java - GATT 特性不改变值

Question

BLE 设备(脉搏计)的特性值始终相同。信号转到onCharacteristicChanged，但值没有改变，尝试通过不同的方式获取该值。

@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
super.onServicesDiscovered(gatt, status);
    BluetoothGattCharacteristic characteristic3 = gatt.getService(UUID.fromString("0000180f-0000-1000-8000-00805f9b34fb"))
                    .getCharacteristic(UUID.fromString("00002a19-0000-1000-8000-00805f9b34fb"));
    gatt.setCharacteristicNotification(characteristic3, true);
    gatt.readCharacteristic(characteristic3);
}

@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
    super.onCharacteristicRead(gatt, characteristic, status);
    UUID uuid = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");
    BluetoothGattDescriptor descriptor = characteristic.getDescriptor(uuid);
    descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
    gatt.writeDescriptor(descriptor);
}

@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
    super.onCharacteristicChanged(gatt, characteristic);
    Log.e(TAG, "pulse: " + characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0));
}

logcat

Answer 1

决定:

@Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
    super.onServicesDiscovered(gatt, status);

    BluetoothGattCharacteristic characteristic2 = gatt.getService(UUID.fromString("0000180d-0000-1000-8000-00805f9b34fb"))
                    .getCharacteristic(UUID.fromString("00002a37-0000-1000-8000-00805f9b34fb"));

    gatt.setCharacteristicNotification(characteristic2, true);

    // 1 !!!!!!
    UUID uuid = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");
    BluetoothGattDescriptor descriptor = characteristic2.getDescriptor(uuid);
    descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
    gatt.writeDescriptor(descriptor);

    // 2 !!!!!!
    gatt.readCharacteristic(characteristic2);
}

这个Helped，更改 UUID(it can be found)，lib 获取值 - SmartGattLib，并且所有工作)