Switching on and off a relay as a beginner with mqtt

[vzorglub (Vincent Regaud)]

@JJdelfino

How do i know for example the path to write in the Items file ?

Introduction - Items

@JJdelfino

First of all i am not quite sure how to make my esp 8286 communicate with my raspberry.

https://www.baldengineer.com/mqtt-tutorial.html

@JJdelfino

)I created a switch item but i don’t know the mqtt path.

It’s not called a path but a topic:
You create it yourself eg: House/LivingRoom/Switch

See:

MQTT Binding (v1.11) Getting Started 101

After countless threads regarding initial configuration issues, here is a short guide on how to get started with MQTT, the MQTT binding and openHAB. This thread is a wiki article and can be improved by everyone. Please do! MQTT is a machine-to-machine (M2M)/“Internet of Things” connectivity protocol. It was designed as an extremely lightweight publish/subscribe messaging transport. A few resources first: Read all you ever need to know about MQTT in the MQTT Essentials The openHAB MQT…