Update your idf it was fixed recently

Its interesting, but possible there is no correlation between the white dot and performance. There could be white dots out there with poor performance. There are also blue dots and yellow dots. Are they all the same module or do you have some wroom-32-D? If you post the Mac addresses it may help ide...

@Besmir.likaj post your router firmware and hardware version information and if possible ask mysa what esp-idf version they use

Data is copied out of hardware fifo into ringbuffer when ringbuffer is full (threshold) or when frame ends (rx line idle).

Smarter to use rmt peripheral

The only things that run during flash write are IRAM interrupts. So the buffer will have to be big enough to hold all the data received during the flash write. Maybe you want to make sure the can interrupt is on a different core from the flash write. Using can hw filters could help. Or custom can is...

The best way is use an expander that has a built in led driver

If the binary is the same and you fully erased the flash then it could be a hardware rf problem. There was a report of a bad capacitor issue on this forum but I don't think there was any official statement about it.

It should be either 32 characters long OR NULL-terminated, but I haven't tried.

https://github.com/espressif/esp-idf/issues/3762