I have bought this
It is a great and fast working board with the ATmega2560 chip, but I didn’t figure out how to use the esp8266 and the ATmega2560 with the same sketch or even two separate sketches that kinda communicate together or something like that.
Thanks for every help!
Looks like no one has experience with this board. Me too. From what I see in the product description it is two separate boards nicely packed on a single PCB. So, from the programming point of view, you should look at it as two separate modules.
Given that, you can connect the ESP8266 part to Internet and talk to it via serial using the technique similar to the Exchanging Text-based Data guide article.