I’d suggest looking into Phoenix.Channels which uses Phoenix.PubSub under the hood.
At a high level, you’ll want to subscribe to the chatroom topic in mount callback, publish/broadcast the message in handle_event callback for new messages from the client, and finally handling those messages published/broadcasted from other clients in handle_info callback. For a minimal working example, take a look at Step 4 — Subscribe & Consume Messages in Build Real-time Chat With Phoenix and LiveView in Fewer Than 50 Lines of Code.
And if you want to use Phoenix.PubSub directly, here’s a helpful repo that walks through the process in its readme: GitHub - dwyl/phoenix-liveview-chat-example: 💬 Step-by-step tutorial creates a Chat App using Phoenix LiveView including Presence, Authentication and Style with Tailwind CSS · GitHub.
