So If I have mosca mqtt broker node on my node-red flow that means that it only can be used inside node-red’s flow to test commication iinside node-red’s flow and node-red dashboard, for example display a text and that’s all? I don’t really understand I just assign all the values to my localhost ip of my computer. I thought that I can use my localhost ip to a mqtt broker server and test my mqtt commuciation with esp with my local mqqt broker server on Windows PC with mosca_broker node. I haven’t found any tutorial how to do it on YT. Everyone has RPI as a broker haha 
edit: So I got to instal Mosquitto mqqt broker on my PC: How to Install The Mosquitto MQTT Broker- Windows and Linux and then in node-red’s flow in Mosca_broker node put my IPv4 address of my computer on Server attribute and so on?
edit: I mean mosca_mqtt_broker node doesn’t work like mosquitto mqtt broker installed on my PC or RPI?