adb devices 。理想情况下，我想在电话里面有相同的东西，说
adbdaemon host-info 让我的手机知道有一个与计算机的现有adb连接。
I want to know if the phone is currently connected to a host that can run adb commands from within the phone, no matter if it's using an app, a shell command constantly running, or any other method that doesn't require the host or an external server.
From the host, I can just run
adb devices. Ideally, I would like to have something equivalent inside the phone, say
adbdaemon host-info that let's my phone know that there is an existing adb connection with a computer.