kuksa-databroker: A Rust repository from Eclipse Kuksa

Eclipse Kuksa™ Databroker

Kuksa Databroker is a gRPC service acting as a broker of vehicle data / data points / signals.
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Table of Contents

Intro
- Features
Getting Started

Intro

The COVESA Vehicle Signal Specification (VSS) defines the names and semantics of a large set of data entries that represent the current and/or intended state of a vehicle's sensors and actuators organized in a tree-like structure. For example, the vehicle's current speed is represented by the Vehicle.Speed entry.

However, VSS does not define how these signals are to be collected and managed within a vehicle, nor does it prescribe how other components in the vehicle can read or write signal values from and to the tree.

Kuksa Databroker is a resource efficient implementation of the VSS signal tree and is intended to be run within a vehicle on a microprocessor based platform. It allows applications in the vehicle to interact with the vehicle's sensors and actuators using a uniform, high level gRPC API for querying signals, updating current and target values of sensors and actuators and getting notified about changes to signals of interest.

flowchart LR
    A[Application] --VSS--- DB
    DB[Kuksa Databroker] --VSS--- P
    P[Kuksa provider] --CAN frames etc---E
    E[ECU] --- Sensor
    E --- Actuator
    style DB fill:#999999,stroke:#444444,color:#ffffff

At the right end, Kuksa providers implement the link between the Databroker and a vehicle's Electronic Control Units (ECU) to which the hardware sensors and actuators are physically attached.

Data is usually exchanged with ECUs by means of a CAN bus or Ethernet based protocols like SOME/IP. Providers translate between the low level messages used by these protocols and the Databroker's high level gRPC API calls to update a sensor's current reading or to forward a set-point value to an actuator via its controlling ECU.

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Features

100% Open Source (Apache 2.0 license)
Written in Rust with an easy-to-use language agnostic gRPC interface
Lightweight (<4 MB statically compiled), allowing it to run on even small vehicle computers

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Getting started

The quickest possible way to get Kuksa Databroker up and running.

📝 Note: The examples in this section do not use TLS nor access control. Please refer to the User Guide for more sophisticated usage examples.

Prerequisites

Docker Engine or Podman
A custom Docker bridge network
```
docker network create kuksa
```

Starting Databroker

Start Databroker in a container attached to the kuksa bridge network using hostname Server:
```
docker run -it --rm --name Server --network kuksa ghcr.io/eclipse-kuksa/kuksa-databroker:main --insecure
```
💡 Tip: You can stop the container using ctrl-c.

Reading and writing VSS data using the CLI

Start the CLI in a container attached to the kuksa bridge network and connect to the Databroker container: The databroker supports both of sdv.databroker.v1 and kuksa.val.v1 as an API. Per default the databroker-cli uses the sdv.databroker.v1 interface. To change it use --protocol option when starting. Chosse eihter one of kuksa-val-v1 and sdv-databroker-v1.

# in a new terminal
docker run -it --rm --network kuksa ghcr.io/eclipse-kuksa/kuksa-databroker-cli:main --server Server:55555

The CLI provides an interactive prompt which can be used to send commands to the Databroker.

  ⠀⠀⠀⢀⣤⣶⣾⣿⢸⣿⣿⣷⣶⣤⡀
  ⠀⠀⣴⣿⡿⠋⣿⣿⠀⠀⠀⠈⠙⢿⣿⣦
  ⠀⣾⣿⠋⠀⠀⣿⣿⠀⠀⣶⣿⠀⠀⠙⣿⣷
  ⣸⣿⠇⠀⠀⠀⣿⣿⠠⣾⡿⠃⠀⠀⠀⠸⣿⣇⠀⠀⣶⠀⣠⡶⠂⠀⣶⠀⠀⢰⡆⠀⢰⡆⢀⣴⠖⠀⢠⡶⠶⠶⡦⠀⠀⠀⣰⣶⡀
  ⣿⣿⠀⠀⠀⠀⠿⢿⣷⣦⡀⠀⠀⠀⠀⠀⣿⣿⠀⠀⣿⢾⣏⠀⠀⠀⣿⠀⠀⢸⡇⠀⢸⡷⣿⡁⠀⠀⠘⠷⠶⠶⣦⠀⠀⢠⡟⠘⣷
  ⢹⣿⡆⠀⠀⠀⣿⣶⠈⢻⣿⡆⠀⠀⠀⢰⣿⡏⠀⠀⠿⠀⠙⠷⠄⠀⠙⠷⠶⠟⠁⠀⠸⠇⠈⠻⠦⠀⠐⠷⠶⠶⠟⠀⠠⠿⠁⠀⠹⠧
  ⠀⢿⣿⣄⠀⠀⣿⣿⠀⠀⠿⣿⠀⠀⣠⣿⡿
  ⠀⠀⠻⣿⣷⡄⣿⣿⠀⠀⠀⢀⣠⣾⣿⠟    databroker-cli
  ⠀⠀⠀⠈⠛⠇⢿⣿⣿⣿⣿⡿⠿⠛⠁     v0.4.1

Successfully connected to http://Server:55555/
sdv.databroker.v1 >

💡 Tip: The client retrieves metadata about the data entries that the Databroker knows about during startup. This allows for using TAB-completion of data entry names at the prompt.

Display help for supported commands

help

connect [URI]            Connect to server
get <PATH> [[PATH] ...]  Get signal value(s)
set <PATH> <VALUE>       Set actuator signal
subscribe <QUERY>        Subscribe to signals with QUERY
feed <PATH> <VALUE>      Publish signal value
metadata [PATTERN]       Fetch metadata. Provide PATTERN to list metadata of signals matching pattern.
token <TOKEN>            Use TOKEN as access token
token-file <FILE>        Use content of FILE as access token
help                     You're looking at it.
quit                     Quit

Get the vehicle's current speed
```
get Vehicle.Speed
```
```
[get]  OK
Vehicle.Speed: ( NotAvailable )
```
📝 Note When Databroker starts up, all data entries are initialized to empty values. Thus, the vehicle speed is being reported as NotAvailable.
Set the vehicle's current speed
```
publish Vehicle.Speed 100.34
```
```
[set]  OK
```

Get the vehicle's current speed

get Vehicle.Speed

[get]  OK
Vehicle.Speed: 100.34

Run the cli with:

Exit the client
```
quit
```

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Usage

Please refer to the User Guide for details regarding how to run and interact with Kuksa Databroker.

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Building

Building Kuksa Databroker from source code requires

a Rust tool chain

a local workspace containing the source code

git clone https://github.com/eclipse-kuksa/kuksa-databroker.git

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Building Examples and Binaries

# in ${WORKSPACE}
cargo build --examples --bins

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Building release Binaries

# in ${WORKSPACE}
cargo build --bins --release

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Runing Databroker Test Cases

# in ${WORKSPACE}
cargo test --all-targets

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Contributing

Please refer to the Kuksa Contributing Guide.

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License

Kuksa Databroker is provided under the terms of the Apache Software License 2.0.

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Contact

Please feel free to create GitHub Issues for reporting bugs and/or ask questions in our Gitter chat room.

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