Enable bluetooth discoverablility.

async def set_discovery_enabled(self):
        """Enable bluetooth discoverablility."""
        endpoint = '/setup/bluetooth/discovery'
        data = {"enable_discovery": True}
        url = API.format(ip=self._ipaddress, endpoint=endpoint)
        try:
            async with async_timeout.timeout(5, loop=self._loop):
                response = await self._session.post(url,
                                                    headers=HEADERS,
                                                    data=json.dumps(data))
                _LOGGER.debug(response.status)
        except (asyncio.TimeoutError,
                aiohttp.ClientError, socket.gaierror) as error:
            _LOGGER.error('Error connecting to %s - %s', self._ipaddress, error)