modem = peripheral.wrap("top")
modem.open(42)

while true do
	local event, modemside, senderchannel, replychannel, message, senderdistance = os.pullEvent("modem_message")

	if message == "left on" then
		redstone.setOutput("left", true)
	else if message == "left off" then
		redstone.setOutput("left", false)
	else if message == "right on" then
		redstone.setOutput("right", true)
	else if message == "right off" then
		redstone.setOutput("right", false")
	end
end