function onCommand(cmd)
  -- fix moviment
  if(cmd == 0) then
    turtle.forward()
  elseif(cmd == 1) then
    turtle.back()
  elseif(cmd == 2) then
    turtle.turnLeft()
  elseif(cmd == 3) then
    turtle.turnRight()
  end
end

rednet.open("right")
local id = rednet.lookup("leo1553", "controller")
if(id == nil) then
  print("Server not Found.")
end

rednet.send(id, "Connected.", "leo1553")
while(true) do
  local event, recId, msg = os.pullEvent("rednet_message")
  if(recId == id) then
    print(msg)
    onCommand(tonumber(msg))
  end
end