void serial_close(SERIALPORT *port) {}
int serial_getchar(SERIALPORT *port) { return EOF; }
int serial_putchar(SERIALPORT *port, unsigned char ch) { return 0; }
void serial_close(SERIALPORT *port) {}
int serial_getchar(SERIALPORT *port) { return EOF; }
int serial_putchar(SERIALPORT *port, unsigned char ch) { return 0; }