Subscribe to a live vehicle speed signal over COVESA VISS using a kuksa-databroker instance instead of polling
domain: covesa.github.io · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Deploy or connect to an eclipse-kuksa/kuksa-databroker instance, noting its primary/native API is gRPC (kuksa.val.v2 and kuksa.val.v1), with VISS support offered as a documented subset over WebSocket
Open a WebSocket connection to the databroker's VISS-compatible endpoint
Send a JSON 'subscribe' action request referencing the VSS signal path (e.g. Vehicle.Speed) with a requestId
Confirm the databroker streams subscription updates as they occur, since VISS Subscribe/Unsubscribe operations are only available over WebSocket/MQTT transports, not plain HTTP
Fall back to the native gRPC API if you need capabilities beyond the documented VISS subset, since the gRPC surface is the actively maintained, feature-complete interface
Known gotchas
The older eclipse/kuksa.val C++ server (pure VISS-over-WebSocket) is archived/deprecated in favor of kuksa-databroker — don't build against its docs expecting current behavior
kuksa-databroker only supports 'a subset' of the COVESA VISS v2 protocol, not the full spec — verify your specific Get/Subscribe usage is within that subset before relying on it in production
VISS Subscribe/Unsubscribe explicitly does not work over the HTTP transport — a client built assuming REST-style polling of a subscription won't receive updates
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