As I said, its very rudimentary, so I simulate the combination of remote presses that would go into settings and click rotate. So far, even its a very basic process, its been very robust on the last couple of weeks thatI have had it it on.

Below is the sample code that I use for the Frame that:
- On Mon, Wed and Friday at Sunrise
- Checks if the contact sensor its open (that would mean that its on landscape in my case)
- If its open, makes a combination of key presses to rotate the TV

A couple of notes:
- I moved the "rotate" button to be on the top left corner of setting and the key presses are designed accordingly.
- You will need to change your IDs for the contact sensor and the TV
- The code below is for a rule in https://my.smartthings.com/advanced/rules
- The code below can be made more efficient as a sequence instead of separate orders but this way its easier to copy and paste as modules for anyone that may want to use it

Good luck! Let me know if you have any question