Server implementing a subset of TFTP allowing it to respond to read requests only. The intended use case is when you have a directory of (say) binary images you wish to upload to (say) a dev board running (say) u-boot.
This will run a server in the foreground, on the specified host and port, serving files out of the specified directory.
$ sudo tftp-ro --address=0.0.0.0:69 --directory=images