modbus_flush(3) Manual Page

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 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 <stephane.raimbault@gmail.com>