I originally started down the path of controlling my 2011 Samsung TV over ExLink (RS232/Serial) by running a small python web server on my HTPC connected to my TV. The 2011 series Samsung TVs had decent TCP/IP support except for Power On which is why I went down the ExLink route. (here’s the python library I wrote)
I ended up breaking my Harmony One partially through the project and replaced it with a newer Harmony remote with home automation capabilities (eg. integration with SmartThings).
I don’t really use the integration from SmartThings to Harmony and as you might have seen in other threads apparently it isn’t working for many people right now. I primarily just use it to shut down the home theater system if I forget to turn it off at night and I usually just pop open the Harmony app for that.