Request an update of the active id list

def update_active_id_list(self, update_active_ids_finished_cb):
        """Request an update of the active id list"""
        if not self._update_active_ids_finished_cb:
            self._update_active_ids_finished_cb = update_active_ids_finished_cb
            self.active_anchor_ids = []

            self.active_ids_valid = False

            logger.debug('Updating active ids of memory {}'.format(self.id))

            # Start reading the header
            self.mem_handler.read(self, LocoMemory2.ADR_ACTIVE_ID_LIST,
                                  LocoMemory2.ID_LIST_LEN)