v0.44.0

[mqtt5 0.44.0] - 2026-09-29

Breaking

• broker::router::Registration has a new public field, epoch: the session queue's epoch at the moment the connection registered. Code that builds Registration with a struct literal must set it.

Fixed

• A client that reconnects with a clean start and subscribes before the previous connection has finished handing off now receives its retained messages. The new connection's packets are handled during the hand-off, so its QoS 1 and 2 retained messages, and publishes routed to its new subscriptions, were queued and then discarded when the session bound. The hand-off can last up to 30 seconds when the previous connection's socket is blocked. A clean start now discards the previous session's queue when the connection registers instead of when it binds.
• A connection displaced by a clean-start takeover can no longer re-queue its undelivered messages into the new session. Its re-queues and retained-message pushes are now dropped once the new session has discarded the queue. This also covers a hand-off that timed out while the previous connection was still running.

Added

• ClientQueue::requeue_front_in_epoch.

[mqttv5-cli 0.29.2] - 2026-09-29

Changed

• Requires mqtt5 0.44.

[mqtt5-wasm 2.1.2] - 2026-09-29

Changed

• Requires mqtt5 0.44. A connection displaced by a clean-start takeover no longer re-queues undelivered messages into the new session. No change to the wasm API.