https://blog.wongcw.com/2018/10/30/%e3%80%8aairdrop%e3%80%8b%e8%ae%93%e4%ba%8c%e5%8f%b0mac%e9%9b%bb%e8%85%a6%e7%9b%b8%e4%ba%92%e5%82%b3%e9%80%81%e6%aa%94%e6%a1%88%e6%b2%92%e8%b7%9d%e9%9b%a2/