Controller

modem = peripheral.wrap("back")
modem.open(5)

while true do

    local event, key = os.pullEvent("key")

    if key == keys.w then modem.transmit(5,5,"forward")
    print("going forward")
    end

    if key == keys.d then modem.transmit(5,5,"right")
        print("turning right")
    end

    if key == keys.a then modem.transmit(5,5,"left")
        print("going left")
    end

    if key == keys.s then modem.transmit(5,5,"backwards")
        print("going backwards")
        end
end