openHAB, MQTT, souliss, H801WiFi, wemos & ESP8266 Device

Hi, I’m a newby in this world.
I need help to understand how configure my smarthome system. I would control it with openHAB UI (I’m going to install openHAB2 on Raspberry Pi 3); my smarthome system is made by:

I read a lot of internet, I read a lot of about openHAB, about bindings, about MQTT (in particular Mosquitto Broker), about souliss…but I’ve a lot of confusion in my head :confused:

My idea is control my IoT items with openHAB but I don’t know how to communicate with them :frowning:

Can anyone give me some advice how to configure my smarthome?

Thanks, rodsmr