Request an update of the id list

def update_id_list(self, update_ids_finished_cb):
        """Request an update of the id list"""
        if not self._update_ids_finished_cb:
            self._update_ids_finished_cb = update_ids_finished_cb
            self.anchor_ids = []
            self.active_anchor_ids = []
            self.anchor_data = {}

            self.nr_of_anchors = 0
            self.ids_valid = False
            self.data_valid = False

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

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