@bigcalm Smart home protocols and standards are a total mess of walled gardens and interop issues.
Zigbee and ZWave devices are fairly well standardised and talk locally but you need adapters. It's also not uncommon for devices to require a manufactures hub to update.
For WiFi connected devices there are no widespread standards that I'm aware of and it's very much down to the manufacturer's design.
@intrbiz Found "SONOFF Universal Zigbee 3.0 USB Dongle Plus Gateway with Antenna for Home Assistant, Open HAB etc." on Amazon for £27.29.
Might be worth a punt, and see if it'll play with any of the devices I already have.