BLE低功耗蓝牙与经典蓝牙的区别，做蓝牙模块开发必须要了解的知识！
基本知识：
/developer/article/1602370
/p/d991f0fdec63
BLE例子：
http://ianharvey.github.io/bluepy-doc/scanentry.html
下面这个文章讲的很好
https://blog.lao-//08/05/python-BLE%E4%BD%BF%E7%94%A8.html#defaultdelegate
经典蓝牙例子：
https://pybluez.readthedocs.io/en/latest/install.html
