Abstract
The user datagram protocol (UDP) is the closest thing to standard serial communication techniques used in an Internet protocol (IP). UDP and RS-232 leave the data integrity tasks up to the application. A very useful file transfer protocol, trivial file transfer protocol (TFTP) is built on top of UDP. UDP is a very simple and easy to understand protocol. It modifies an application-generated message by tagging on a checksum, a source port number and a destination port number of its own before passing the UDP segment to IP for encapsulation. IP does its best to deliver the UDP segment because there is nothing within IP or the UDP segment it is carrying to guarantee that the UDP segment will arrive intact. A UDP transmission can occur at any time without the need to establish a communications session with the remote host. The best way to demonstrate how UDP works with the AirDrop-P is to initiate a UDP transmission from SNOOPER's EDTP Internet Test Panel and follow the UDP datagram into and out of the AirDrop-P's PIC18LF8621 and 802.11 b CompactFlash network interface card (NIC).
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