etc/bluetooth/hcid.conf：hcid 所用的 HCI 后台进程配置文件，它指定了链接模式（主或从）、链接策略、询问和扫描模式，等等。

etc/bluetooth/hcid.conf: HCI daemon configuration file used by hcid that specifies link mode (master or slave), link policy, inquiry and scan mode, and so on

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然后这位“同伴”就可以跟踪手机的GPS随时了解他们爱的人所在的位置，而同时应用会定时在用户的主屏幕上显示一个按钮，询问“你还好吗？” 。

The 'companion' can then track the phone's GPS to see where their loved one is at any time, while the app will periodically show a button on the user's home screen asking 'Are you OK?

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