Sends the setBrightness Pixy command.
        This method sets the brightness (exposure) of Pixy's camera.

        :param brightness: range between 0 and 255 with 255 being the
                           brightest setting

        :returns: No return value.

def pixy_set_brightness(self, brightness):
        """
        Sends the setBrightness Pixy command.
        This method sets the brightness (exposure) of Pixy's camera.

        :param brightness: range between 0 and 255 with 255 being the
                           brightest setting

        :returns: No return value.
        """
        task = asyncio.ensure_future(self.core.pixy_set_brightness(brightness))
        self.loop.run_until_complete(task)