It would be very nice to specify exactly which network interface you would like to bind the TFTP server listening port to. In some cases it's only necessary to open up loopback, in other cases you may only want to bind to a management network. I would like to see one of two things happen to satisfy this requirement.
1) You could allow me to get a handle to the socket such that I can make modifications to it on my own.
2) Add a constructor and/or method that allows me to pass a NetworkInterface instance to specify which nic to bind the server to.