ZenohUTransport::QueryHandler() does not fill the format field in the payload

[sanjok-itin]

RPC server receives the payload with the default (RAW) format instead of the client sent format.

[gregmedd]

@sanjok-itin - Can you provide more information about the test you ran? Or some simple example code that reproduces the issue so we can see it? Thanks!

It would also be helpful to understand the impact and severity. Is this an urgent fix for right now, or can it wait for the transport rewrite coming for uP 1.5.8?

[sanjok-itin]

my test is a bit complicated, the source code - https://github.com/eclipse-uprotocol/up-client-zenoh-cpp/blob/main/lib/src/zenohUTransport.cpp#L462
The Payload object is constructed with the actual payload, but the format field is not attached.

I have a workaround of encoding the format inside the payload buffer, so the issue is not urgent, just the workaround requires additional buffer copy.