https://blog.csdn.net/ldcung/article/details/77435210
https://blog.csdn.net/leconiot/article/details/76610929
https://blog.csdn.net/chengdong1314/article/details/51531504
https://blog.csdn.net/weiqifa0/article/details/50781948
https://blog.csdn.net/chengdong1314/article/details/52796086
http://blog.sina.com.cn/s/blog_67a981d80102wdix.html
https://blog.csdn.net/a369000753/article/details/51206309
http://blog.chinaunix.net/uid-28852942-id-5748595.html
角色描述：
https://www.cnblogs.com/smart-mutouren/p/5937990.html
GAP GATT的EVT在链接及数据收发中的功能：
https://wenku.baidu.com/view/b2d66ec7db38376baf1ffc4ffe4733687e21fc93.html