https://purengom.com/2017/11/12/%ed%99%94%ec%9b%a8%ec%9d%b4-%eb%aa%a8%eb%b0%94%ec%9d%bc-wi-fi-%ec%97%90%ea%b7%b8-%ea%b8%80%eb%a1%9c%eb%b2%8c-%ec%9b%90-%ec%97%90%ea%b7%b8-hw-5885/