TurtleShell Turtle

rednet.open("left")

function centerPrint(txt)
  w, h = term.getSize()
  term.setCursorPos(w / 2 - math.floor(string.len(txt) / 2), h / 2)
  print(txt)
end

term.setBackgroundColor(colors.white)
term.setTextColor(colors.blue)
term.clear()
term.setCursorPos(1,1)
centerPrint("Waiting for server...")
rednet.broadcast("hello?")
id, msg = rednet.receive("im here!", 5)

if msg == "im here!" then
  term.clear()
  centerPrint("Server found!")
else
  term.setTextColor(colors.white)
  term.setBackgroundColor(colors.red)
  term.clear()
  print("Server not found or invalid server contacted.")
  sleep(4)
  os.reboot()
end