ATTiny would definitely work. Ive use them for really really long timer systems with some trial and error.
You should maybe just look at a bigger battery depending on what lifetime you would expect? They are not exactly super low power(at least the ones I have used)
Something weird happened... So I edited my comment: Ive used those exact relays, 3 in a single prototype that I was tinkering with quite a lot, so what worked best for me in the end was mounting a DIN rail into my enclosure (Any box would probably work for you? I needed IP65 so I used a proper box with glands for incoming wires.) And then the relay boards were hot glued to DIN rail mounts... (The relay boards are then lined perpendicular to the DIN rail) That ensured that I could add or remove the rails as needed.
The rest of my circuit is also mounted on another DIN rail... Also allowing me to swap out main boards as I programmed/ upgraded them with minimal effort.
This was all connected by DIY 'ribbon cable' so that plugging and unplugging was also a breeze..
Granted this all might be overkill for you? Ive also have had projects that still live in shoeboxes and they work but obviously it all depends on your use cases?
Just remember, if you go the box route, to make your life easier, make sure the box is big enough to work in if anything is to be mounted permanently. Its a massive headache trying to feed one wire past all the others into the hole if you are working 20mm from the edge of your box.
Hope this helps!
(Second edit):
I read like my arse... If youre installing inside the switchboard and already have din rails, then a rail mount would be the most convienient solution
I added this to my .zshrc after getting weird formatting in manpages. I do use bat as a my pager though so not too sure if it will help.
export MANROFFOPT='-c'
Awesome thanks. Thats pretty much my setup so Ill definitely give it a go
Do you use it as a docker container or the full Home Assistant OS?
I want to get it to play around but cannot really justify buying a separate raspberry pi jhst for HA?
Damn just commented the same experience lol
My pin is also a pattern, recently I paid at a restaurant, and they had a card unit with a touch screen, I suppose for fingerprint reasons; the numbers on the pad were randomised.. took me quite a while to remember what my pin number was in tge end
Just log into your routers admin panel and see if there are any online devices online that arent yours? That would be my goto because then you can just block them from the panel?
otherwise via linux cli you can do arp-scan and youll see online devices in your subnet. Theres also a few options to scan different interfaces