In the configuration where there is a longer latency to the FPGA, the XVC works fine:

https://github.com/slaclab/Simple-10GbE-RUDP-KCU105-Example/blob/main/firmware/python/simple_10gbe_rudp_kcu105_example/_Root.py#L95

https://github.com/slaclab/Simple-PGPv4-KCU105-Example/blob/main/firmware/python/simple_pgp4_kcu105_example/_Root.py#L70

However, if the latency to the FPGA is super low (example XVC running on the PCIe FPGA) then the XVC does not work. I have observed this behavior in the past and Mudit reported it to me today.

I suspect there is a "timeout" in the rogue XVC server/client code that needs to be modified to support both super low latency (<1ms) and typical communication latency (<100ms).