本程序用于ESP32 蓝牙模块的断电重连，在连接成功因为对端模块 断电，故障，自模块，可以在对端上电之后，自动连接，不需重新设置(This program is used for the ESP32 Bluetooth module's power failure reconnection. The connection is successful, because the terminal module is power-off, and the fault is self module. It can connect automatically after the terminal is powered on, and does not need to reset.)