hierarchyId

(Optional) If you don't provide a hierarchyId, all the immediate assets in the traversalDirection will be returned.

The ID of the hierarchy by which child assets are associated to the asset. (This can be either the actual ID in UUID format, or else externalId: followed by the external ID, if it has one. For more information, see Referencing objects with external IDs in the IoT SiteWise User Guide.)

For more information, see Asset hierarchies in the IoT SiteWise User Guide.