https://blog.wongcw.com/2019/06/16/wi-fi-6%e4%be%86%e4%ba%86%ef%bc%9a%e6%9b%b4%e6%96%b0%e5%ae%b6%e9%87%8c%e8%b7%af%e7%94%b1%e5%99%a8%e6%ad%a3%e7%95%b6%e6%99%82/