I’m currently testing the firmware from esp32-can-iot on a real vehicle

Current setup

• ESP32 + CAN transceiver (TJA1042)
• Vehicle: Toyota Vios 2007
• CAN TX/RX pins configured correctly
• DB9 / OBD wiring checked multiple times
• CAN_H and CAN_L continuity verified

What works

• Two ESP32 nodes can communicate with each other perfectly using this firmware.
• Sending and receiving CAN frames between ESP32 devices works normally.

The issue

When using this repo firmware on the actual car:

• No CAN frames are received at all.
• Even after sending OBD-II requests (0x7DF) there is no ECU response.

Questions

1. Has anyone successfully tested this firmware on a real vehicle OBD/CAN bus?
2. Could this be related to timing configuration differences?
3. Are there known issues with ESP32 Arduino-CAN (Sandeep Mistry) on noisy automotive CAN buses?
4. Is there any additional configuration needed for real vehicle CAN communication?