def dump_next(self):
        """Dump the next reading from the stream.

        Returns:
            IOTileReading: The next reading or None if there isn't one
        """

        if self.dump_walker is None:
            return pack_error(ControllerSubsystem.SENSOR_LOG, SensorLogError.STREAM_WALKER_NOT_INITIALIZED)

        try:
            return self.dump_walker.pop()
        except StreamEmptyError:
            return None
Dump the next reading from the stream.

        Returns:
            IOTileReading: The next reading or None if there isn't one