| ID | product.ingestion.mqtt_broker.session_store |
|---|---|
| Description | Persistent client sessions and QoS state. |
| Key | session_store |
| Type | component:database |
| Team | Ingestion |
| Owner | ingestion@iotgateway.example |
| Status | active |
| Technologies | Redis |
| Attributes | retention: session-ttl, store: Redis |
| Tags |
Table of contents
Guide
Session Store
The Session Store keeps the state that makes MQTT sessions persistent: which clients are connected, what they are subscribed to, and which QoS 1/2 messages are still in flight. It is the reason a device can drop off the network and resume exactly where it left off.
Storage profile
Redis, in-memory with disk persistence for crash recovery. Entries are keyed
by client_id and carry a TTL so abandoned sessions expire automatically
instead of leaking memory across the fleet.