Hi Steve,

> Do you know what is the max rate of data possible to send via xmlrcp
> / zmq / dpu socket?

Speed is mostly a function of your connection , not of the protocol, so
there can't be a definite answer. I'd recommend just considering the
overhead of any sensibly packaged piece of samples as "small", and then
add a solid oversizing (2×?), because internet connections aren't
deterministic.

> Which of the three options is more efficient?

The three are pretty different; XMLRPC certainly is least well-fitting
to transport samples. I'd go with the ZMQ.

>  (BTW, is it possible to connect the X310's ethernet cable to the
> internet and control it remotely, or do I have to connect it directly
> to a host computer?)

Directly to a host computer; while, in theory, the X310 is a pretty IP-
standards conformant networking device, I simply can't, on very many
levels, recommend exposing one to the internet. Also, the latency over
an internet connection is completely unusable for UHD. 

Can you please describe your use case, and the kind of internet
connection you have? I feel like you're trying to implement something
that will, simply by virtue of the math behind it, relatively hard, and
it might be helpful to give you early feedback on the concept.

Best regards,
Marcus

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