startup

local m = peripheral.wrap("right")
local event, message
m.open(8)

while true do
event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")

   if message == "An" then
     rs.setOutput("left", true)
     print(message)
   else
     rs.setOutput("left", false)
     print(message)
   end
end