A great thing about iroh is that due to it being just QUIC, when you learn about iroh you also learn about details of QUIC that are useful and transferrable for traditional p2p QUIC connections.
I think that with Kotlin support, the creation of some android/multi-platform gui apps can be made easier if they want to use Iroh.
Also, they are very principled when it comes to peer to peer purity, whereas iroh is a bit more pragmatic. We use dedicated relays to faciliate hole punching, whereas holepunch tries to use other peers as a temporary relay for hole punching messages.
Another difference is that holepunch have their own DHT, where we have a less decentralised address lookup service by default and use the mainline DHT as a fully p2p alternative.
So TLDR if you are doing js in the browser, holepunch.to might be a good fit. If you work on native mobile apps or embedded devices, iroh will be better since it is pretty frugal. If you work with node.js, both will work. Just evaluate them both and use what works better for you.
E.g. we support tiny embedded devices such as esp32. https://www.iroh.computer/blog/iroh-on-esp32
But as someone who's not a network specialist, I fail to see how this is not a glorified P2P DNS.
Maybe this example helps:
https://github.com/n0-computer/iroh#rust-library
const ALPN: &[u8] = b"iroh-example/echo/0";
let endpoint = Endpoint::bind().await?;
// Open a connection to the accepting endpoint
let conn = endpoint.connect(addr, ALPN).await?;
// Open a bidirectional QUIC stream
let (mut send, mut recv) = conn.open_bi().await?;
// Send some data to be echoed
send.write_all(b"Hello, world!").await?;
send.finish()?;
// Receive the echo
let response = recv.read_to_end(1000).await?;
assert_eq!(&response, b"Hello, world!");
// As the side receiving the last application data - say goodbye
conn.close(0u32.into(), b"bye!");
// Close the endpoint and all its connections
endpoint.close().await;IP addresses break, dial keys instead
Modular networking stack for direct, peer-to-peer connections between devices
iroh establishes direct connections whenever possible, falling back to relay servers if necessary. Get fast, efficient, reliable connections that are authenticated and encrypted end-to-end using QUIC.
> IP addresses can break, without warning, and it's outside of your device's control.
We have DNS?
> Keys, however, are created & controlled by you. They stay the same as your device moves, and are yours to throw away, or not.
So are domain names? This page does not do a good job of helping me find what it is that I'm missing.