Another update to my issues with sending frames (Tx) from my ESP32. I came along exchanging the Transceiver SN65HVD230 (CJMCU-230 - Devboard Ali-ordered) with a some SN65HVD232 chips. This solved the issue for me~! I have stable CAN Rx/Tx now on my very same test setup (it really slept there for the...

Thanks to mention it. I cross-checked on that one with a 3.1A mains adapter (rather than USB3 desktop-pc socket). The result was a little less reliable with the mains adapter (lolin Wroom, 2.6pullup, no transmit at all (mains) vs a fail after some 25 transmits on the desktop socket supply). I also c...

Here is my update on utizlizing SN65HVD230 (or more correct a CJMCU-230 one-chip board): After consulting a friend with an oscilloscope we found some not well formed signals (as also stated on other web-posts). On the oscillospe the output on the CAN side was only seeing roughly 1.5V but most probem...

Thanks a lot ESP_Dazz and jcsbanks, your replies arrived timely and gave me the opportunity to think about the next steps. my regards~ :P Surely I will keep you informed~ However - so far - I did not find much time to dig into all these side branches. In addition to your mentioned root causes I thou...

Bit more info after playing all afternoon. The Tx pin is connected to the tranceiver from pin on ESP32 Devkit C to pin on the tranceiver chip, but the ESP32 cannot transmit. Pulling either Tx or Rx connection from ESP32 to tranceiver stops reception. The ECU only sends a single packet (but repeated...