[werk_ag]

Often I have difficulties in express myself in English language, and sometimes surely I may seem rude or closed-minded.
I'm always opened to suggestions. Over the time, the WeatherDuino Pro2 system was benefited a lot from users suggestions.
I'm not refusing to explore anything, I just tried to say, that what you have suggested hardly can be done, unless, as you said too, a different firmware will be write. There is no RAM to accommodate the required code for the ES8266, and I'm not prepared to leave the Davis emulation (and the data logger function). I'm sure that the majority of users prefer a system with the USB connection. For most users, Cumulus is certainly the easier way to rapidly have a basic web page. Having a PI running 24h a day, costs no more than 5$ of energy per year, and the most important in my point of view, is that it allows you to store in your house your the weather data, which value increases as more years of data you have stored.
If you manage to write a different firmware to use with an ES8266 module, please feel free to share it with us.