Hi there! I wanted to walk you through how the backend Python application handles chat messages coming from the frontend's

useChat

interface. These messages are sent as text streams on the

lk.chat

topic. So, whenever a user sends a message, it travels through LiveKit's data stream system, and our backend is set up to listen by registering a handler specifically for the

lk.chat

topic. Here’s a simple example to show you how the backend can catch these incoming chat messages:

async def on_chat_message_received(reader: rtc.TextStreamReader, participant_identity: str):
    full_text = await reader.read_all()
    print(f"Received chat message from {participant_identity}: '{full_text}'")

# Register the handler
room.register_text_stream_handler("chat", on_chat_message_received)

This way, the backend is ready to receive chat messages in real-time, whether they come from the frontend’s

useChat

or LiveKit’s built-in Chat component. I hope this helps clarify things! If you have any more questions or need further assistance, feel free to ask. Sources: Agents v0.x migration guide - Node.js | LiveKit Docs | packages/react/src/prefabs/Chat.tsx | Sending text | LiveKit Docs | Agents 0.x migration guide | LiveKit Docs