Thank you,
I will try apply steps from you..

Hi, I spent lot of time but I still don't found good answer and Wiki are old without required info. I want to use arduino's analog inputs, measure values, make calculations and push it trough ESP to Domoticz MQTT but I still don't know how to do it.. how to make good serial communication.. for examp...

Hi, I have a suggestion - sending signal level to domoticz via json url request. It is required ,just add parameter &rssi= and value from 0 to 11 Will be required, do some calculation between WiFi signal level and domoticz signal level source: http://www.domoticz.com/wiki/Domoticz_API/JSON_URL%2...

Yes, I thinked about posibility to use GPIO01 and GPIO03, same as each other GPIOs.. Not only for I2C. In HW page will be setup, and after reboot will be disabled Serial output if one of pin have another setting then Default. I wanted to just hard change It in code, but this setting is deeper in ESP...