Delay Tolerant Networks. My altnet post series were about them except I didn't even realize it was about them until a commenter basically told me the DTN protocol stack was useful for what I was talking about lol.

The latest one focuses on ION (which is actually HDTN now). I haven't written a new post in a while because I was learning dtn7-go, but then got distracted by nixos and now I'm on RHEL for some reason. Focus is hard.

Anyway, if you read this one it should at least explain DTNs in general well enough: #330735