startup

rednet.open("right")
timer = 0
while true do
  sender, message, protocol = rednet.receive(1)
  print("dideldi")
  if message == "start" then
    print("System gestartet")
    rednet.send(23, "start")
    while true do
      print("Sensoren Aktiv")
      senderB, messageB, protocolB = rednet.receive()
      if messageB == "CheckTrack" then
        print("CheckTrack")
        if redstone.getInput("back") == true then
          timer = timer + 1
          print("Timer erhoeht")
          if timer >= 15 then
            print("ZugLang")
            rednet.send(23, "LangB")
          else
            rednet.send(23, "Belegt")
            print("Belegt")
          end
        else
          rednet.send(23, "Frei")
          timer = 0
          print("frei")
        end
      end
    end
  end
end