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scrcpy (short for "screen copy") is a free and open-source screen mirroring application that allows control of an Android device from a desktop computer. [2] The software is developed by Genymobile SAS, a company which develops Android emulator Genymotion. [3] The application primarily uses the Android Debug Bridge (ADB) via a USB connection to ...
USB On-The-Go (USB OTG or just OTG) is a specification first used in late 2001 that allows USB devices, such as tablets or smartphones, to also act as a host, allowing other USB devices, such as USB flash drives, digital cameras, mouse or keyboards, to be attached to them. Use of USB OTG allows devices to switch back and forth between the roles ...
The threat surface of a USB however is bi-directional and a malicious peripheral device could attack the host. An infected edge device cannot easily be mitigated by WebUSB API's. In many device configurations trusted USB ports are used to deliver firmware upgrades and a malicious edge device could grant attackers persistence in a system. [11] [4]
Transfer performance of USB sideloading varies greatly, depending on the USB version supported, and further still by the actual engineering implementation of the USB controller. USB is available in Low-Speed (1.2 Mbit/s, 150 KB/s), Full-Speed (12 Mbit/s, 1.5 MB/s), and Hi-Speed levels, with High-Speed USB transferring up to 480 Mbit/s (60 MB/s).
According to a USB-IF chairman, "at least 10 to 15 percent of the stated peak 60 MB/s (480 Mbit/s) of Hi-speed USB goes to overhead—the communication protocol between the card and the peripheral. Overhead is a component of all connectivity standards". [1] Tables illustrating the transfer limits are shown in Chapter 5 of the USB spec.
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Each USB HID interface communicates with the host using either a control pipe or an interrupt pipe. Isochronous and bulk pipes are not used in HID class devices. Both IN and OUT control transfers are required for enumeration; only an IN interrupt transfer is required for HID reports. OUT interrupt transfers are optional in HID-class devices.