Function canonical_topic 

pub fn canonical_topic(addr: &str) -> String

The canonical relay topic for a peer address — its stable identity on the relay, computed identically by both endpoints.

A multiaddr or ws:// URL normalizes to its ws:// form (so /ip4/127.0.0.1/tcp/8000 and ws://127.0.0.1:8000 name the same peer); any other string (a bare name like "alice") is used verbatim (trimmed). This is what Send … to <peer> publishes on and what Listen at "<me>" subscribes to, so a sender and a receiver that write the same address agree on the topic.