This is all you need to know. Connect all parport data pins together and connect it to suitable relay. Preferably 3-pin relay, so the Wifi-power-on is the default state.

    $ cat wifi-off
    #! /usr/bin/python2
    import parallel,time
    p = parallel.Parallel()  # open LPT1 or /dev/parport0
    p.setData(0xFF)
          
    $ cat wifi-on
    #! /usr/bin/python2
    import parallel,time
    p = parallel.Parallel()  # open LPT1 or /dev/parport0
    p.setData(0x0)