docs: def handle_set_key(self):
          """Read incoming key from server"""
          track_id = self.reader.int()
          row = self.reader.int()
          value = self.reader.float()
          kind = self.reader.byte()
          logger.info(" -> track=%s, row=%s, value=%s, type=%s", track_id, row, value, kind)
  
          # Add or update track value
          track = self.tracks.get_by_id(track_id)
          track.add_or_update(row, value, kind)