startup

rednet.open("right")
m = peripheral.wrap("left")

while true do
  sendID,mess,dist=rednet.receive()
  print(mess)
  if sendID == 7 then
    print("Opening portal #"..mess)
    local i = tonumber(mess)
    turtle.select(i)
    turtle.drop()
    for i=5,1,-1 do
      m.clear()
      m.setCursorPos(1,1)
      m.write("Go!")
      m.setCursorPos(2,2)
      m.setTextScale(2)
      m.write(tostring(i))
      sleep(1)
    end
    m.clear()
    turtle.suck()
  end
end