DevKitC with ESP32-WROOM-32 (from https://gojimmypi.blogspot.com/2017/03/jtag-debugging-for-esp32.html):
Without DevKitC (from https://randomnerdtutorials.com/esp32-pinout-reference-gpios/):
For WROVER, GPIO16 and GPIO17 on the devkit board is not connected, because the chip uses it for something else. (From https://www.instructables.com/The-Incredible-ESP32-Wrover-From-Espressif/):
