Clientside-elevator

rednet.open('back')
status = nil

while true do
  if status == nil then
    print("Send status to #148")
    rednet.send(148, "status")
    local res1, res2 = rednet.receive()
    status = res2
    print("Received status: "..tostring(status).."\nReload..")
    sleep(4)
  end

  if status then
    term.clear()
    term.setCursorPos(1, 1)
    print("CLICCA UN TASTO PER PARTIRE!")
    local event, id, msg = os.pullEvent()
    if event == 'rednet_message' then
      if msg == "invertProp" then
        status = false
      end
    elseif event == 'key' then
      rednet.send(148, "down")
      print("\nL'ascensore sta scendendo...")
      rednet.receive()
      status = false
    end
  else
    term.clear()
    term.setCursorPos(1, 1)
    print("CLICCA UN TASTO PER CHIAMARE")
    local event, id, msg = os.pullEvent()
    if event == 'rednet_message' then
      if msg == "invertProp" then
        status = true
      end
    elseif event == 'key' then
      rednet.send(148, "up")
      print("\nL'ascensore sta salendo...")
      rednet.receive()
      status = true
    end
  end
end