Module draft13 

MoQT client implementation for draft-13.

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 draft13 feature.

Differences from draft-12

Draft-13 renames and restructures a few message types:

• SubscribeAnnounces / SubscribeAnnouncesOk / SubscribeAnnouncesError / UnsubscribeAnnounces are renamed to SubscribeNamespace / SubscribeNamespaceOk / SubscribeNamespaceError / UnsubscribeNamespace (same wire IDs 0x11-0x14).
• TrackStatusRequest (0x0D) becomes TrackStatus: a subscribe-like request carrying subscriber_priority, group_order, forward, and filter_type.
• TrackStatus (0x0E) becomes TrackStatusOk: a subscribe_ok-like response carrying track_alias, expires, group_order, content_exists, and an optional largest_location.
• New TrackStatusError (0x0F): request_id + error_code + reason_phrase.

The version varint is 0xff000000 + 13.

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 / SubscribeNamespace 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.