Start with ESP8266 and ESP32

Which to choose? ESP8266 or ESP32

Official Flash Download Tool for ESP8266 and ESP32 attached (latest version 3.6.7). Works only in Windows environment .

ESP8266 .
Portal about everything: http://esp8266.net/
Description of pins Module overview Beginner's manual
Book by Neil Kolban (enclosed). A must-have and free item .
Documentation of SDK Firmware AT Commands AT
Arduino .
Installing the board manager Documentation of the Arduino HAL
Library compilation .
Programme examples:
http://www.electronicwings.com/nodemcu/arduino-ide
https://github.com/esp8266/Arduino/tree/master/libraries/ESP8266WiFi/examples
LUA Documentation Documentation[/url]
MicroPython Documentation Documentation[/url]

ESP32 .
Portal about everything: http://esp32.net/
Description of pins Module listing
Neil Kolban's book (enclosed). A must-have and free item .
Documentation SDK .

Arduino .
Installing the board manager Documentation of the Arduino HAL
Library compilation .
Programme examples:
https://github.com/espressif/arduino-esp32/tree/master/libraries/WiFi/examples
https://github.com/espressif/arduino-esp32/tree/master/libraries/ESP32/examples

FreeRTOS
Documentation .
Programme examples:
https://techtutorialsx.com/2017/05/06/esp32-arduino-creating-a-task/
https://github.com/espressif/arduino-esp32/bl...ibraries/ESP32/examples/FreeRTOS/FreeRTOS.ino
http://www.iotsharing.com/2017/09/arduino-esp32-freertos-tutorials.html

xeank wrote:

This results in different settings for programming under Arduino when theESP8266 modules are mounted on the boards

.
This is not true. The difference between the ESP8266EX and the ESP8266MOD is that the former is manufactured by Espressif and the latter is, or rather was, manufactured by AI-Thinker. Functionally, there is no difference. There is no hardware I2C controller in the ESP8266, and all communication is over I2C is done by software.

xeank wrote:

see: https://www.elektroda.pl/rtvforum/topic3663561.html#18503329] xeank.

.
This thread has nothing to do with processor designation, but is about software pin setting for the I2C bus.