This way, the helper class gets notified when a remote Bluetooth device is discovered.
这样，在发现远程蓝牙设备的时候，helper 类就会得到通知。
The human interface device (HID) profile describes how to communicate with a HID class device using a Bluetooth link.
用户接口设备(HID)配置文件描述了如何使用蓝牙链接与HID类设备通信。
When a device is paired, the basic information about that device (such as the device name, class, and MAC address) is saved and can be read using the Bluetooth APIs.
当一个设备配对后，设备的基本信息(例如设备名称、类、MAC地址)将被保存，并且可以使用蓝牙接口进行访问。
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