@i_grr has posted a photo with esp module and SD Cards. Any information SD Card handling (non spi mode)?

Esp would be in soft access point mode (WIFI_MODE_AP): Is it possible to redirect specific address (eg. abc.com) to the listener on the device, like the dns server would do it?

I 'd like to pass some static file to the spi memory when flashing the chip, so as to send it after client's request.
How can I add something to the project, that is not part of a code, to be able to open it with fopen?

ESP32 is still the cheapest chip that you could imagine with BT / WIFI integrated

What about certification and industrial usage of espressif chip?

Datasheet describes that U(S)ART is able to work on any GPIO, but there are some pins labeled as UnRXD and UnTXD (n is a number).
What are they for? Programming on U0RXD and U0TXD only?

esp, except XTAL_P and XTAL_N, has 32K_XP and 32K_XN pins for an external 32.768 kHz crystal oscillator. For what is it, when should I consider adding it?

Looking for an example of usage IO0/2/4/12/13/14/15 for SD Card and fat32 support