提供蓝牙测试所有功能，连接断开，发送数据(Provide Bluetooth testing all functions, disconnect, send data)

实现了hc-05蓝牙模块与安卓手机app连接收发数据，亲测可用，适合初学者学习，欢迎交流沟通(Hc-05 bluetooth module is connected with android mobile app to send and receive data. It can be used for hands-on test. It is suitable for beginners to learn)