Allowing N0 (or other) relays only for hole-punching, but not for subsequent traffic

[ppetr]

In order to avoid routing possibly heavy traffic through relays, I'm curious if it'd be possible to extend Iroh and provide a preset with an option to allow using relays only for the hole-punching phase.

In my experimental app I created a helper function to publish a stream capturing whether a connection is relayed or not. But this only allows me to block traffic, not to negotiate another possible path in a Connection, in order to avoid passing traffic through a relay.

[flub]

Yes, this is a common request and is something that is somewhere on the roadmap. We're just not yet sure quite when :)

[matheus23]

We agree, see also #3535 and #4023