KUKSA.val supports parts of VISS V1 https://www.w3.org/TR/vehicle-information-service/ as well as parts of the upcoming VISS2 standard (Gen2 Core, Gen2 Transport), that are applicable to in-vehicle VSS servers. KUKSA.val also has a gRPC interface to communicate.
The following document describes what is supported on the websocket (aka KUKSA.val Server) and gRPC Interface (aka Databroker):