Unfortunately the author of “Something Left Open” doesn’t seem to have contact information on the Community (see link below); and I can’t find their code in the SmartThings-Public GitHub (a great place to find SmartApps).
Depending on how complex your requirements actually are, however, this is a relatively simple SmartApp to write if you are interested in learning to write SmartApp(s)! There are probably several existing SmartApps that are similar as starting points, but it does take some time to explore to find one.
I’ve done 1:1 Skype sessions for a few bucks if you want to walk through writing such a SmartApp…
But … a half-dozen folks here will volunteer to write one for you in the next couple of hours…