[Discuss-gnuradio] Is there way to specify the destination of signal ?

Hi all.

I want to make unicast communication system such as Wi-Fi using SDR(in my case, usrp n210)

however, I can't find any block like of that.

Exactly what I'm saying like this situation :

A -------> B    

      C 

(A; Tx packet to B, B; Rx packet from A, C; discard packet from A to B)

Is this possible in GNU Radio ?