Centralized WebUI on node-red with multiple raspberry pi

I have a question regarding node-red, before jumping on it. I find a big difficultly to get a home-automation tool such as node-red, to get working multiple raspberry pi nodes.

On the master I use django(brain)+angular(web-ui)+pigpio-library to interconnect the master pi with slaves. Basically using pigpio I can send from the master turn-on or turn-off signals to slave without any other tool.

In my home configuration, I have 3 raspberry pi.
All 3 are connected to the same network.
1st pi is master and the other 2 are slaves.
2nd and 3rd raspberry pi are slaves, and only have pigpio service installed
this give me centralized interface to n pi`s connected to my network
downside it that our app is not yet able to do complex things:events, tasks, etc. So if I want to connect a PIR to my master and based on this trun on a LED on slave`s gpio, I cannot!

In node-red or home-assistant, both use mqqt to send or receive information regarding sensors or manipulate gpio`s.

Can I have with node-red a centralized interface installed ok master pi, and from there to act upon a gpio on slave pi?

thank you George

Solution

You can use the node-red-node-pi-gpiod node on a central Node-RED instance to control GPIO pins on remote pi's.

You just need to make sure that pigpiod is configured to listen on the external interface and that the firewall will not block access.