Thank you very much for great explanation!!!
But is there a way how to connect ESP8266 to Controller. In MySensors are available just ethernet or serial gateway with NRF. Of course I can connect ESP to NRF and then use serial gateway but then there is no difference if I use ESP or nano.
My idea is that I want to use wireless network for sensors. One of my sensor should be LCD/TFT with touch so I wanted to prevent to use NRF (it occuy SPI)