def register_callback(self, event, callback):
        self.__callbacks[event].append(callback)
Convert a hex string to an unsigned application tag.
dataset/ETHPy150Open Yelp/Testify/testify/test_case.py/TestCase.register_callback--crossover with--dataset/ETHPy150Open JoelBender/bacpypes/tests/test_primitive_data/test_unsigned.py/unsigned_tag