public Task <bool> SubscribeCharacteristic(string serviceGUID, string characteristicGUID, string descriptorGUID)
{
subscribeCharacteristicTCS = new TaskCompletionSource <bool>();
try
{
if (_gatt == null)
{
Debug.WriteLine("Connect to Bluetooth Device first");
subscribeCharacteristicTCS.TrySetException(new Exception("Connect to Bluetooth Device first"));
}
BluetoothGattCharacteristic chara = _gatt.GetService(UUID.FromString(serviceGUID)).GetCharacteristic(UUID.FromString(characteristicGUID));
if (null == chara)
{
subscribeCharacteristicTCS.TrySetException(new Exception("Characteristic Id: " + characteristicGUID + " Not Found in Service: " + serviceGUID));
}
_gatt.SetCharacteristicNotification(chara, true);
BluetoothGattDescriptor descriptor = chara.GetDescriptor(UUID.FromString(descriptorGUID));
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
_gatt.WriteDescriptor(descriptor);
}
catch (Exception e)
{
Debug.WriteLine(e.Message);
subscribeCharacteristicTCS.TrySetException(new Exception(e.Message));
}
return(subscribeCharacteristicTCS.Task);
}
private void SetUpdateValue(bool enable)
{
var success = _gatt.SetCharacteristicNotification(_nativeCharacteristic, enable);
if (!success)
{
NotificationStateChanged?.Invoke(this, new CharacteristicNotificationStateEventArgs(this, false));
}
if (_nativeCharacteristic.Descriptors.Count > 0)
{
const string descriptorId = "00002902-0000-1000-8000-00805f9b34fb";
var value = enable ? BluetoothGattDescriptor.EnableNotificationValue : BluetoothGattDescriptor.DisableNotificationValue;
var descriptor = _nativeCharacteristic.Descriptors.FirstOrDefault(x => x.Uuid.ToString() == descriptorId);
if (descriptor != null && !descriptor.SetValue(value.ToArray()))
{
throw new Exception("Unable to set the notification value on the descriptor");
}
var dSuccess = _gatt.WriteDescriptor(descriptor);
if (!dSuccess)
{
//NotificationStateChanged?.Invoke(this, new CharacteristicNotificationStateEventArgs(this, false));
}
}
_isUpdating = enable;
}
private Boolean SetNotifyEnable(bool enable)
{
if (gatt == null || characteristic == null)
{
return(false);
}
bool isSuccess = gatt.SetCharacteristicNotification(characteristic, enable);
if (!isSuccess)
{
return(false);
}
BluetoothGattDescriptor descriptor = characteristic.GetDescriptor(UUID.FromString("00002902-0000-1000-8000-00805f9b34fb"));
byte[] value = new byte[BluetoothGattDescriptor.EnableNotificationValue.Count];
for (int i = 0; i < BluetoothGattDescriptor.EnableNotificationValue.Count; i++)
{
value[i] = BluetoothGattDescriptor.EnableNotificationValue[i];
}
descriptor.SetValue(value);
isSuccess = gatt.WriteDescriptor(descriptor);
return(isSuccess);
}
public override void OnServicesDiscovered(BluetoothGatt gatt, GattStatus status)
{
if (ValidateServices())
{
if (!gatt.SetCharacteristicNotification(readCharacteristic, true))
{
Log.E(this, "Failed to set rigado read characteristic to notify");
Disconnect();
return;
}
if (!readCharacteristicDescriptor.SetValue(new List <byte>(BluetoothGattDescriptor.EnableNotificationValue).ToArray()))
{
Log.E(this, "Failed to set notification to read descriptor");
Disconnect();
return;
}
if (!gatt.WriteDescriptor(readCharacteristicDescriptor))
{
Log.E(this, "Failed to write read notification descriptor");
Disconnect();
return;
}
}
}
public Task <bool> EnableNotificationAsync(IGattCharacteristic characteristic, CancellationToken token)
{
lock (_lock)
{
if (_bluetoothGatt == null || State != BluetoothLEDeviceState.Connected)
{
return(Task.FromResult(false));
}
var nativeCharacteristic = ((GattCharacteristic)characteristic).BluetoothGattCharacteristic;
if (!_bluetoothGatt.SetCharacteristicNotification(nativeCharacteristic, true))
{
return(Task.FromResult(false));
}
var descriptor = nativeCharacteristic.GetDescriptor(ClientCharacteristicConfigurationUUID);
if (descriptor == null)
{
return(Task.FromResult(false));
}
if (!descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray()))
{
return(Task.FromResult(false));
}
var result = _bluetoothGatt.WriteDescriptor(descriptor);
return(Task.FromResult(result));
}
}
/**
* Enables or disables notification on a give characteristic.
*
* @param characteristic Characteristic to act on.
* @param enabled If true, enable notification. False otherwise.
*/
internal void SetCharacteristicNotification(BluetoothGattCharacteristic characteristic, bool enabled)
{
if (bluetoothAdapter == null || bluetoothGatt == null)
{
logger.TraceWarning("BluetoothAdapter not initialized");
return;
}
if (characteristic.Uuid.Equals(UUID.FromString(SampleGattAttributes.PRESSURE_NOTIFICATION_HANDLE)))
{
bluetoothGatt.SetCharacteristicNotification(characteristic, enabled);
logger.TraceInformation("Setting notification: Pressure Characteristic detected ");
BluetoothGattDescriptor descriptor = characteristic.GetDescriptor(UUID.FromString("00002902-0000-1000-8000-00805F9B34FB"));
if (descriptor != null)
{
logger.TraceInformation("Setting notification: Pressure Descriptor Found");
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray <byte>());
bluetoothGatt.WriteDescriptor(descriptor);
logger.TraceInformation("Setting notification: Write Pressure Descriptor");
}
else
{
logger.TraceWarning("NOTIFICATION SET UP IGNORED");
}
}
}
private void PlatformSetNotification(bool enabled)
{
if (!_gatt.SetCharacteristicNotification(_characteristic, enabled))
{
RaiseSetNotificationFailed(BLEErrorCode.InternalError);
return;
}
using (var uuid = Java.Util.UUID.FromString(BLEConstants.CLIENT_CHARACTERISTIC_CONFIGURATION))
{
var descriptor = _characteristic.GetDescriptor(uuid);
if (!descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray()))
{
RaiseSetNotificationFailed(BLEErrorCode.InternalError);
return;
}
if (!_gatt.WriteDescriptor(descriptor))
{
RaiseSetNotificationFailed(BLEErrorCode.InternalError);
return;
}
}
PlatformIsNotifying = enabled;
RaiseNotificationSet();
}
public override void OnServicesDiscovered(BluetoothGatt gatt, GattStatus status)
{
if (ValidateServices())
{
var d = readCharacteristic.Descriptors[0];
if (!gatt.SetCharacteristicNotification(readCharacteristic, true))
{
Log.E(this, "Failed to set the read characteristic to notify.");
Disconnect();
return;
}
if (d.SetValue(new List <byte>(BluetoothGattDescriptor.EnableNotificationValue).ToArray()))
{
if (!gatt.WriteDescriptor(d))
{
Log.E(this, "Failed to set notification to read descriptor");
Disconnect();
return;
}
}
NotifyConnectionState();
vrcMeasurement = Units.Vacuum.MICRON.OfScalar(600000);
rigAngle = Units.Angle.DEGREE.OfScalar(90);
}
}
public override void OnCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic)
{
if (characteristic.Uuid.Equals(DT1WatchDogService.DT1WatchdogDataCharacteristicUUID))
{
log.Debug("Watchdog data characteristic changed.");
// we got data - fine we disconnect and wait for the next alarm
var CLIENT_CHARACTERISTIC_CONFIG = Java.Util.UUID.FromString("00002902-0000-1000-8000-00805f9b34fb");
var clientCharacteristiConfigDescriptor = characteristic.GetDescriptor(CLIENT_CHARACTERISTIC_CONFIG);
clientCharacteristiConfigDescriptor.SetValue(BluetoothGattDescriptor.DisableNotificationValue.ToArray());
gatt.WriteDescriptor(clientCharacteristiConfigDescriptor);
gatt.Disconnect();
var data = characteristic.GetValue();
var reading = GlucoseReading.ParseRawCharacteristicData(data);
// fill in source
reading.Source = gatt.Device.Name;
dataService.PersistReading(reading);
if (reading.ErrorCode == GlucoseReading.ReadingErrorCode.NoError)
{
dataService.LastValidReading = DateTimeOffset.UtcNow;
EvaluateReading(reading);
}
var dataIntent = new Intent(DT1WatchDogService.IntentIncommingData);
service.SendBroadcast(dataIntent);
}
}
private void EnableNotification()
{
_gatt.SetCharacteristicNotification(_characteristic, true);
var descriptor = _characteristic.GetDescriptor(UUID.FromString(NotifyDescriptorUuid));
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
_gatt.WriteDescriptor(descriptor);
}
//public void StartUpdates()
//{
// Task.Run(() =>
// {
// while (true)
// {
// if (!_gatt.SetCharacteristicNotification(_nativeCharacteristic, true))
// {
// // In order to subscribe to notifications on a given characteristic, you must first set the Notifications Enabled bit
// // in its Client Characteristic Configuration Descriptor. See https://developer.bluetooth.org/gatt/descriptors/Pages/DescriptorsHomePage.aspx and
// // https://developer.bluetooth.org/gatt/descriptors/Pages/DescriptorViewer.aspx?u=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml
// // for details.
// if (_nativeCharacteristic.Descriptors.Count > 0)
// {
// var descriptors = _nativeCharacteristic.Descriptors;
// var descriptor = descriptors[0];
// if (descriptor != null && Properties.HasFlag(CharacteristicPropertyType.Indicate))
// {
// if (!descriptor.SetValue(BluetoothGattDescriptor.EnableIndicationValue.ToArray()))
// {
// }
// if (!_gatt.WriteDescriptor(descriptor))
// {
// }
// }
// if (descriptor != null && Properties.HasFlag(CharacteristicPropertyType.Notify))
// {
// if (!descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray()))
// {
// }
// if (!_gatt.WriteDescriptor(descriptor))
// {
// }
// }
// break;
// }
// else
// {
// }
// }
// else
// {
// }
// Thread.Sleep(1000);
// }
// });
//}
public void StartUpdates()
{
Task.Run(() =>
{//on andorid this NEEDS to be in a different thread. when you await each command it stops it from responding and unblocking.
while (!_gatt.ReadCharacteristic(_nativeCharacteristic))
{
Thread.Sleep(100);
}
while (!_gatt.SetCharacteristicNotification(_nativeCharacteristic, true))
{
Thread.Sleep(100);
}
// [TO20131211@1634] It seems that setting the notification above isn't enough. You have to set the NOTIFY
// descriptor as well, otherwise the receiver will never get the updates. I just grabbed the first (and only)
// descriptor that is associated with the characteristic, which is the NOTIFY descriptor. This seems like a really
// odd way to do things to me, but I'm a Bluetooth newbie. Google has a example here (but no real explaination as
// to what is going on):
if (_nativeCharacteristic.Descriptors.Count > 0)
{
Thread.Sleep(100);
BluetoothGattDescriptor descriptor = _nativeCharacteristic.Descriptors[0];
while (!descriptor.SetValue(BluetoothGattDescriptor.EnableIndicationValue.ToArray()))
{
Console.WriteLine("Descriptor Setvalue loop");
Thread.Sleep(100);
}
while (!_gatt.WriteDescriptor(descriptor))
{
Console.WriteLine(" Write Descriptor loop");
Thread.Sleep(100);
}
Thread.Sleep(100);
while (!descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray()))
{
Console.WriteLine("Descriptor Setvalue loop");
Thread.Sleep(100);
}
while (!_gatt.WriteDescriptor(descriptor))
{
Console.WriteLine(" Write Descriptor loop");
Thread.Sleep(100);
}
}
});
}
private void SubscribeCharacteristic(BluetoothGattCharacteristic characteristic)
{
_gatt.SetCharacteristicNotification(characteristic, true);
var descriptor = characteristic.GetDescriptor(UUID.FromString("00002902-0000-1000-8000-00805f9b34fb"));
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
_gatt.WriteDescriptor(descriptor);
}
private void EnableGlucoseContextNotification(BluetoothGatt gatt)
{
if (_glucoseMeasurementContextCharacteristic != null)
{
gatt.SetCharacteristicNotification(_glucoseMeasurementContextCharacteristic, true);
BluetoothGattDescriptor descriptor =
_glucoseMeasurementContextCharacteristic.GetDescriptor(BLEHelpers.BLE_DESCRIPTOR);
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
gatt.WriteDescriptor(descriptor);
}
}
private void PlatformWrite(byte[] data)
{
if (!_descriptor.SetValue(data))
{
RaiseWriteFailed(BLEErrorCode.InternalError);
return;
}
if (!_gatt.WriteDescriptor(_descriptor))
{
RaiseWriteFailed(BLEErrorCode.InternalError);
}
}
private void EnableTimeSyncIndication(BluetoothGatt gatt)
{
if (_customTimeCharacteristic == null)
{
return;
}
gatt.SetCharacteristicNotification(_customTimeCharacteristic, true);
BluetoothGattDescriptor descriptor = _customTimeCharacteristic.GetDescriptor(BLEHelpers.BLE_DESCRIPTOR);
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
gatt.WriteDescriptor(descriptor);
}
private void EnableRecordAccessControlPointIndication(BluetoothGatt gatt)
{
if (_racpCharacteristic == null)
{
return;
}
gatt.SetCharacteristicNotification(_racpCharacteristic, true);
BluetoothGattDescriptor descriptor = _racpCharacteristic.GetDescriptor(BLEHelpers.BLE_DESCRIPTOR);
descriptor.SetValue(BluetoothGattDescriptor.EnableIndicationValue.ToArray());
gatt.WriteDescriptor(descriptor);
}
public void ConfigureGyroscopeNotification(BluetoothGatt gatt)
{
ConfigurationStep = ConfigurationStep.GyroscopeNotification;
var gyroscopeData = gatt.GetService(BluetoothSensorAttributes.GyroscopeService).GetCharacteristic(BluetoothSensorAttributes.GyroscopeData);
var gyroscopeNotification = gyroscopeData.GetDescriptor(BluetoothSensorAttributes.GyroscopeNotification);
gyroscopeNotification.SetValue(new byte[] { 1, 0 });
gatt.SetCharacteristicNotification(gyroscopeData, true);
gatt.WriteDescriptor(gyroscopeNotification);
}
public void ConfigureAccelerometerNotification(BluetoothGatt gatt)
{
ConfigurationStep = ConfigurationStep.AccelerometerNotification;
var accelerometerData = gatt.GetService(BluetoothSensorAttributes.AccelerometerService).GetCharacteristic(BluetoothSensorAttributes.AccelerometerData);
var accelerometerNotification = accelerometerData.GetDescriptor(BluetoothSensorAttributes.AccelerometerNotification);
accelerometerNotification.SetValue(new byte[] { 1, 0 });
gatt.SetCharacteristicNotification(accelerometerData, true);
gatt.WriteDescriptor(accelerometerNotification);
}
private void InternalWrite(byte[] data)
{
if (!_nativeDescriptor.SetValue(data))
{
throw new Exception("GATT: SET descriptor value failed");
}
if (!_gatt.WriteDescriptor(_nativeDescriptor))
{
throw new Exception("GATT: WRITE descriptor value failed");
}
}
public void StartUpdates()
{
// TODO: should be bool RequestValue? compare iOS API for commonality
var successful = false;
//if (CanRead)
//{
// Console.WriteLine("Characteristic.RequestValue, PropertyType = Read, requesting updates");
// successful = this._gatt.ReadCharacteristic(this._nativeCharacteristic);
//}
if (CanUpdate)
{
Console.WriteLine("Characteristic.RequestValue, PropertyType = Notify, requesting updates");
if (_gattCallback != null)
{
// wire up the characteristic value updating on the gattcallback for event forwarding
_gattCallback.CharacteristicValueUpdated += OnCharacteristicValueChanged;
}
successful = _gatt.SetCharacteristicNotification(_nativeCharacteristic, true);
// [TO20131211@1634] It seems that setting the notification above isn't enough. You have to set the NOTIFY
// descriptor as well, otherwise the receiver will never get the updates. I just grabbed the first (and only)
// descriptor that is associated with the characteristic, which is the NOTIFY descriptor. This seems like a really
// odd way to do things to me, but I'm a Bluetooth newbie. Google has a example here (but ono real explaination as
// to what is going on):
// http://developer.android.com/guide/topics/connectivity/bluetooth-le.html#notification
//
// HACK: further detail, in the Forms client this only seems to work with a breakpoint on it
// (ie. it probably needs to wait until the above 'SetCharacteristicNofication' is done before doing this...?????? [CD]
Thread.Sleep(100);
// HACK: did i mention this was a hack?????????? [CD] 50ms was too short, 100ms seems to work
if (_nativeCharacteristic.Descriptors.Count > 0)
{
var descriptor = _nativeCharacteristic.Descriptors[0];
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
successful &= _gatt.WriteDescriptor(descriptor);
}
else
{
Console.WriteLine("RequestValue, FAILED: _nativeCharacteristic.Descriptors was empty, not sure why");
}
}
Mvx.TaggedTrace("StartUpdates", "RequestValue, Succesful: {0}", successful);
}
private static void SetCharacteristicNotification_private(BluetoothGatt gatt, UUID serviceUuid, UUID characteristicUuid)
{
try {
BluetoothGattCharacteristic characteristic = gatt.GetService(serviceUuid).GetCharacteristic(characteristicUuid);
gatt.SetCharacteristicNotification(characteristic, true);
BluetoothGattDescriptor descriptor = characteristic.GetDescriptor(BLEHelpers.ClientCharacteristicConfig);
bool indication = (Convert.ToInt32(characteristic.Properties) & 32) != 0;
descriptor.SetValue(indication
? BluetoothGattDescriptor.EnableIndicationValue.ToArray()
: BluetoothGattDescriptor.EnableNotificationValue.ToArray());
gatt.WriteDescriptor(descriptor);
} catch (Exception e) {
Log.Error("BloodPressureGattCallbackerror", e.Message);
}
}
/// <summary>
///
/// </summary>
public virtual void EnableTXNotification()
{
if (m_Gatt == null)
{
Log.e("BleSerialPort", "No BluetoothGatt to EnableTXNotification!!!");
return;
}
// Get the service.
BluetoothGattService RxService = m_Gatt
.GetService(m_UuidServ);
if (RxService == null)
{
Log.e("BleSerialPort", "RxService==null");
return;
}
// Get the characteristic.
BluetoothGattCharacteristic txChar = RxService
.GetCharacteristic(m_UuidTx);
if (txChar == null)
{
Log.e("BleSerialPort", "txChar==null");
return;
}
// Set the characteristic notification.
bool result = m_Gatt.SetCharacteristicNotification(txChar, true);
if (!result)
{
Log.e("BleSerialPort", "m_Gatt.SetCharacteristicNotification(txChar,true) failed!!!");
}
// (Set the characteristic notification ???).
BluetoothGattDescriptor descriptor = txChar
.GetDescriptor(m_UuidCCCD);
descriptor.SetValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
m_Gatt.WriteDescriptor(descriptor);
Log.i("BleSerialPort", "EnableTXNotification successfully.");
}
protected override async void StartUpdatesNative()
{
// wire up the characteristic value updating on the gattcallback for event forwarding
_gattCallback.CharacteristicValueUpdated += OnCharacteristicValueChanged;
var successful = _gatt.SetCharacteristicNotification(_nativeCharacteristic, true);
// [TO20131211@1634] It seems that setting the notification above isn't enough. You have to set the NOTIFY
// descriptor as well, otherwise the receiver will never get the updates. I just grabbed the first (and only)
// descriptor that is associated with the characteristic, which is the NOTIFY descriptor. This seems like a really
// odd way to do things to me, but I'm a Bluetooth newbie. Google has a example here (but ono real explaination as
// to what is going on):
// http://developer.android.com/guide/topics/connectivity/bluetooth-le.html#notification
await Task.Delay(100);
//ToDo is this still needed?
// HACK: did i mention this was a hack?????????? [CD] 50ms was too short, 100ms seems to work
if (_nativeCharacteristic.Descriptors.Count > 0)
{
var descriptor = _nativeCharacteristic.Descriptors[0];
//has to have one of these (either indicate or notify)
if (Properties.HasFlag(CharacteristicPropertyType.Indicate))
{
descriptor.SetValue(BluetoothGattDescriptor.EnableIndicationValue.ToArray());
Trace.Message("Descriptor set value: INDICATE");
}
if (Properties.HasFlag(CharacteristicPropertyType.Notify))
{
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
Trace.Message("Descriptor set value: NOTIFY");
}
successful &= _gatt.WriteDescriptor(descriptor);
}
else
{
Trace.Message("Descriptor set value FAILED: _nativeCharacteristic.Descriptors was empty");
}
Trace.Message("Characteristic.StartUpdates, successful: {0}", successful);
}
/**
* Enables or disables notification on a give characteristic.
*
* @param characteristic Characteristic to act on.
* @param enabled If true, enable notification. False otherwise.
*/
public void SetCharacteristicNotification(BluetoothGattCharacteristic characteristic, bool enabled)
{
if (mBluetoothAdapter == null || mBluetoothGatt == null)
{
Log.Warn(TAG, "BluetoothAdapter not initialized");
return;
}
mBluetoothGatt.SetCharacteristicNotification(characteristic, enabled);
// This is specific to Heart Rate Measurement.
if (UUID_HEART_RATE_MEASUREMENT == characteristic.Uuid)
{
BluetoothGattDescriptor descriptor = characteristic.GetDescriptor(
UUID.FromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
mBluetoothGatt.WriteDescriptor(descriptor);
}
}
public void StartUpdates()
{
Console.WriteLine("Enabling indication/notification...");
BluetoothGattDescriptor descriptor = _nativeCharacteristic.GetDescriptor(UUID.FromString("00002902-0000-1000-8000-00805f9b34fb"));
Console.WriteLine("Descriptor UUID: " + descriptor.Uuid.ToString());
if ((_nativeCharacteristic.Properties & GattProperty.Indicate) == GattProperty.Indicate)
{
Console.WriteLine("Enabling indication");
descriptor.SetValue(BluetoothGattDescriptor.EnableIndicationValue.ToArray());
}
if ((_nativeCharacteristic.Properties & GattProperty.Notify) == GattProperty.Notify)
{
Console.WriteLine("Enabling notification");
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
}
_gatt.WriteDescriptor(descriptor);
}
private void ConfigureMovementData(BluetoothGatt gatt)
{
try
{
var characteristic = gatt.GetService(BluetoothSensorTagAttributes.MovementService).GetCharacteristic(BluetoothSensorTagAttributes.MovementData);
gatt.SetCharacteristicNotification(characteristic, true);
var descriptor = characteristic.GetDescriptor(BluetoothSensorTagAttributes.ClientConfigurationDescriptor);
descriptor.SetValue(new byte[] { 1, 0 });
gatt.WriteDescriptor(descriptor);
SensorTagConfigurationStep = SensorTagConfigurationStep.MovementData;
}
catch (System.Exception ex)
{
string title = this.GetType().Name + " - " + System.Reflection.MethodBase.GetCurrentMethod().Name;
BalizaFacil.App.Instance.UnhandledException(title, ex);
}
}
protected override async void StartUpdatesNative()
{
// wire up the characteristic value updating on the gattcallback for event forwarding
_gattCallback.CharacteristicValueUpdated += OnCharacteristicValueChanged;
var successful = _gatt.SetCharacteristicNotification(_nativeCharacteristic, true);
// In order to subscribe to notifications on a given characteristic, you must first set the Notifications Enabled bit
// in its Client Characteristic Configuration Descriptor. See https://developer.bluetooth.org/gatt/descriptors/Pages/DescriptorsHomePage.aspx and
// https://developer.bluetooth.org/gatt/descriptors/Pages/DescriptorViewer.aspx?u=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml
// for details.
await Task.Delay(100);
//ToDo is this still needed?
if (_nativeCharacteristic.Descriptors.Count > 0)
{
var descriptor = _nativeCharacteristic.Descriptors.FirstOrDefault(d => d.Uuid.Equals(_clientCharacteristicConfigurationDescriptorId)) ??
_nativeCharacteristic.Descriptors[0]; // fallback just in case manufacturer forgot
//has to have one of these (either indicate or notify)
if (Properties.HasFlag(CharacteristicPropertyType.Indicate))
{
descriptor.SetValue(BluetoothGattDescriptor.EnableIndicationValue.ToArray());
Trace.Message("Descriptor set value: INDICATE");
}
if (Properties.HasFlag(CharacteristicPropertyType.Notify))
{
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
Trace.Message("Descriptor set value: NOTIFY");
}
successful &= _gatt.WriteDescriptor(descriptor);
}
else
{
Trace.Message("Descriptor set value FAILED: _nativeCharacteristic.Descriptors was empty");
}
Trace.Message("Characteristic.StartUpdates, successful: {0}", successful);
}
public void SetCharacteristicNotification(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, string UUIDClient)
{
//Servizi trovati e compatibili
//Attiva richiesta notifiche
thread = new Thread(new ThreadStart(() =>
{
bool notificationState = false;
for (int i = 0; i < 3; i++)
{
gatt.SetCharacteristicNotification(characteristic, true);
BluetoothGattDescriptor descriptor = new BluetoothGattDescriptor(Java.Util.UUID.FromString(UUIDClient), GattDescriptorPermission.Write | GattDescriptorPermission.Read);
characteristic.AddDescriptor(descriptor);
descriptor.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray());
gatt.WriteDescriptor(descriptor);
/*
* BluetoothGattDescriptor desc = characteristic.GetDescriptor(UUID.FromString(UUIDClient));
* desc.SetValue(BluetoothGattDescriptor.EnableNotificationValue.ToArray<Byte>());
* gatt.WriteDescriptor(desc);
* gatt.SetCharacteristicNotification(characteristic, true);
*/
if (WaitCharRecive.WaitOne(5000))
{
notificationState = true;
if (Notification_Event != null)
{
Notification_Event(true);
}
break;
}
}
if (notificationState == false)
{
if (Notification_Event != null)
{
Notification_Event(false);
}
}
}));
thread.Start();
}
public override void OnServicesDiscovered(BluetoothGatt gatt, [GeneratedEnum] GattStatus status)
{
base.OnServicesDiscovered(gatt, status);
foreach (BluetoothGattService service in gatt.Services)
{
string uuid = service.Uuid.ToString().ToUpper();
if (uuid != "")
{
foreach (BluetoothGattCharacteristic characteristic in service.Characteristics)
{
string c_uuid = characteristic.Uuid.ToString().ToUpper();
if (c_uuid != "")
{
gatt.SetCharacteristicNotification(characteristic, true);
BluetoothGattDescriptor descriptor = new BluetoothGattDescriptor(UUID.FromString("00002A25-0000-1000-8000-00805F9B34FB"), GattDescriptorPermission.Read | GattDescriptorPermission.Write);
characteristic.AddDescriptor(descriptor);
gatt.SetCharacteristicNotification(characteristic, true);
gatt.ReadDescriptor(descriptor);
byte[] data = descriptor.GetValue();
descriptor.SetValue(data);
gatt.WriteDescriptor(descriptor);
byte[] chara = characteristic.GetValue();
if (data != null)
{
Log.Debug(tag, "VALOR AQUI: " + data.ToString());
Log.Debug(tag, "Chara: " + chara[0].ToString());
}
Log.Debug(tag, "Chara: " + chara[0].ToString());
Log.Debug(tag, "VALOR AQUI: " + data.ToString());
//Log.Debug(tag, "VALOR AQUI: " + data.ToString());
}
}
}
}
}
private void SetUpdateValue(bool enable)
{
if (!_gatt.SetCharacteristicNotification(_nativeCharacteristic, enable))
{
throw new Exception("Unable to set the notification value on the characteristic");
}
// hackity-hack-hack
System.Threading.Thread.Sleep(100);
if (_nativeCharacteristic.Descriptors.Count > 0)
{
const string descriptorId = "00002902-0000-1000-8000-00805f9b34fb";
var value = enable ? BluetoothGattDescriptor.EnableNotificationValue : BluetoothGattDescriptor.DisableNotificationValue;
var descriptor = _nativeCharacteristic.Descriptors.FirstOrDefault(x => x.Uuid.ToString() == descriptorId);
if (descriptor == null || !descriptor.SetValue(value.ToArray()) || !_gatt.WriteDescriptor(descriptor))
{
throw new Exception("Unable to set the notification value on the descriptor");
}
}
}