That’s exactly the kind of use case Xibo caters for. You’d need a CMS server running somewhere (or get someone to host that for you - there are lots of providers who can do that, including the project sponsors) plus a Windows PC or Android device attached to the TV to play back content. Android devices generally cost less and use less power but there is a small licence charge for using Xibo for Android. Alternatively you can use a normal windows PC to run it and then there’s no software charge.
Do I understand that the smart TV could not display the photos and messages via a Cat5 cable on our network? I would need an additional PC? Why couldn’t a PC run the software and transmit to the TV from anywhere on our network?
Maybe I don’t fully understand.