code: def register_callback_created(self, func, serialised=True):
          
          self.__add_callback(_CB_CREATED, func, serialised_if_crud=serialised)
docs: Register a callback function to receive QAPI Unsolicited (resource) CREATED. The
          callback receives a single argument - the inner message. If `serialised` is not set,
          the callbacks might arrive out-of-order (e.g. created point before created thing).