Seems my problems with I2C stability pretty much disappeared when I switched to use ESP32 arduino branch from 'stickbreaker':
https://github.com/stickbreaker/arduino-esp32

I guess the problem would have disappered with switching from Arduino to ESP-IDF...

thanks for the reply sellonoid! Did you have a temperature sensor or something else hooked up to the sparkfun chip's gpio's And if you did, did you power them from the chip or with own power supply? I'm starting to think that the problem is with powering the used bus with the ESP chip's 3v3 pin... I...

HI! Exactly the same as what I've observed. And I've tried several different sketches with various different ESP32 versions (also ESP8266). And with sensors connected to one-wire and I2C bus. Sketch keeps running for a few days then freezes. Something broken in the ESP Arduino implementation perhaps?

Hi, I've done several experimental Arduino sketches to evaluate if the ESP32 or ESP8266 would be suitable for a long-term home-automation sensor node purpose. i.e. the ESP would have DHT22 or similar attached, would publish the date via MQTT, powered via USB power supply, etc... But, with several ES...