startup

local modem = peripheral.wrap("top")
modem.open(10)

while true do
  local event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")
  if message == "on" then
    rs.setOutput("left", true)
    rs.setOutput("right", true)
    rs.setOutput("back", true)
    rs.setOutput("front", true)
  elseif message == "off" then
    rs.setOutput("left", false)
    rs.setOutput("right", false)
    rs.setOutput("back", false)
    rs.setOutput("front", false)
  else
    os.sleep(1)
  end
end