Java Code Examples for android.bluetooth.BluetoothGatt#readCharacteristic()

@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
    Log.d(TAG, "characteristic wrote " + status);
    if (status == BluetoothGatt.GATT_SUCCESS) {
        Log.d(TAG, "Wrote a characteristic successfully " + characteristic.getUuid());
        if (mAuthenticationCharacteristic.getUuid().equals(characteristic.getUuid())) {
            state_authSucess = true;
            gatt.readCharacteristic(mHeartBeatCharacteristic);
        }
    } else if ((status & BluetoothGatt.GATT_INSUFFICIENT_AUTHENTICATION) != 0 || (status & BluetoothGatt.GATT_INSUFFICIENT_ENCRYPTION) != 0) {
        if (gatt.getDevice().getBondState() == BluetoothDevice.BOND_NONE) {
            device = gatt.getDevice();
            state_authInProgress = true;
            bondDevice();
        } else {
            Log.e(TAG, "The phone is trying to read from paired device without encryption. Android Bug? Have the dexcom forget whatever device it was previously paired to: oncharacteristicwrite code: "+status+ "bond: "+gatt.getDevice().getBondState());
        }
    } else {
        Log.e(TAG, "Unknown error writing Characteristic");
    }
}
 

public void start(BluetoothGatt bluetoothGatt) {
    switch (requestType) {
        case READ_CHARACTERISTIC:
            if (!bluetoothGatt.readCharacteristic(characteristic)) {
                throw new IllegalArgumentException("Characteristic is not valid: " + characteristic.getUuid().toString());
            }
            break;
        case READ_DESCRIPTOR:
            if (!bluetoothGatt.readDescriptor(descriptor)) {
                throw new IllegalArgumentException("Descriptor is not valid");
            }
            break;
        case WRITE_CHARACTERISTIC:
            if (!bluetoothGatt.writeCharacteristic(characteristic)) {
                throw new IllegalArgumentException("Characteristic is not valid");
            }
            break;
        case WRITE_DESCRIPTOR:
            if (!bluetoothGatt.writeDescriptor(descriptor)) {
                throw new IllegalArgumentException("Characteristic is not valid");
            }
            break;
    }
}
 

@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic,
    int status) {
  // Make sure the site is running.  It can stop if the dialog is dismissed very quickly.
  if (!isRunning()) {
    close();
    return;
  }

  // Make sure the read was successful.
  if (status != BluetoothGatt.GATT_SUCCESS) {
    Log.i(TAG, "onCharacteristicRead unsuccessful: " + status);
    close();
    Toast.makeText(activity, R.string.ble_download_error_message, Toast.LENGTH_SHORT).show();
    return;
  }

  // Record the data.
  Log.i(TAG, "onCharacteristicRead successful");
  try {
    mHtml.write(characteristic.getValue());
  } catch (IOException e) {
    Log.e(TAG, "Could not write to buffer", e);
    close();
    return;
  }

  // Request a new read if we are not done.
  if (characteristic.getValue().length == transferRate) {
    gatt.readCharacteristic(this.characteristic);
    return;
  }

  // At this point we are done.  Show the file.
  Log.i(TAG, "transfer is complete");
  close();
  openInChrome(getHtmlFile());
}
 

@Override
public void onExecute(@NonNull BluetoothGatt gatt) {
    BluetoothGattCharacteristic c = extractCharacteristic(gatt);
    if (c == null) {
        postOnNotFound(ErrorStrings.NO_CHARACTERISTIC + ": " + this.characteristic.toString());
        return;
    }

    if (!gatt.readCharacteristic(c)) {
        postOnError(ErrorStrings.WRITE_OP_INIT_FAIL);
    }
}
 

@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
    if (status == BluetoothGatt.GATT_SUCCESS) {
        Log.v(TAG, "Characteristic Read " + characteristic.getUuid());
        if(mHeartBeatCharacteristic.getUuid().equals(characteristic.getUuid())) {
            Log.v(TAG, "Characteristic Read " + characteristic.getUuid() + " " + characteristic.getValue());
            setCharacteristicNotification(mHeartBeatCharacteristic);
        }
        gatt.readCharacteristic(mHeartBeatCharacteristic);
    } else {
        Log.e(TAG, "Characteristic failed to read");
    }
}
 

@Override
public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
    Timber.i( "onDescriptorWrite: " + status + ",descriptor=" + descriptor.getUuid().toString() +
            ",descriptor_characteristic=" + descriptor.getCharacteristic().getUuid().toString());

    if (isGemini && descriptor.getCharacteristic().getUuid().toString().equals(OWDevice.OnewheelCharacteristicUartSerialRead)) {
        Timber.d("Stability Step 3: if isGemini and the characteristic descriptor that was written was Serial Write" +
                "then trigger the 20 byte input key over multiple serial ble notification stream by writing the firmware version onto itself");
        gatt.writeCharacteristic(owGatService.getCharacteristic(UUID.fromString(OWDevice.OnewheelCharacteristicFirmwareRevision)));
    }

    //DeviceCharacteristic dc = mOWDevice.characteristics.get(descriptor.getCharacteristic().getUuid().toString());
    //if (dc != null && (dc.state == 0 || dc.state == 1)) {
    //    gatt.setCharacteristicNotification(  owGatService.getCharacteristic(UUID.fromString(dc.uuid.get())), true);
    //
    // }

    if (descriptorWriteQueue.size() > 0) {
        descriptorWriteQueue.remove();
        if (descriptorWriteQueue.size() > 0) {
            gatt.writeDescriptor(descriptorWriteQueue.element());
        } else if (characteristicReadQueue.size() > 0) {
            gatt.readCharacteristic(characteristicReadQueue.element());
        }
    }

    // Step 3: In OnDescriptorWrite, if isGemini and the characteristic descriptor that was
    // written was Serial Write, then trigger the byte stream by writing the firmware version
    // onto itself.
    /*
    if (isGemini && (descriptor.equals(OWDevice.OnewheelCharacteristicUartSerialWrite))) {
        Timber.d("Step 3: Is Gemini, writing the descriptor onto itself");
        gatt.writeDescriptor(descriptor);
    }
    */
}
 

@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
    super.onServicesDiscovered(gatt, status);
    boolean startNotificationForCharacteristicFromHere = true;
    List<BluetoothGattService> services = gatt.getServices();
    if (services != null) {
        for (BluetoothGattService s : services) {
            if (s.getCharacteristics() != null) {
                for (BluetoothGattCharacteristic ch : s.getCharacteristics()) {
                    if (GattCharacteristic.TemperatureType.uuid.equals(ch.getUuid())) {
                        startNotificationForCharacteristicFromHere = false;
                        gatt.readCharacteristic(ch);
                        break;
                    }

                }
            }
        }
    }

    if (startNotificationForCharacteristicFromHere) {
        BLEUtils.SetNotificationForCharacteristic(gatt, GattService.HealthThermometer,
                GattCharacteristic.Temperature,
                BLEUtils.Notifications.INDICATE);
    }

}
 

private boolean internalReadCharacteristic(@Nullable final BluetoothGattCharacteristic characteristic) {
	final BluetoothGatt gatt = bluetoothGatt;
	if (gatt == null || characteristic == null || !connected)
		return false;

	// Check characteristic property.
	final int properties = characteristic.getProperties();
	if ((properties & BluetoothGattCharacteristic.PROPERTY_READ) == 0)
		return false;

	log(Log.VERBOSE, "Reading characteristic " + characteristic.getUuid());
	log(Log.DEBUG, "gatt.readCharacteristic(" + characteristic.getUuid() + ")");
	return gatt.readCharacteristic(characteristic);
}
 

@Override
public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
    if (DESCRIPTOR_CONFIG.equals(descriptor.getUuid())) {
        BluetoothGattCharacteristic characteristic = gatt.getService(SERVICE_UUID).getCharacteristic(CHARACTERISTIC_COUNTER_UUID);
        gatt.readCharacteristic(characteristic);
    }
}
 

private void readNext(BluetoothGatt gatt) {
    BluetoothGattCharacteristic characteristic = queue.poll();
    if (characteristic == null) {
        finish(CommandResult.createEmptySuccess(null));
        return;
    }
    if (!gatt.readCharacteristic(characteristic)) {
        finish(CommandResult.createErrorResult(null, BluetoothGatt.GATT_FAILURE));
    }
}
 

@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
    if (status == BluetoothGatt.GATT_SUCCESS) {
        Log.v(TAG, "Characteristic Read " + characteristic.getUuid());
        if(mHeartBeatCharacteristic.getUuid().equals(characteristic.getUuid())) {
            Log.v(TAG, "Characteristic Read " + characteristic.getUuid() + " " + characteristic.getValue());
            setCharacteristicNotification(mHeartBeatCharacteristic);
        }
        gatt.readCharacteristic(mHeartBeatCharacteristic);
    } else {
        Log.e(TAG, "Characteristic failed to read");
    }
}
 

public static boolean readCharacteristic(BluetoothGatt gatt, UUID serviceUuid, UUID characteristicUuid) {
    if (gatt == null) {
        return false;
    }
    BluetoothGattService service = gatt.getService(serviceUuid);
    if (service == null) {
        return false;
    }
    BluetoothGattCharacteristic characteristic = service.getCharacteristic(characteristicUuid);
    if (characteristic == null) {
        return false;
    }
    return gatt.readCharacteristic(characteristic);
}
 

public boolean readCharacteristic(String address,
		BleGattCharacteristic characteristic) {
	BluetoothGatt gatt = mBluetoothGatts.get(address);
	if (gatt == null) {
		return false;
	}

	return gatt.readCharacteristic(characteristic.getGattCharacteristicA());
}
 

@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
    if (status == BluetoothGatt.GATT_SUCCESS) {
        Log.v(TAG, "Characteristic Read " + characteristic.getUuid());
        if(mHeartBeatCharacteristic.getUuid().equals(characteristic.getUuid())) {
            Log.v(TAG, "Characteristic Read " + characteristic.getUuid() + " " + characteristic.getValue());
            setCharacteristicNotification(mHeartBeatCharacteristic);
        }
        gatt.readCharacteristic(mHeartBeatCharacteristic);
    } else {
        Log.e(TAG, "Characteristic failed to read");
    }
}
 

void readValue(String address, BluetoothGattCharacteristic theCharacteristic) {
  BluetoothGatt bluetoothGatt = addressToGattClient.get(address);
  if (bluetoothGatt == null) {
    Log.w(TAG, "No connection found for: " + address);
    sendGattBroadcast(address, BleEvents.READ_CHAR_FAIL, null);
    return;
  }
  bluetoothGatt.readCharacteristic(theCharacteristic);
}
 

@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
    super.onServicesDiscovered(gatt, status);
    // Notify connection failure if service discovery failed.
    if (status == BluetoothGatt.GATT_FAILURE) {
        connectFailure();
        return;
    }

    // Save reference to each UART characteristic.
    tx = gatt.getService(UART_UUID).getCharacteristic(TX_UUID);
    rx = gatt.getService(UART_UUID).getCharacteristic(RX_UUID);

    // Save reference to each DIS characteristic.
    disManuf = gatt.getService(DIS_UUID).getCharacteristic(DIS_MANUF_UUID);
    disModel = gatt.getService(DIS_UUID).getCharacteristic(DIS_MODEL_UUID);
    disHWRev = gatt.getService(DIS_UUID).getCharacteristic(DIS_HWREV_UUID);
    disSWRev = gatt.getService(DIS_UUID).getCharacteristic(DIS_SWREV_UUID);

    // Add device information characteristics to the read queue
    // These need to be queued because we have to wait for the response to the first
    // read request before a second one can be processed (which makes you wonder why they
    // implemented this with async logic to begin with???)
    readQueue.offer(disManuf);
    readQueue.offer(disModel);
    readQueue.offer(disHWRev);
    readQueue.offer(disSWRev);

    // Request a dummy read to get the device information queue going
    gatt.readCharacteristic(disManuf);

    // Setup notifications on RX characteristic changes (i.e. data received).
    // First call setCharacteristicNotification to enable notification.
    if (!gatt.setCharacteristicNotification(rx, true)) {
        // Stop if the characteristic notification setup failed.
        connectFailure();
        return;
    }
    // Next update the RX characteristic's client descriptor to enable notifications.
    BluetoothGattDescriptor desc = rx.getDescriptor(CLIENT_UUID);
    if (desc == null) {
        // Stop if the RX characteristic has no client descriptor.
        connectFailure();
        return;
    }
    desc.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
    if (!gatt.writeDescriptor(desc)) {
        // Stop if the client descriptor could not be written.
        connectFailure();
        return;
    }
    // Notify of connection completion.
    notifyOnConnected(this);
}
 

@Override
protected boolean startOperation(BluetoothGatt bluetoothGatt) {
    return bluetoothGatt.readCharacteristic(bluetoothGattCharacteristic);
}
 

@Override
// New services discovered
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
    MLog.d(TAG, "onServicesDiscovered " + gatt + " " + status);
    ReturnObject ret = new ReturnObject();

    if (status == BluetoothGatt.GATT_SUCCESS) {
        List<BluetoothGattService> services = gatt.getServices();
        PhonkNativeArray retServicesArray = new PhonkNativeArray(services.size());
        ret.put("services", retServicesArray);

        int countServices = 0;
        for (BluetoothGattService service : services) {
            MLog.d(TAG, "service " + service.getUuid() + " " + service.getType());

            ReturnObject retService = new ReturnObject();
            retService.put("uuid", service.getUuid());
            retService.put("type", service.getType());
            retServicesArray.addPE(countServices++, retService);

            List<BluetoothGattCharacteristic> gattCharacteristic = service.getCharacteristics();
            PhonkNativeArray retCharArray = new PhonkNativeArray(gattCharacteristic.size());
            retService.put("characteristics", retCharArray);

            int counterCharacteristics = 0;
            for (BluetoothGattCharacteristic characteristic : gattCharacteristic) {
                MLog.d(TAG, "Characteristics" + characteristic.getUuid() + " " + characteristic.getProperties() + " " + characteristic.getWriteType() + " " + characteristic.getValue());
                gatt.readCharacteristic(characteristic);

                ReturnObject retChar = new ReturnObject();
                retChar.put("uuid", characteristic.getUuid());
                retChar.put("writeType", characteristic.getWriteType());
                /*
                retChar.put("descriptors", characteristic.getDescriptors());
                */
                retCharArray.addPE(counterCharacteristics++, retChar);
            }

        }

        if (mCallbackServices != null) {
            mCallbackServices.event(ret);
        }
    } else {
        MLog.d(TAG, "onServicesDiscovered received: " + status);
    }
}
 

@Override
@TargetApi(21)
// New services discovered
public void onServicesDiscovered(BluetoothGatt gatt, int status)
{
    PodEmuLog.debug("SIBLE: GATT onServiceDiscovered with status=" + status);
    super.onServicesDiscovered(gatt, status);
    boolean isSerialSupported = false;

    for (BluetoothGattService service : gatt.getServices())
    {
        PodEmuLog.debug("SIBLE: Service: " + service.getUuid());
        //if (Arrays.asList(BLE_UUIDS).contains(service.getUuid()))
        if(SERVICE_UUID.equals(service.getUuid()))
        {
            PodEmuLog.debug("SIBLE: BLE found serial device!");

            //gatt.readCharacteristic(service.getCharacteristic(CHARACTERISTIC_VERSION_UUID));
            //gatt.readCharacteristic(service.getCharacteristic(CHARACTERISTIC_DESC_UUID));
            //gatt.setCharacteristicNotification(service.getCharacteristic(CHARACTERISTIC_MESSAGE_UUID), true);
            //gatt.setCharacteristicNotification(service.getCharacteristic(CHARACTERISTIC_RFCOMM_TRANSFER_UUID), true);

            BluetoothGattCharacteristic bleGattCharacteristic = service.getCharacteristic(CHARACTERISTIC_SERIAL_UUID);

            if(bleGattCharacteristic != null)
            {
                isSerialSupported = true;
                gatt.readCharacteristic(service.getCharacteristic(CHARACTERISTIC_SERIAL_UUID));
                gatt.setCharacteristicNotification(bleGattCharacteristic, true);
            }
        }
    }

    if(isSerialSupported)
    {
        PodEmuLog.debug("SIBLE: BLE serial supported!");
    }
    else
    {
        PodEmuLog.debug("SIBLE: BLE serial NOT supported!");
    }
}
 

@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic c, int status) {
    String characteristic_uuid = c.getUuid().toString();
    Timber.d( "BluetoothGattCallback.onCharacteristicRead: CharacteristicUuid=" +
            characteristic_uuid +
            ",status=" + status +
            ",isGemini=" + isGemini);
    if (characteristicReadQueue.size() > 0) {
        characteristicReadQueue.remove();
    }

    // Stability Step 2: In OnCharacteristicRead, if the value is of the char firmware version, parse it's value.
    // If its >= 4034, JUST write the descriptor for the Serial Read characteristic to Enable notifications,
    // and set notify to true with gatt. Otherwise its Andromeda or lower and we can call the method to
    // read & notify all the characteristics we want. (Although I learned doing this that some android devices
    // have a max of 12 notify characteristics at once for some reason. At least I'm pretty sure.)
    // I also set a class-wide boolean value isGemini to true here so I don't have to keep checking if its Andromeda
    // or Gemini later on.
    if (characteristic_uuid.equals(OWDevice.OnewheelCharacteristicFirmwareRevision)) {
        Timber.d("We have the firmware revision! Checking version.");
        if (unsignedShort(c.getValue()) >= 4034) {
            Timber.d("It's Gemini!");
            isGemini = true;
            Timber.d("Stability Step 2.1: JUST write the descriptor for the Serial Read characteristic to Enable notifications");
            BluetoothGattCharacteristic gC = owGatService.getCharacteristic(UUID.fromString(OWDevice.OnewheelCharacteristicUartSerialRead));
            gatt.setCharacteristicNotification(gC, true);
            Timber.d("and set notify to true with gatt...");
            BluetoothGattDescriptor descriptor = gC.getDescriptor(UUID.fromString(OWDevice.OnewheelConfigUUID));
            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            gatt.writeDescriptor(descriptor);
        } else {
            Timber.d("It's before Gemini, likely Andromeda - calling read and notify characteristics");
            isGemini = false;
            whenActuallyConnected();
        }
    } else if (characteristic_uuid.equals(OWDevice.OnewheelCharacteristicRidingMode)) {
         Timber.d( "Got ride mode from the main UI thread:" + c.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 1));
    }

    //else if (characteristic_uuid.equals(OWDevice.OnewheelCharacteristicUartSerialRead)) {
    //    Timber.d("Got OnewheelCharacteristicUartSerialRead, calling unlockKeyGemini! ");
     //   unlockKeyGemini(gatt, c.getValue());
   // }



    if (BuildConfig.DEBUG) {
        byte[] v_bytes = c.getValue();
        StringBuilder sb = new StringBuilder();
        for (byte b : c.getValue()) {
            sb.append(String.format("%02x", b));
        }
        Timber.d( "HEX %02x: " + sb);
        Timber.d( "Arrays.toString() value: " + Arrays.toString(v_bytes));
        Timber.d( "String value: " + c.getStringValue(0));
        Timber.d( "Unsigned short: " + unsignedShort(v_bytes));
        Timber.d( "getIntValue(FORMAT_UINT8,0) " + c.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0));
        Timber.d( "getIntValue(FORMAT_UINT8,1) " + c.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 1));
    }

    mOWDevice.processUUID(c);

    mOWDevice.setBatteryRemaining(mainActivity);

    // Callback to make sure the queue is drained

    if (characteristicReadQueue.size() > 0) {
        gatt.readCharacteristic(characteristicReadQueue.element());
    }

}