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ISO-TP Echo Example

Simple ISO-TP echo service: receives data and sends it back. Supports single-frame and multi-frame transfers.

How to Use Example

Hardware Required

  • An ESP32 development board
  • A transceiver (e.g., TJA1050)
  • An USB cable for power supply and programming

Configuration

Use idf.py menuconfig to configure the example:

  • ISO-TP Echo Configuration → TWAI Basic Configuration:

    • TX GPIO Number (default: GPIO 5)
    • RX GPIO Number (default: GPIO 4)
    • TWAI Bitrate (default: 500000)

  • ISO-TP Echo Configuration → ISO-TP Configuration:

    • TX/RX Message IDs (default: 0x7E0/0x7E8)
    • Buffer sizes

Connect the ESP32 to a CAN transceiver and the CAN bus.

Build and Flash

Run idf.py -p PORT flash monitor to build, flash and monitor the project.

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

Once the application is running, you will see the following output:

I (xxx) isotp_echo: ISO-TP Echo Demo started
I (xxx) isotp_echo: ISO-TP echo example's TX ID: 0x7E0, RX ID: 0x7E8

To test the echo functionality, you can use a tool like can-utils on a Linux machine connected to the same CAN bus:

# Send a message and wait for the echo (using default IDs from Kconfig)
candump -tA -e -c -a vcan0 &
(isotprecv -s 0x7E0 -d 0x7E8 vcan0 | hexdump -C) & (echo 11 22 33 44 55 66 DE AD BE EF | isotpsend -s 0x7E0 -d 0x7E8 vcan0)

Troubleshooting

For any technical queries, please open an issue on GitHub. We will get back to you soon.