rc_auth issue

[jafar habibi]

i use following code as in radexample.c
#include freeradius-client.h
result = rc_auth(rh, 0, send, &received, msg);
after executing the result == RC_OK
and i can see in freeradius server the authentication is ok.
but VALUE_PAIR received is still NULL after calling above function.
and i cant retrieve the incoming attributes from radius server.

am i doing something wrong?

thanks for reading