[Discuss-gnuradio] Is there a project which implements half-duplex communications?

Hello, GNU Radio users,

Very long time ago, USRP 1 was not suitable for half-duplex communications because USB 2.0 interface is too slow to achieve it.

But now, there are USRP embedded and gigabit ethernet supporting USRP series.

In my opinion, thus, half-duplex communications might be achievable nowadays.

I am curious that there is a project which implements half-duplex communications.

If there is, how many USRPs, daughterboards and antennas are used for each node?

Can I find such a project in pybombs?

In my guess, a half-duplex communication application can be built from both USRP sink and source being placed in one flow graph.

But I have no idea of the rest of the flow graph. Should the flow graph open loop or closed loop?

Is there a special configuration or tweak on USRP or GNU Radio required to achieve half-duplex communications?

I apologize if my question sounds quite vague.

Regards,

Jeon.