说明：  本人自己通过学习15693协议后，做了些笔记，与大家共享。其中里面有自己摘录的重要信息，使大家今后学习起来比较方便。
(I own learning 15693 by agreement, made some notes, and share. One which has its own extract important information, so that we learn it was easier in the future.)