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J1939-Utils

Python utilities for interacting with J1939 and J1939 networks.

Description

J1939-Utils is a collection of Python utilities designed to facilitate communication and analysis within J1939 networks. J1939 is a protocol suite commonly used in heavy-duty vehicles, providing a standardized way for electronic control units (ECUs) to communicate over a CAN bus. These utilities aim to simplify tasks such as message filtering, streaming, and graphing, making it easier to work with J1939 networks.

Table of Contents

Current Utilities:

get_pgns.py

This utility filters messages in a candump file by Parameter Group Number (PGN) and prints them to the standard output.

Standard Usage:

get_pgns.py log1.candump 61440

stream_msgs.py

This utility streams received messages on a bus to the standard output in candump format. It can be attached to a virtual bus or a PCAN adapter.

Standard Usage:

python stream_msgs.py pcan

to save to a log file:

python stream_msgs.py pcan > log1.candump

graph_log.py

This utility graphs messages in a log file by address and can also print out messages that contain specific PGNs of interest. It relies on a collection of parsers, so it should be run from the cloned directory.

Standard Usage:

python graph_log.py path/to/candump 61440

Sample output:

NAME messages seen by src address:
{}

Breakdown of messages in log
src     da      pgn     msg_count
=================================
0
|-------|
        255
         |
         |--- 61424
         |      |---- 25
         |--- 68247
         |      |---- 5
         |--- 65570
        18
         |
         |--- 0
         |      |---- 2
24
|-------|
        255
         |
         |--- 65235
         |      |---- 3

Installation:

To get started with J1939-Utils, follow these steps:

1) Set up the repo

git clone https://github.com/jLevere/J1939-Utils.git
cd J1939-Utils

2) Set up the virtual enviroment

First, create a virtual environment called venv:

python -m venv venv

Then, activate it:

  • On Windows (PowerShell):
./venv/Scripts/activate.ps1
  • On other platforms:
./venv/bin/activate

Install the required libraries:

pip install -r requirements.txt

3) Finish

Your setup should now be complete. You can verify functionality by trying to start a virtual listener with:

python stream_msgs.py

Usage:

Here are some common use cases for these tools:

Example 1: Filtering Messages by PGN

You can use `get_pgns.py`` to filter messages in a candump file by PGN. For example, to filter messages with PGN 61440:

get_pgns.py log1.candump 61440

Example 2: Streaming Messages

To stream received messages from a PCAN adapter and save them to a log file

python stream_msgs.py pcan > ECU_CAN2_log1.candump

Example 3: Graphing Messages

To graph messages in a log file and specify PGNs of interest:

python graph_log.py path/to/candump 61440 65235

Running this command will generate a comprehensive graph in the standard output, providing insights into the messages observed on the bus. It also identifies NAME messages, giving you valuable information about the number and types of controller applications connected to the network. In this context, a controller application refers to a specific network function.

Configuration

To configure get_pgns.py, you can utilize a get_pgns.conf file, which should follow a JSON structure with two essential fields: path and pgns. This configuration file simplifies repeated usage.

Example get_pgns.conf:

{
  "path": "log1.candump",
  "pgns": [61440, 61447]
}

In this example, the path field specifies the file path, and the pgns field contains an array of PGNs to filter for.

Notes:

I like the candump format for logs and messages therefor most of these utils use it in some form. Candump is roughly as follows:

(timestamp as float) channel can_id#data

example: (1553794338.014188) vcan0 0C20130B#FCFFFA77FFFFFFFF

License

This project is licensed under the MIT License. See the LICENSE file for details.