The MQTT items are a mixture of Tasmota flashed Brilliant, Arlec and Kogan plugs, switches and ceiling fan controllers.
Pretty much all of my lights are Yeelights, but I have also some flashed Arlec and Brilliant bulbs (Tasmota/MQTT) and some led strips that use the Flux LED component.
I have a few TP-Link plugs, a few WeMo switches. Total is over 50 WiFi devices, excluding phones, laptops, TVs etc.
Sure am, in Brissy also 
Have to try some of these… Really fed up with the Tuya integration - just tested: It’s really currently the integration (once again) causing issues, the Tuya cloud API works fine - can switch all my switches from there - but in the Tuya integration 50% of my devices don’t work properly
The new Tuya integration is causing lots of problems for many people.
It’s super difficult to find any Tuya products these days you flash with Tasmota as they have updated firmware and/or an un-flashable chip.
As far as decent quality locally controllable WiFi items go, Yeelight and LIFX bulbs work well as do TP-Link bulbs and plugs. If you are using older Tuya devices that you’ve owned for over a year, you may be able to flash them with Tasmota.
You can also get a decent range of Zigbee and Z-wave items as well if that’s something you want to get into.
Do a search here for TP-Link issues before you go that route. Most of us who have them will never buy another. Long story short: the manufacturer is hostile to local control.
Aus doesn’t face this issue, local control works without issue to the best of my knowledge.
Bit late to this party but I found my Bluetooth devices to be useless. I have two tap timers in the garden and two Clipsal Bluetooth 240v switches (before they added Zigbee to their units).
I have to be no more than 5 metres from each device to use the Bluetooth so unless I am changing parameters, I can just reach out and do it manually…. except the tap timers don’t have a manual on/off button. And of course, I cannot integrate them into my HA. My view is avoid Bluetooth.
I tried it and it worked for me, but I wanted to avoid the cloud, so I have quite a few things on TuyaLocal and it is working for me. I haven’t isolated all of them from the internet yet, but those I have are working fine.
It is a bit tricky setting things up if they have multiple sensors/ID points - working out which sensors are which is not immediately intuitive. I found integrating the switch and then looking at the state tab in the developer menu virtually confirmed what I was looking for and made it a bit easier.
I’d still prefer Zigbee, but haven’t been able to find a Shelly-like Zigbee device that is Australian approved. I don’t want to changeover my switch plates and have a mix and not quite match display in my house, so Shelly is looking more attractive.
As I’m so fed up with the regular Tuya integration I’ve just switched to LocalTuya today. It’s lightning fast in comparison and works fine.
As mentioned by @kanga_who setting up the integration of current/power/voltage sensors is really tricky as you have to manually check all ID points.
I’ll probably switch to Tasmota some time as I’m still not a fan of granting Tuya in China access to my data. Currently I unfortunately don’t have the time for the tinkering with the firmware upgrades…
You could setup a VLAN, move all of your IoT devices to it, and block internet access assuming you have network equipment that can do it.
I’m afraid that’s beyond my knowledge horizon 
but thanks for the tip anyway
It’s pretty simple. Search on YouTube, you might surprise yourself.
