Send ReadyForRoomEvent after Connect to flush queued room events#282
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The Rust FFI now parks the connect task after sending ConnectCallback and only spawns event-forwarding tasks once the client sends ReadyForRoomEventRequest. Without it, room events emitted between Connect and the C# listener registration were dropped (late-join scenario), and on the new Rust SDK the room is closed with ConnectionTimeout after 1s. Room.OnConnect now sends the ready request immediately after subscribing to FfiClient.RoomEventReceived and before firing the public Connected event. Adds a PlayMode regression test that publishes 4 tracks before a subscriber joins late and asserts every TrackSubscribed event arrives exactly once. Proto bindings regenerated via Scripts~/generate_proto.sh against the new ffi.proto / room.proto. DataTrack.cs consumer updated for the DataTrackStreamEOS.error field type change (string -> message). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
xianshijing-lk
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May 22, 2026
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I tested it locally. I am landing it to avoid breaking the functionalities
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Dependency
Depends on: livekit/rust-sdks#1068 - have to check why this even passes one of the two test suites without.
Should be reviewed once I bump the Rust FFI to the new release 0.12.59 that will have the depending change.
Summary
Room.OnConnectnow sends the new FFIReadyForRoomEventRequestafter subscribing toFfiClient.RoomEventReceivedand before firing the publicConnectedevent, completing the new ready-handshake the Rust SDK requires.LateJoinTrackSubscriptionTests) that publishes 2 audio + 2 video tracks first, then connects a late joiner withTrackSubscribedpre-wired, and asserts every snapshot publication produces exactly oneTrackSubscribedevent.DataTrack.csfor theDataTrackStreamEOS.errorfield type change.Why
Without
ReadyForRoomEventRequest, room events emitted betweenConnectCallbackand the C# listener registration could be silently dropped — late joiners would missTrackSubscribed/ParticipantConnectedfor state that already existed at connect time. The new Rust contract (onclient-sdk-rustbranchladvoc/ffi-event-flush) makes this deterministic: the connect task parks for 1 s waiting forReadyForRoomEventRequestand disconnects the room withConnectionTimeoutif it never arrives. This PR ports that contract to the Unity SDK.🤖 Generated with Claude Code