Turn Samsung 6 Series TV OFF

I have read through there is troubles in fully integrating Samsung TV’s currently into ST,
All I want to do if turn mine OFF if my motion sensor hasn’t sensed motion in a set amount of time.

should be easy ? I do it with my yamaha surround receiver

I have a Smart Plug that my TV is plugged into.

That’s your alternative option.

or get an IR blaster like a harmony hub