ISO 20078-2:2019 pdf free

ISO 20078-2:2019 pdf free.Road vehicles – Extended vehicle (ExVe) web services
The following defines the requirements on a Representational State Transfer (REST)[3] based web service interface using Hypertext Transfer Protocol Secure (HTTPS)[1][2][8] based on Transport Layer Security (TLS) to give the Accessing Party secure Access to Resources provided by the Offering Party. The Resources, the Resource Groups or the Containers, and how to apply those on a specific presentation or application layer of the Accessing Party are described in ISO 20078-1. How an Accessing Party authenticates and how it is authorized for Access to Resources is described in ISO 20078-3.
There are two primary elements defining an URI; Entities and Resources (Table 2). Entities are the fundamental objects representing e.g. vehicles, ECUs, drivers and fleets. Resources are the actual data,aggregated information or functions associated with an entity and a specific use case.Resources are exposed through web services. In most cases there is a many-to-many relationship between Resources and web services. This subclause outlines how web services and Resources relate to each other and how granting of Resources is reflected when exposing them through web services.Some functions require an asynchronous interaction pattern (Figure 1). This is for example required when Resources need to be read from the Connected Vehicle rather than being available off board.
Reading the Connected Vehicle’s current position and speed or the active diagnostics trouble codes could be examples of this. Depending on the architecture and implementation, such operations add a roundtrip delay that is hard to determine due to the connectivity of the vehicle, e.g. network latency, network coverage or vehicle in wrong mode.
To cope with unpredictable response times and avoid keeping the HTTP session open for a long time,the server will respond directly to the client request. Either with the result of the operation or with a location where the client can retrieve (request again) the status of the operation and finally retrieving the result.ISO 20078-2 pdf free download.