@Unixbigot battery powered.

My use case is for guest convenience.

My stuff is a whole mish-mash of stuff on different apps. Most Wi-Fi, some Bluetooth with proprietary Wi-Fi hubs. Then I've got about half (lights, fans) working with home automation scenarios. That's the stuff I want to put on buttons - for random guest convenience.

I also have tuiss smartview blinds that use Bluetooth that I'd like a button for - I've found a reddit post that gives me an option there and I'm looking at the SwitchBot mini hub which includes IR blaster - which may solve that problem. More research needed.

Mum will eventually also have the smartview blinds. But my main use case for her are "call me" buttons in case she has a fall when her phone is not nearby. A more interesting and complex solution needed there.

She doesn't really care about the buttons yet, but has fully embraced the ring cameras I gave them years ago and the eufy smart door lock more recently.

@Andrea the thing about wifi for home automation buttons is that WiFi is a battery pig³. If you don't already have a home hub that supports other lower-power radio bands, your options are either "get one¹ , build a home-assistant hub with a low-power wireless bridge, or get a self-contained bridge and some zigbee or matter buttons²". There is a saying "when setting out to install HomeAssistant, first dig two graves".

¹ I have several spare google home minis which you may have one or more of if this helps
² ikea https://www.ikea.com/au/en/p/dirigera-hub-for-smart-products-white-smart-90503407/ https://www.ikea.com/au/en/p/bilresa-remote-control-white-smart-dual-button-50617868/

³ these do work but unsure of battery life https://www.aliexpress.com/item/1005006081884094.html also https://www.aliexpress.com/item/1005010524995760.html

If you want to explore build-it-yourself no-evil-cloud options for ideological or recreational reasons, I have designed all the necessary hardware and have stock.