PassLock exit

os.pullEvent = os.pullEventRaw

local door = "exit"
local serverId = 7
local myId = os.computerID()
local ver = 2.2
local done = false

function gui()
 term.clear()
 term.setCursorPos(1,1)
 print("PassLock v."..ver)
 term.setCursorPos(1,3)
end

rednet.open("top")
while done == false do
 gui()
 write("Press enter to open the door...")
 io.read()
 rednet.send(serverId,door)
   senderId,message,distance = rednet.receive(5)
   if senderId == serverId then
    if message == "Valid" then
     gui()
     write("Door open!")
     rs.setOutput("back",true)
     sleep(5)
     rs.setOutput("back",false)
     os.shutdown()
    else
    os.shutdown()
    end
   end
end