I have a Sonoff mini set-up so it is blocked access to the internet on my router. The device goes into Lan mode on the Ewelink application. I can activate the mini from the Ewelink app without using the cloud. I set-up a virtual device and IFTTT to turn on the mini.
I thought this would be a way to not use the cloud servers. See youtube below.
I cant get the Smartthings virtual device to turn on the mini when connected in Lan mode.