> It would be nice if dumbpipe revealed the local and remote IP and UDP port numbers via something like STDERR or a signal so that apps could send UDP datagrams on them with ordinary socket calls.

I believe this would be even more unreliable than UDP, since Iroh is also capable of using a relay server for when hole punching can't be performed, and Iroh also handles IP migration.

> it appears to be linux and macOS only

Iroh should work on Windows, IIUC, just the installer and possibly prebuilt binaries aren't provided. But dumbpipe isn't designed for UDP anyways, it's closer to a competitor for socat/nc.