code: def update_data(self, update_data_finished_cb):
          
          if not self._update_data_finished_cb and self.nr_of_anchors > 0:
              self._update_data_finished_cb = update_data_finished_cb
              self.anchor_data = {}
  
              self.data_valid = False
              self._nr_of_anchors_to_fetch = self.nr_of_anchors
  
              logger.debug('Updating anchor data of memory {}'.format(self.id))
  
              # Start reading the first anchor
              self._currently_fetching_index = 0
              self._request_page(self.anchor_ids[self._currently_fetching_index])
docs: Request an update of the anchor data