说明：  蓝牙5.0官方说明文档。相对于4.2版本，提高了传输速率和距离。并针对Iot实现应用，提供更低功耗。
(Bluetooth 5 official documentation. Compared with the 4.2 version, the transmission speed and distance are increased. And the application of Iot is implemented to provide lower power consumption.)