Scan for bluetooth devices.

async def get_scan_result(self):
        """Scan for bluetooth devices."""
        endpoint = '/setup/bluetooth/scan_results'
        url = API.format(ip=self._ipaddress, endpoint=endpoint)
        try:
            async with async_timeout.timeout(5, loop=self._loop):
                response = await self._session.get(url)
                self._devices = await response.json()
                _LOGGER.debug(self._devices)
        except (asyncio.TimeoutError,
                aiohttp.ClientError, socket.gaierror) as error:
            _LOGGER.error('Error connecting to %s - %s', self._ipaddress, error)