UDS

Python package for handling Unified Diagnostic Services (UDS) protocol defined by ISO 14229. It supports different communication buses on both communication sides (client and server).

Documentation

User documentation is hosted by ReadTheDocs portal and available under the following link: https://uds.readthedocs.io/

Security policy for this package is defined in SECURITY.md file.

If you want to become a contributor, please read CONTRIBUTING.md file.

Why another UDS package?

There are a few already existing python packages to handle UDS protocol, so you might wonder why would you consider using this one?

This package is meant to support multiple buses (including CAN, LIN, Ethernet, K-Line, FlexRay) and multiple bus managers (e.g. python-can). Additionally, it handles both communication nodes (client and server), decoding monitored UDS communication, and contains detailed configuration to fully control all timing and transmission parameters.

Thanks to all these features, this package can have multiple use-cases, including:

• simple send-receive packets/messages to/from any network
• comprehensive node simulations
• testing of UDS protocol communication implementation - either on client (diagnostic tester / ECU) or server (ECU) side
• sniffing (and decoding) UDS communication

Unfortunately, all previously mentioned plans make the project quite huge. At the time of writing, the implementation process of these features is still ongoing (and probably the development would slowly progress over at least a few more years, unless more people get engaged in the project and/or more sponsors are found). On the other hand, the architecture to support all these features is already designed and some of them are already implemented with others defined or planned.

To check the current implementation status, visit:

• https://uds.readthedocs.io/en/stable/#features
• https://uds.readthedocs.io/en/stable/pages/knowledge_base/osi_model.html#uds-functionalities

Alternative options

python-udsoncan

Link: https://github.com/pylessard/python-udsoncan

• pros:
  • comprehensive documentation - https://udsoncan.readthedocs.io/en/latest/index.html
  • maintained with active community - https://udsoncan.readthedocs.io/en/latest/udsoncan/questions_answers.html
  • various connection types are supported - https://udsoncan.readthedocs.io/en/latest/udsoncan/connection.html#available-connections
  • CAN bus fully supported with possibility to extension for other buses (requires custom code)
  • possibility to configure all transmission parameters for CAN using can-isotp package - https://can-isotp.readthedocs.io/en/latest/isotp/implementation.html
  • handlers for multiple diagnostic services are implemented - https://udsoncan.readthedocs.io/en/latest/udsoncan/services.html
  • positive and negatives scenarios are handled - https://udsoncan.readthedocs.io/en/latest/udsoncan/exceptions.html
  • control over CAN Network parameters (N_As, N_Ar, N_Bs, N_Br, N_Cs, N_Cr) via can-isotp package - https://can-isotp.readthedocs.io/en/latest/isotp/socket.html https://can-isotp.readthedocs.io/en/latest/isotp/implementation.html
  • possibility to inject some errors on Transport/Network layer - https://udsoncan.readthedocs.io/en/latest/udsoncan/client.html#overriding-the-output
• cons:
  • no support for full-duplex communication (sending and receiving at the same time)
  • only Client side communication is implemented - https://udsoncan.readthedocs.io/en/latest/udsoncan/client.html

python-uds

Link: https://github.com/richClubb/python-uds

• pros:
  • CAN and LIN buses are supported
• cons:
  • very modest documentation - https://python-uds.readthedocs.io/en/latest/
  • is not maintained with the last release in March 2019 - https://pypi.org/project/python-uds/
  • only a few communication interfaces (I have only found examples with python-can) are supported - https://python-uds.readthedocs.io/en/latest/interface.html
  • no support for full-duplex communication (sending and receiving at the same time)
  • only Client side communication is implemented
  • limited communication parameters configuration - https://python-uds.readthedocs.io/en/latest/configuration.html
  • no option for injecting errors on Transport/Network layer, e.g.
    • Overflow / Wait value of Flow Status (parameter of Flow Control packet)
    • CAN packets in wrong order (e.g. incorrect Sequence Numbers order in Consecutive Frames)

Contact

• e-mail: uds-package-development@googlegroups.com
• group: UDS package development
• discord: https://discord.gg/y3waVmR5PZ