I am far from being a computer network specialist, but I learn a little bit at a time.
My goal is to dialogue between Arduino with MQTT via Mosquitto installed on a raspberry.
But if it works in localhost, this is not the case in the local network like for example with ‘MQTT Explorer’ on Windows or connection sketches in Arduino.
No way connect to the server. I disabled the firewall of the Asus RT-AC88u router and I do my Ethernet tests.
I installed it on another PI ‘virgin’ and I have the same problem.
It’s been a week that I turn around and lots of tutorials seem to copy each other but without examples or clear explanations.
Not to mention that I do not control English and that translators are sometimes approximate in the technical fields …
A big thank you in advance!