thank you for the reply
I will check it out :D

I was working on a simple code to test boot process, interrupts, vector table all that kind of stuff
and I made it work. But when I was studing the wifi I run into this wifi init that need a lot of callbacks
like this struct "wifi_osi_funcs_t g_wifi ...

Hi,
im using esp8266 since 2017, and after the NON_OS_SDK_3.0.0 all my projects works fine.
But I only use the precompiled files ".a" and they respective ".h" files, the rest of things I did myself as always.

I need to agree with "sanpei" on the esp32 SDK, just to turn on a PIN there is so many ...