Module draft12 

MoQT client implementation for draft-12.

Each draft lives in its own top-level module with a complete, independent implementation: connection, endpoint state machine, event types, observer trait, and per-flow state machines (subscribe, fetch, announce, track status). No code is shared across drafts — each draft carries its own copy because wire-level differences would make a shared layer leaky.

Enable via the draft12 feature.

Differences from draft-11

Draft-12 is a small, targeted revision of draft-11. The visible shifts:

• track_alias moves out of Subscribe and is instead returned by the publisher in SubscribeOk. The subscribe API no longer takes a client-chosen alias; the alias becomes available once SUBSCRIBE_OK arrives.
• SubscribeError loses its trailing track_alias field (there is no alias to echo since the client never sent one).
• New publisher-initiated messages: Publish (0x1D), PublishOk (0x1E), and PublishError (0x1F). A publisher can actively offer a track to the peer without waiting for a SUBSCRIBE; the peer responds with PUBLISH_OK (accepting with a filter/range) or PUBLISH_ERROR.
• Subgroup data-stream type ids shift from the 0x08–0x0D range to 0x10–0x15. Datagram ids (0x00–0x03) and fetch ids (0x05) are unchanged. This is handled inside AnySubgroupHeader::decode when called with DraftVersion::Draft12.

The version varint is 0xff000000 + 12.

Modules

connection

Outbound MoQT connection with MoQT framing over QUIC.

endpoint

Unified endpoint state machine orchestrating all MoQT protocol flows.

event

Client event types emitted via the observer. Client event types emitted by a draft-12 MoQT connection.

fetch

Fetch lifecycle state machine.

namespace

Announce / SubscribeAnnounces state machines.

observer

Connection observer trait for receiving client events. Connection observer trait for receiving structured events.

session

Session state, setup validation, and request ID allocation. MoQT session lifecycle management (draft-12).

subscription

Subscription lifecycle state machine.

track_status

Track status lifecycle state machine.