mqtt_broker_lite 2.1.1

A pure-Dart MQTT 3.1.1 broker. Supports wildcards, retained messages, QoS 0/1/2, will messages, authentication, TLS, and WebSocket transport.

2.1.1

Fixed

• Updated homepage and repository URLs in pubspec.yaml to point to the mqtt_broker_lite GitHub repository.

2.1.0

First release under the name mqtt_broker_lite. Previously developed in a private repository as dart_mqtt_broker.

New

• MqttBroker.ws(...): MQTT-over-WebSocket transport (default port 8080).
• MqttBroker.wss(...): MQTT-over-WebSocket-over-TLS transport (default port 8443).
• Pluggable MqttTransport abstraction; TcpTransport, WebSocketTransport.

Changed

• Internal ClientConnection now drives any MqttTransport, not just a raw Socket. The public broker API is unchanged.

2.0.0

Complete rewrite. The broker is now a real MQTT 3.1.1 implementation.

Breaking changes

• New Stream-based event API replaces onXxxListener callbacks. See README.
• The Client class is replaced by MqttSession (read-only view of a connected client).
• Library entry point is now package:mqtt_broker_lite/mqtt_broker_lite.dart.

New

• Streaming TCP packet reassembler (fixes packet fragmentation / batching bug).
• Full wildcard topic matching (+ and #).
• Retained messages with replay to new subscribers and clear-on-empty-payload.
• UNSUBSCRIBE / UNSUBACK.
• Will / Testament message published on abnormal disconnect.
• Pluggable authentication (MqttAuthenticator).
• Session takeover on duplicate client identifier.
• Clean session = false: subscriptions and queued QoS 1/2 messages persisted in-memory across reconnect.
• Keep-alive enforcement (1.5x timeout per spec).
• Full QoS 2 inbound state machine (store on PUBLISH, deliver on PUBREL).
• Per-session monotonic outbound packet identifiers with QoS 1/2 inflight tracking.
• Granted QoS downgrade per subscription.
• Topic validation (rejects +/# in PUBLISH topics, malformed filters).
• TLS server (MqttBroker.tls).
• Pluggable MqttLogger.

Fixed

• TCP stream framing: previously dropped fragmented and batched packets.
• Packet-type matching now masks the high nibble (PUBLISH with RETAIN no longer "unknown").
• Outbound PUBLISH with QoS > 0 now uses a valid non-zero packet identifier.
• CONNACK Session Present flag now reflects server-side session state.
• CONNECT parser handles MQTT 3.1 (MQIsdp) as well as 3.1.1 (MQTT).

1.0.4

• Documentation updates.

1.0.0

• Initial version.