Unicast message in GNURadio

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I have one USRP B210 and E312 and all the message transferred between them are via the broadcast message.

Is there any way to transmit a unicast message (point to point) in GNURadio?

If yes, can you please help me with an example?

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You're confusing GNU Radio with something it is not:

GNU Radio is a framework for designing signal processing flow graphs. It is especially useful for processing digital radio signals.

Whether a message is "unicast" or "broadcast" or whatever isn't anything that GNU Radio is concerned with. You'd typically just analyze a packet that you received to determine whether it was meant for you.

GNU Radio isn't something that you typically use to implement a network layer. Mostly, you do physical layer signal processing. As soon as you have packets of bits, you usually leave GNU Radio. Your problem arises from a misunderstanding of what GNU Radio does (and maybe, software defined radio in general).

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I found a great library, gr-mac which can handle the broadcast and unicast messaging above the gnuradio.

https://github.com/jmalsbury/gr-mac

I hope it will be helpful to other new gnuradio users like me.