Can all pins be used when using WiFi?

[OSCPUDEV]

@hajotha, I would recommend posting your code. This could be something to do with the ESP-IDF conversion for the Arduino core. It seems that most everyone here that works for Espressif has very little knowledge of the Arduino implementation, which is understandable as that is not their project. There are a lot of differences and quirks that I have seen myself.

[OSCPUDEV]

@lesept, have you confirmed that you have the proper size pull-up resistors on SCL and SDA? This is not optional. You only need one set of resistors (2.2K to 10K, with 4.7K being nominal) per I2C channel.