@Nullable
	public final byte[] getDescriptorValue(@NonNull final BluetoothGattDescriptor serverDescriptor) {
		if (descriptorValues != null && descriptorValues.containsKey(serverDescriptor))
			return descriptorValues.get(serverDescriptor);
		return serverDescriptor.getValue();
	}
Returns the value of the server descriptor. For descriptor that are not shared,
the value may be different for each connected device.

@param serverDescriptor The descriptor to get value of.
@return The value.
ble/src/main/java/no/nordicsemi/android/ble/BleManagerHandler.java