| ID | product.device_management.registry_service.state_tracker |
|---|---|
| Description | Tracks online / offline state per device. |
| Key | state_tracker |
| Type | component |
| Team | Device Management |
| Owner | device-mgmt@iotgateway.example |
| Status | active |
| Technologies | Go, Redis |
| Attributes | freshness: <5s |
| Tags |
Table of contents
Guide
Connection State Tracker
The Connection State Tracker keeps a fast, ephemeral view of which devices are currently connected. It reacts to MQTT session open/close events and to a liveness timeout, and exposes presence to the rest of the registry.
Why it is separate from the repository
Presence changes thousands of times per second across the fleet. Keeping it in a fast in-memory store (Redis) instead of the relational Device Repository protects the durable store from write amplification.