code: def get_characteristic_handle_from_uuid(self, uuid):
          
          ch = self.get_characteristic_from_uuid(uuid)
          return None if ch is None else ch.char_handle
docs: Given a characteristic UUID, return its handle.
      
          Args:
              uuid (str): a string containing the hex-encoded UUID
  
          Returns:
              None if an error occurs, otherwise an integer handle.