Shield Controller

SERVER_PORT = 20

local modem = peripheral.wrap("top")
modem.open(SERVER_PORT)

local id, message = rednet.receive()

	if message == "on" then
		redstone.setAnalogOutput("back",15)
		print("Shield is active!")
	end

	if message == "off" then
		redstone.setAnalogOutput("back",0)
		print("Shield has been deactivated!")
	end