_quickDriveCharacteristic = remoteControlService?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID_QUICK_DRIVE);
return(Task.FromResult(
_firmwareRevisionCharacteristic != null &&
_hardwareRevisionCharacteristic != null &&
_remoteControlCharacteristic != null &&
_quickDriveCharacteristic != null));
}
public static IObservable <CharacteristicResult> WhenReadOrNotify(this IGattCharacteristic character, TimeSpan readInterval)
{
if (character.CanNotify())
{
return(character
.EnableNotifications()
.Where(x => x)
.Select(x => character.WhenNotificationReceived())
.Switch());
}
if (character.CanRead())
{
return(character.ReadInterval(readInterval));
}
throw new ArgumentException($"Characteristic {character.Uuid} does not have read or notify permissions");
}
/// <summary>
/// Write bytes through communication interface
/// </summary>
public override void WriteBytes(byte[] buffer, int offset, int count)
{
if (_bleDevice == null)
{
throw new ArgumentNullException("_bleDevice");
}
_cmdTx = buffer[2];
int loopCnt = 0;
while (loopCnt <= _maxAutoRetries)
{
loopCnt++;
try
{
IGattCharacteristic characteristic = _bleDevice.GetCharacteristicsForService(ServiceUuid)
.FirstOrDefaultAsync(x => x.Uuid == TxCharacteristicUuid).Wait();
if (null != characteristic)
{
Stopwatch watch = Stopwatch.StartNew();
characteristic.WriteWithoutResponse(buffer).Wait();
watch.Stop();
_stopWatch.Restart();
lock (_lockDebugInfo)
{
if (_writeTimeMs.Count >= 1000)
{
_writeTimeMs.RemoveAt(0);
}
_writeTimeMs.Add(watch.ElapsedMilliseconds);
}
break;
}
}
catch (Exception)
{
Thread.Sleep(75);
}
}
}
protected override async Task <bool> ValidateServicesAsync(IEnumerable <IGattService> services, CancellationToken token)
{
var service = services?.FirstOrDefault(s => s.Uuid == SERVICE_UUID);
_writeCharacteristic = service?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID_WRITE);
var deviceInformationService = services?.FirstOrDefault(s => s.Uuid == SERVICE_UUID_DEVICE_INFORMATION);
_firmwareRevisionCharacteristic = deviceInformationService?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID_FIRMWARE_REVISION);
_hardwareRevisionCharacteristic = deviceInformationService?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID_HARDWARE_REVISION);
_notifyCharacteristic = service?.Characteristics?.FirstOrDefault(c => c.Uuid == CHARACTERISTIC_UUID_NOTIFY);
if (_notifyCharacteristic != null)
{
await _bleDevice?.EnableNotificationAsync(_notifyCharacteristic, token);
}
return(_writeCharacteristic != null && _firmwareRevisionCharacteristic != null && _hardwareRevisionCharacteristic != null);
}
public void ConnectPrinter(IPeripheral selectedPeripheral)
{
if (!selectedPeripheral.IsConnected())
{
selectedPeripheral.Connect();
}
_perifDisposable = selectedPeripheral.WhenAnyCharacteristicDiscovered().Subscribe((characteristic) =>
{
if (characteristic.CanWrite() && !characteristic.CanRead() && !characteristic.CanNotify())
{
_savedCharacteristic = characteristic;
IsReady = true;
_perifDisposable.Dispose();
}
});
}
public void Disconnect()
{
if (ConnectState != DeviceState.Disconnecting || ConnectState != DeviceState.Disconnected)
{
try
{
readCharacteristicObserver?.Dispose();
}
catch (Exception e)
{
// Crashes.TrackError(e);
}
try
{
chararacteristicListener?.Dispose();
}
catch (Exception e)
{
// Crashes.TrackError(e);
}
try
{
stateListener?.Dispose();
}
catch (Exception e)
{
// Crashes.TrackError(e);
}
try
{
device.CancelConnection();
}
catch (Exception e)
{
// Crashes.TrackError(e);
}
readCharacteristic = null;
writeCharacteristic = null;
}
}
/// <summary>
/// Set Packet Receipt Notification (PRN) value.
/// Sets the number of packets to be sent before receiving a Packet Receipt Notification. The default is 0.
/// </summary>
/// <param name="device"></param>
/// <param name="prn"></param>
/// <returns></returns>
private async Task SetPRN(IGattCharacteristic controlPoint, int prn)
{
// PRN value should be LSB
byte[] data = new byte[] {
CSetPRN,
0,
0
};
SetUint16LSB(data, 1, prn);
var notif = GetTimedNotification(controlPoint);
await controlPoint.Write(data).Timeout(OperationTimeout);
var result = await notif.Task;
Debug.WriteLineIf(LogLevelDebug, String.Format("Received PRN set response: {0}", BitConverter.ToString(result.Data)));
AssertSuccess(result);
}
private void Button_ScanService(object sender, RoutedEventArgs e)
{
currdev.DiscoverServices().Subscribe(mService =>
{
IGattService findServ = mService;
findServ.DiscoverCharacteristics().Subscribe(mCharacter =>
{
Debug.WriteLine("FindCharacter OK:" + mCharacter.Uuid);
if (mCharacter.Uuid == (new Guid("48EB9002-F352-5FA0-9B06-8FCAA22602CF")))
{
Debug.WriteLine("找到了 OK:");
FindCharacter = mCharacter;
}
}
);
//Debug.WriteLine("mService OK");
});
}
public async Task <bool> WriteAsync(IGattCharacteristic characteristic, byte[] data, CancellationToken token)
{
using (token.Register(() =>
{
lock (_lock)
{
_writeCompletionSource?.TrySetResult(false);
}
}))
{
lock (_lock)
{
if (_bluetoothGatt == null || State != BluetoothLEDeviceState.Connected)
{
return(false);
}
var nativeCharacteristic = ((GattCharacteristic)characteristic).BluetoothGattCharacteristic;
nativeCharacteristic.WriteType = GattWriteType.Default;
if (!nativeCharacteristic.SetValue(data))
{
return(false);
}
_writeCompletionSource = new TaskCompletionSource <bool>(TaskCreationOptions.RunContinuationsAsynchronously);
if (!_bluetoothGatt.WriteCharacteristic(nativeCharacteristic))
{
_writeCompletionSource = null;
return(false);
}
}
var result = await _writeCompletionSource.Task.ConfigureAwait(false);
lock (_lock)
{
_writeCompletionSource = null;
return(result);
}
}
}
public Device(Plugin.BluetoothLE.IDevice dev)
{
device = dev;
Name = dev.Name;
chararacteristicListener = device.WhenAnyCharacteristicDiscovered().Subscribe(characteristic =>
{
if (characteristic.Uuid.ToString() == BleService.CharacteristictReadUuid)
{
readCharacteristic = characteristic;
OnStateChanged(DeviceState.Connected);
RaisePropertyChanged(nameof(ConnectState));
if (readCharacteristic.CanNotify())
{
readCharacteristicObserver = characteristic.RegisterAndNotify(true).Subscribe(r =>
{
Read?.Invoke(r.Data);
},
exception =>
{
// Crashes.TrackError(exception);
});
}
}
if (characteristic.Uuid.ToString() == BleService.CharacteristicWriteUuid)
{
if (characteristic.CanWrite())
{
writeCharacteristic = characteristic;
OnStateChanged(DeviceState.Connected);
RaisePropertyChanged(nameof(ConnectState));
}
}
}, exception =>
{
// Crashes.TrackError(exception);
});
stateListener = device.WhenStatusChanged().Subscribe(f =>
{
OnStateChanged(ConnectState);
});
}
public static IObservable <BleWriteSegment> WriteBlobTransaction(this IGattCharacteristic ch, Stream stream) => Observable.Create <BleWriteSegment>(async(ob, ct) =>
{
var trans = ch.Service.Peripheral.TryBeginTransaction();
using (trans)
{
var mtu = ch.Service.Peripheral.MtuSize;
var buffer = new byte[mtu];
var read = stream.Read(buffer, 0, buffer.Length);
var pos = read;
var len = Convert.ToInt32(stream.Length);
var remaining = 0;
while (!ct.IsCancellationRequested && read > 0)
{
await trans
.Write(ch, buffer)
.ToTask(ct)
.ConfigureAwait(false);
//if (this.Value != buffer)
//{
// trans.Abort();
// throw new GattReliableWriteTransactionException("There was a mismatch response");
//}
var seg = new BleWriteSegment(buffer, pos, len);
ob.OnNext(seg);
remaining = len - pos;
if (remaining > 0 && remaining < mtu)
{
// readjust buffer -- we don't want to send extra garbage
buffer = new byte[remaining];
}
read = stream.Read(buffer, 0, buffer.Length);
pos += read;
}
await trans.Commit();
}
ob.OnCompleted();
return(trans);
});
void ConnectPrinter(IPeripheral selectedPeripheral)
{
if (!selectedPeripheral.IsConnected())
{
selectedPeripheral.Connect();
}
_perifDisposable = selectedPeripheral.WhenAnyCharacteristicDiscovered().Subscribe((characteristic) =>
{
//System.Diagnostics.Debug.WriteLine(characteristic.Description); //this is not suppported at this momment, and no neccesary I guess
if (characteristic.CanWrite() && !characteristic.CanRead() && !characteristic.CanNotify())
{
IsReadyToPrint = true;
_savedCharacteristic = characteristic;
System.Diagnostics.Debug.WriteLine($"Writing {characteristic.Uuid} - {characteristic.CanRead()} - {characteristic.CanIndicate()} - {characteristic.CanNotify()}");
_perifDisposable.Dispose();
}
});
}
/// <summary>
/// Request and read DFU checksum from control point after data have been sent
/// </summary>
/// <param name="device"></param>
/// <returns></returns>
private async Task <ObjectChecksum> ReadChecksum(IGattCharacteristic controlPoint)
{
Debug.WriteLineIf(LogLevelDebug, String.Format("Begin read checksum"));
ObjectChecksum checksum = new ObjectChecksum();
CharacteristicGattResult result = null;
for (var retry = 0; retry < MaxRetries; retry++)
{
try
{
// Request checksum
var notif = GetTimedNotification(controlPoint);
var re = await controlPoint.Write(CCalculateCRC).Timeout(OperationTimeout);
Debug.WriteLine(re);
result = await notif.Task;
break;
}
catch (Exception)
{
await Task.Delay(100);
}
finally
{
if (retry == MaxRetries)
{
throw new DFUTimeout();
}
}
}
Debug.WriteLineIf(LogLevelDebug, String.Format("Check Sum Response {0}", BitConverter.ToString(result.Data)));
AssertSuccess(result);
SetChecksum(checksum, result.Data);
Debug.WriteLineIf(LogLevelDebug, String.Format("End read checksum"));
return(checksum);
}
private void ListView_ItemTapped(object sender, ItemTappedEventArgs e)
{
var select = (CharacteristicsList)e.Item;
foreach (var c in AllCharacteristics)
{
if (c.Uuid == select.Uuid)
{
SelectCharacteristic = c;
info_uuid.Text = "UUID:" + SelectCharacteristic.Uuid;
info_read.Text = "CallBack UUID:";
notify_btn.Text = "Notify";
if (SelectCharacteristic.CanRead())
{
read_btn.IsVisible = true;
}
else
{
read_btn.IsVisible = false;
}
if (SelectCharacteristic.CanWrite())
{
write_btn.IsVisible = true;
}
else
{
write_btn.IsVisible = false;
}
if (SelectCharacteristic.CanNotify())
{
notify_btn.IsVisible = true;
}
else
{
notify_btn.IsVisible = false;
}
background.IsVisible = true;
info.IsVisible = true;
break;
}
}
}
