The CDC OBEX driver provides a transport layer by exposing the USB device as a virtual COM port to the host operating system. The driver can be interfaced with an OBEX stack supporting various OBEX profiles, e.g. File Transfer, Object Push.


The OBEX protocol is designed to transmit data objects between devices. This protocol was originally developed for infrared data transfers but is being commonly used for Bluetooth and other various wireless communications.

The protocol is a message oriented but is designed to be layered above TCP-like protocols, which are character oriented. Therefore, OBEX is implemented using a pair of bulk pipes.

The CDC OBEX Driver is a component of the DriverCore product line. DriverCore offers standard USB Drivers, allowing device manufacturers to expose a variety of native communication interfaces via USB to different operating systems and platforms.

• Support for multiple CDC OBEX devices on separate physical USB devices
• Support composite USB devices with multiple CDC OBEX functions
• OBEX function is enumerated as a virtual Serial port
• User-mode transport layer that works above virtual Serial port and interfaces with OpenOBEX stack
• Support synchronous I/O and overlapped I/O
• Support serial events (e.g. TX empty, RX ready, RLSD, RING)

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