You need an arduino uno (or similar) to hook this to a continuous servo.
Note, you do have to know what dev/tty the uno hooks up to, but it should be obvious if you do "ls /dev/tty.*" for me it's "/dev/tty.usbmodem1411". You need to put that in the server code (along with the ip & port you're using... client just needs ip & port).
There is a tkinter and a pygame client. In pygame, use the l/r arrow keys to move and to stop. In tkinter, use ',' for left and '.' for right and to stop.