USB蓝牙适配器与外部蓝牙产品通信实例，可以实现搜索设备、建立配对、文件传输等功能，可以提供给蓝牙开发的朋友参考。-USB Bluetooth adapter to communicate with external Bluetooth products instance, you can search equipment, the establishment of the pairing, file transfer and other functions, and can provide t