this makes distribution and starting the server easier.ģ. Currently, a single 'adb' binary is used for both the server and client. Then, the client sends its service requests to the ADB server. It first tries to locate the ADB server on the host machine, and will start one automatically if none is found. ADB command-line client: The 'adb' command-line program is used to run adb commands from a shell or a script.
The BOOTLOADER and RECOVERY states correspond to alternate states of devices when they are in the bootloader or recovery mode.ģ. Otherwise, the device is OFFLINE, meaning that the ADB server detected a new device/emulator, but could not connect to the adbd daemon. The ADB server considers that a device is ONLINE when it has successfully connected to the adbd program within it. Its purpose is to connect to the ADB server (through USB for devices, through TCP for emulators) and provide a few services for clients that run on the host. ADB daemon (adbd): The 'adbd' program runs as a background process within an Android device or emulated system. The ADB server is really one giant multiplexing loop whose purpose is to orchestrate the exchange of data (packets, really) between clients, services and devices.Ģ. It thus maintains a list of "connected devices" and assigns a 'state' to each one of them: OFFLINE, BOOTLOADER, RECOVERY or ONLINE. Its purpose is to sense the USB ports to know when devices are attached/removed, as well as when emulator instances start/stop. ADB server : This is a background process that runs on the host machine. 7.4 Extract a backup (.ab extension) on PCĪs a whole, everything works through the following components:ġ.3.2 Pair with a device for secure TCP/IP communication.
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