Joseph Doherty e49e5895c1 feat(mqtt): add session persistence, QoS 2 state machine, and retained store (E2+E3) ...

Add MqttSessionStore with save/load/delete/list operations, flapper
detection (backoff on rapid reconnects), and TimeProvider-based testing.
Add MqttRetainedStore for per-topic retained messages with MQTT wildcard
matching (+/# filters). Add MqttQos2StateMachine tracking the full
PUBREC/PUBREL/PUBCOMP flow with duplicate rejection and timeout detection.

19 new tests: 9 session persistence, 10 QoS/retained message tests.

2026-02-24 15:13:34 -05:00

7.5 KiB

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