The USB stack also has a variety of options for the various types of peripherals. This list includes: hid, mass storage, printers, serial devices, audio devices and more. Low cost dongle options are supported.

The USB host device classes allow users to easily write and read files from USB data sticks, communicate using a serial bit stream, get keyboard or mouse input, and accept or send data to a USB audio device. With off the shelf support and a simple user interface, it is easy to get files from an embedded target, write them onto a usb data stick and then read them on a host workstation of some kind. In a similar fashion, serial data can be sent to and from a usb serial device simply by configuring a few parameters and reading and writing files. The standard POSIX interfaces for communication with attached USB hosts and devices offer total ease of use for things like usb to serial converters whether they are based on common chips or FTDI.

The USB device support is comprehensive including audio, hid (mouse and keyboard), serial and mass storage support. In an identical fashion to the USB host support, the device support utilizes simple functions for setup and standard POSIX file I/O and network I/O calls for device interaction. Using this approach, porting of applications to the environment is very simple and using the USB device support requires no special training.

USB on the go (OTG) is a combination of USB host and USB device. In this case, another protocol is used at startup which allows eiher end to be either host or device. There is also special cables that are required. This combination will allow devices to be connected by a single standard cable and then, depending on the circumstances, setup one as the host and the other as the device. If all the drivers and support are present, this approach works well. Difficulties do arise with respect to drivers in this configuration because on the fly installation is not possible on any system. It is not true on UNISON in any case.