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 by a draft-12 MoQT connection.

fetch

Fetch lifecycle state machine.

namespace

Announce / SubscribeAnnounces state machines.

observer

Connection observer trait for receiving structured events.

publish

Lifecycle of a subscription a peer opened with PUBLISH.

session

MoQT session lifecycle management (draft-12).

subscription

Subscription lifecycle state machine.

track_status

Track status lifecycle state machine.