I am interested in exposing home appliances to HomeKit or HomeAssistant–>HK. These are all cloud connected Samsung appliances (washer/fridge/etc.). I am not aware of a local integration available.
I have looked at using the SmartThings/HomeAssistant add-on but that integration requires exposing HA to the internet with port forwarding or tunnels. Homebridge looks decent, but doesn’t seem to support appliances.
The only thing I can think of is to create a driver that allows you to create virtual HomeKit devices that run on the ST hub and then create automations to mirror the physical devices.
Any other options? That last one is a heavy lift just so I can create a washing machine automation
If you can connect SmartThings to Google Home you could then use a Starling Hub to connect your devices to Homekit.
Starling Hub connects Google/Nest devices to Homekit and now all devices in Google Home as well, so I have all my SmartThings devices in Homekit via Google.
I am not sure what would be exposed by Google as a trigger to create your routine as I don’t have a Samsung washing machine.
Another option could be Homey. I’ve used their SmartThings integration to control my Samsung TV. With a Homey Pro hub (or the cheaper, recently announced Pro mini) you should be able to expose those devices to HomeKit, but I haven’t tried that myself. The benefit over HA would be that it doesn’t require a subscription if you have their hub. You would have to trust Homey (i.e., LG) with your devices/data, though.