You may indeed be overflowing the stack of the FreeRTOS timer task as you are doing some heavy operations in the timer callback I suggest to perform WiFi initialization and the actual OTA in a dedicated task with 'enough' stack space.

Thank you. Since it was a relatively easy problem, I solved ...

I'm currently using ESP-IDF inside VSCode, and I'm trying to implement OTA over Wi-Fi.
To test this, I'm doing a simple OTA that changes the LED blink interval.
However, I'm facing a panic issue due to a stack overflow. I think the problem is caused by having too much code and trying to implement ...