@zboblamont ROTFL...
I'm kidding. This does not solve the problem. Isn't nice or exploring too.

yes, I know...but if you are still staying by given examples, you don't develop yourself ;)

...and how to connect Arduino & MySensors & ESP8266-01 (like this one: https://www.aliexpress.com/item/2015-New-version-1PCS-ESP8266-serial-WIFI-model-ESP-01-Authenticity-Guaranteed-Internet-of-things/32574207918.html?spm=a2g0s.9042311.0.0.ytiQMF ) with ESP 01 Serial Adapter - like this one (https://www.aliexpress.com/item/ESP8266-Serial-WiFi-Wireless-ESP-01-Adapter-Module-3-3V-5V-Compatible-For-Arduino/32740695540.html?spm=a2g0s.9042311.0.0.lSVdmZ), when i should use Tx and Rx signals only?