During my last visit to Italy I bought a few smart items
First some smart adapters for sockets by Meross, which I returned because they were of non use to me.
Just to be clar, something like this. And the reason was that these were compatible with AppleHome, but they kept losing configuration (a known issue... known once you've bought them and desperately scrambled for advice on the internet, of course).
Then a couple of smart switches for air conditioning splits to monitor A/C consumption in our STR, and a contact door sensor to monitor when the STR door is open/closed (just in case someone makes copies of the keys and access the unit after their checkout).
1pc WiFi Power Consumption Statistics Switch, 16A AC 90-250V, Tuya/smart Life App, Supports Alexa, Google Home Voice Control, Timing Function, Power-off Memory Setting, Status Feedback, Real Time Power Consumption Monitor - cost was about $12 each.
Besides monitoring consumption, I can also turn it off (but not turn it on!)
The contact sensor was about $10 and it is battery powered
All managed by a Tuya ZigBee 3.0 gateway that cost about $25
On Saturday, a technician came to install the A/C smart switches, whereas I was able to install the door sensor myself.
Through the Smart Home app you can set rules, for example to turn off A/C at a given time or when some condition happens.
I must admit that I am out of $100 just for the fun of it. I still fail to see how it make me smarter to install these things.