eBUS Adapter Shield v5 and hardware extensions (a button and SSD1306)

[mateuszdraco]

Hey,

I have my shield v5 and it works well, I can manage my Vaillant heating system via Home Assistant. Now, I was wondering if I could add a simple manual trigger, to heat up running water on demand. I already have that functionality in the HA itself, but in order to use it I need to reach out to my phone (or access HA somehow).
I read the pin-out documentation and I was able to prepare a push-button assigned correctly, additionally I wired SSD1306 to be able to display some data about the heating system. I know the SSD1306 works correctly as I was able to use i2cssd command in REPL and it works.

Now, my questions are:

1. How to handle an event of the push button?
   • I would like to change some settings on the heating system, so maybe it would be easier to send the event to HA and handle it there?
   • But at the same time, how to send such an event from the shield?
2. How to send some text from HA to the shield to display it on SSD1306?

I tried to find any documentation about it but with no luck unfortunately.

Thanks, Mateusz