int modbus_flush(modbus_t *ctx);
The modbus_flush() function shall discard data received but not read to the socket or file descriptor associated to the context ctx.
The modbus_flush() function shall return 0 or the number of flushed bytes if successful. Otherwise it shall return -1 and set errno.
The libmodbus documentation was written by Stéphane Raimbault <m[blue][email protected]m>