homeassistant

ZigBee devices are probably the obvious choice. You'll need a ZigBee dongle which acts as a controller, then HA can talk to all the devices.

Nearly all Zigbee and Z-wave devices JUST WORK or are very close as long as you just double check they are on the compatibility lists. They are also fully local, mature and have devices from switch / hardware makers that are reputable in making switches and outlets. (unlike most wifi devices)

I would also suggest matter devices but that is still beta in home assistant and too EARLY to say anything about the quality of devices that support the limited 1.0, 1.1 specs.

If your in the market for WiFi stuff, shelly is my go-to. They have local access, ha integration and even mqtt if thats your bag

I'm a big fan of tasmota and esphome. There's plenty of cheap esp32 devices that you can flash these onto and all will work via regular old wifi.

Zigbee, Z-wave, and Matter all should work, but they need special radios that require extra hardware on your server (except sometimes Matter—some devices use WiFi, while others use Thread, which is based on Zigbee). SkyConnect gives you Zigbee and Thread. Homekit usually works too, but at this point it's better to get a WiFi Matter device. Anything running ESPHome will work automatically. Athom has a lot of products that are preflashed with ESPHome, so the firmware is designed by the same people that make Home Assistant.

I don't know of a good list, but if you start looking through the integrations on the website, what you're looking for is "Local Push" or "Local Poling". Local Push is better.

I have a bunch of WiFi devices flashed with Tasmota. If you're handy with a soldering iron (arguably optional but makes it a little easier), you can stock up on Sonoff Basic switches and flash them. The stock firmware doesn't work with HA. The Tasmota website lists a bunch of devices that it works on. ESPHome is a similar project.

Going this route isn't quite "just works" since there's tinkering involved, but there are other, more expensive options. Shelly is a popular brand but I've never used one.

I've used TP-Link Kasa switches/outlets before and they work well. I believe in recent years they've disabled the ability to turn off cloud features, meaning you have to be ok with them having access to the devices, or you can block them with a firewall rule. Local control still works either way.

I also use a lot of z-wave switches, mostly from Zooz. If it's going inside the wall, I want it to be certified for that purpose so I'll pay extra for the safety.

Finally there's HomeKit. If you're device supports it, you can have local control. Just set the device up using HomeKit instead of whatever cloud polling option there might be available. This might be an option for Tuya, for example.

As far as “just works” get something that is directly integrated with home assistant and IMO if home assistant has direct access to the radio or method of communication, the better. As others have said both Zigbee and ZWave devices can interact directly with HA using a dongle and I do so with a VM on Proxmox and it works great, I do however think the ZWave JS and ZWave JS UI integrations are far and ahead of Zigbee ZHA integration (I won’t speak on Zigbee2MQTT as I don’t use it)

Wi-Fi devices are nifty but their reliance on the strength of your WiFI, internet connectivity, DHCP working, IPv6 support make them more variable than the ZWave and Zigbee standards that really just require you build a good mesh by having devices every so often that each other can “relay” through.

IKEA tradfri stuff

I've had very good success with Zigbee stuff, TP-Link Kasa outlets (but I've put them on a different router / subnet that doesn't have Internet access), and ESPHome.

Tuya stuff sucks (keeps disconnecting), JuiceBox (my car charger) changed their app so the integration doesn't work anymore, and the Aqara zigbee door sensors never worked for me (they pair perfectly, but then disconnect and never come back on).

So yeah, in my experience, once it works, it works, as long as there's no cloud involved.

I'm happy with my ESPHome (maintained by the same entity as HA), Shelly (cloud is optional), and Caseta system. I'm glad everyone else is happy with their dongles but I didn't want that. 2.4 ghz is crowded enough as it is.

Wyze natively supports Google Assistant. If you are a HK user you can set up Homebridge and use the "homebridge-wyze-smart-home" plugin which supports a lot of Wyze devices and is regularly updated.

I'm going to pontificate a bit.

I get the impression that there just isn't quite as much "just works" on offer as there use to be. In the 3ish years I've been playing with HA I've seen several of them vanish and not return. This has gone hand-in-hand with "improvements" in IoT security.

Personally I have no problem with insecure APIs on my local network. But I'm 20 years out of date, the threat landscape is infinitely more vast and people I've never met are looking to fuck my shit up for a fraction of 1 bitcoin ;-)

Secure local access shouldn't really be a problem, but ultimately it will always require a non-zero amount of maintenance. Either from you (if you're lucky) or the manufacturer (if they're still in business).

Working off all that Zigbee is probably going to be your best bet. It just works pretty good, but I have yet to find a list of all the basics that always work perfectly for everyone. But most of it is cheap and plentiful enough that you can just try another device if needed.

Some folks seem to get away without repeaters, some don't. So repeaters and devices don't seem to be compatible, and that makes the notion of a self-healing automatically optimized mesh more of a theoretical ideal. Start with small test deployments and scale up gradually. RF isn't easy, there's going to be glitches. Devices with a graceful fallback are good... every bulb in your bedroom coming on at 3:00AM when the power hiccups may be an acceptable compromise to you, but might not be for the person you're sleeping next to ;-)

And this has devolved into barely coherent rambling, so I'm out. Sorry I couldn't answer your question, but hopefully I don't completely waste your time.

As everyone else said, basically, don’t get WiFi devices - they generally expect to be cloud controlled and call home. I suppose that’s fine for people who don’t want to set up a hub, but even then would be a hassle unless all your devices are from the same brand.

Look for an open standard local-only network protocol, starting with Zigbee or z-wave. Could also try Thread, Bluetooth, or a couple other choices, but they might be more involved/limited.

If you’re using HA, spend $30 on a dongle to get a transceiver for whichever local protocol you use, and you’re good to go. Actually with HA, you don’t need to be limited to one, but I would start with one for your sanity

I started with z-wave, because that’s where I found the most devices that I wanted (light switches) in my area. However at this point I have equal number of Zigbee and z-wave. Actually all the Zigbee claim to be flashable to Thread, which is why I chose them.