Phoenix Channels [warn] Ignoring unmatched topic "topic:subtopic" - How to Avoid Terminal Warning Message?

Question

While running the Phoenix Chat Example App on localhost we are seeing this "noisy" warning:

[warn] Ignoring unmatched topic "topic:subtopic" in ChatWeb.UserSocket

code/phoenix-chat-example $ mix phx.server [info] Running ChatWeb.Endpoint with Cowboy using http://0.0.0.0:4000 09:50:37 - info: compiled 6 files into 2 files, copied 3 in 1.7 sec [warn] Ignoring unmatched topic "topic:subtopic" in ChatWeb.UserSocket [info] JOIN "chat_room:lobby" to ChatWeb.ChatRoomChannel Transport: Phoenix.Transports.WebSocket (2.0.0) Serializer: Phoenix.Transports.V2.WebSocketSerializer Parameters: %{} [info] Replied chat_room:lobby :ok [debug] QUERY OK source="messages" db=5.9ms decode=7.3ms SELECT m0."id", m0."message", m0."name", m0."inserted_at", m0."updated_at" FROM "messages" AS m0 [] [warn] Ignoring unmatched topic "topic:subtopic" in ChatWeb.UserSocket [warn] Ignoring unmatched topic "topic:subtopic" in ChatWeb.UserSocket [warn] Ignoring unmatched topic "topic:subtopic" in ChatWeb.UserSocket [warn] Ignoring unmatched topic "topic:subtopic" in ChatWeb.UserSocket [warn] Ignoring unmatched topic "topic:subtopic" in ChatWeb.UserSocket

The warning just keeps being logged in the Terminal/Console indefinitely while the client is open ...

Tried searching Google / GitHub / StackOverflow / Elixir Forum ... 🔍
but no obvious solution ... 😞

If you know how to remove this warning, please share! Thanks! 🖖

Additional Info

• OS: OSX 10.13.2 (latest)
• Elixir: v1.5.3 (latest)
• Phoenix: v1.3.0 (current/stable)
• Terminal: iTerm v3.1.5

Answer 1

The client tries to connect to this channel.

The channel you do define has a completely different name.

Bring these two into correspondence, e.g. by changing topic:subtopic to chat_room:lobby.