TCSANOW
ret = tcsetattr(STDIN_FILENO, TCSANOW, &state);
tcsetattr(serial_fd, TCSANOW, &saved_tty);
ret = tcsetattr(serial_fd, TCSANOW, &tty);
tcsetattr(STDIN_FILENO, TCSANOW, &saved_attributes);
tcsetattr(0, TCSANOW, &tc);
if (tcsetattr(STDIN_FILENO, TCSANOW, &local_term_attributes)) {
if (tcsetattr(STDIN_FILENO, TCSANOW, &original_term_attributes)) {