I’m often asked about setting up MQTT, Node-Red etc. on the likes of Raspberry Pi, NanoPi or similar, with a view to controlling ESP8266 devices.
Novice readers start here
Usually it is difficult for me to see this from a beginner perspective, but having spent 2 months in hospital thanks to an untimely stroke from which I’m still recovering, 4 months after the event, I recently found myself doing new installs without the benefit of doing this stuff every day. I am just SO glad I blog everything.