docs: def _send_ffe(self, pid, app_id, app_flags, fr):
          """Send a flood-fill end packet.
  
          The cores and regions that the application should be loaded to will
          have been specified by a stream of flood-fill core select packets
          (FFCS).
          """
          arg1 = (NNCommands.flood_fill_end << 24) | pid
          arg2 = (app_id << 24) | (app_flags << 18)
          self._send_scp(255, 255, 0, SCPCommands.nearest_neighbour_packet,
                         arg1, arg2, fr)