void loop()
{
    client = server.available();
    if (!client) return;
    data = checkClient();
    Serial.println(data);

    if (data == "forw")
      rotateForward();
    else if (data == "back")
      rotateBackward();
    else if (data == "lefo")
      rotateLeftForward();
    else if (data == "rifo")
      rotateRightForward();
    else if (data == "lebk")
      rotateLeftBackward();
    else if (data == "ribk")
      rotateRightBackward();
    else if (data == "stop")
      stop();

    Serial.println("New loop");
}