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add subscription identifier format and session ID association details to worker communication protocol
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Siwat Sirichai 2025-07-14 11:02:05 +07:00
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worker.md
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@ -288,6 +288,24 @@ Or to clear the session:
> **Note:**
> - The worker should store the session ID for the given subscription and use it in subsequent detection or patch messages as appropriate. If `sessionId` is `null`, the worker should treat the subscription as having no active session.
## Subscription Identifier Format
The `subscriptionIdentifier` used in all messages is constructed as:
```
displayIdentifier;cameraIdentifier
```
This uniquely identifies a camera subscription for a specific display.
### Session ID Association
When the backend sends a `setSessionId` command, it will only provide the `displayIdentifier` (not the full `subscriptionIdentifier`).
**Worker Responsibility:**
- The worker must match the `displayIdentifier` to all active subscriptions for that display (i.e., all `subscriptionIdentifier` values that start with `displayIdentifier;`).
- The worker should set or clear the session ID for all matching subscriptions.
## 6. Example Communication Log
This section shows a typical sequence of messages between the backend and the worker. Patch messages are not included, as they are only used when the worker cannot keep up.