typedef enum
{
...
BR9600 = 4,
...
BR115200 = 12,
...
#endif
}Ebaudrate;
#define MODEM_BAUDRATE BR9600
#if MODEM_BAUDRATE == BR9600
modem.send_P( SET_FIXED_LOCAL_RATE_WRITE_9600, STRLEN( SET_FIXED_LOCAL_RATE_WRITE_9600 ) );
#endif
#if MODEM_BAUDRATE == BR115200
modem.send_P( SET_FIXED_LOCAL_RATE_WRITE_115200, STRLEN( SET_FIXED_LOCAL_RATE_WRITE_115200 ) );
#endif
исполняются обе строки с modem.send_P