MEGA+WiFi R3 ATmega2560+ESP8266

Hello, coud You help me. I have this: MEGA+WiFi R3 ATmega2560+ESP8266, flash 32MB, USB-TTL CH340G, Micro-USB I do everythink by instructions: https://robotdyn.com/mega-wifi-r3-atmega2560-esp8266-flash-32mb-usb-ttl-ch340g-micro-usb.html I havent this option: ESP8266 Sketch Data Upload If if try upload normally then i have error: serial3 was not declared in this scope What i can do it ?

kubaszy: If if try upload normally then i have error: serial3 was not declared in this scope

That's because the "test sketch for ATmega2560" is written to run on the ATmega2560 on your board, not on the ESP8266.

RobotDyn's documentation is just really bad. The information above that sketch contains instructions for uploading to the ESP8266 on the board. Then they switch to a sketch for the ATmega2560 without warning. Even the ESP8266 instructions are terrible because they are extremely outdated. For years now it has not been necessary to use the Tools > ESP8266 Sketch Data Upload plugin to upload to the ESP8266. You can just upload to it by clicking the Upload button just like with any other board.

I need help with MEGA+WiFi R3 ATmega2560+ESP8266, flash 32MB, USB-TTL CH340G, Micro-USB
I have to make communication:
Arduino - ESP - mysql
mysql - ESP - Arduino
I looking for someone who can help me.