I just noticed that in the 'What's New?' section on the LANnouncer website, it says that playing a file has been added...
Version 2.03.12 brings:
Audio Files - select files to play
my original post below
Joshua just posted exactly this (OK, not using this system, but using Tasker & SharpTools) just two posts before yours above...
Tasker is an automation app that you can use on Android.
SharpTools is a system (including an app for Android and a SmartApp in SmartThings) that allows us to integrate Android devices with our SmartThings systems.
I have these working in conjunction with other tools and tricks to get my wall-mounted control panels (running SmartTiles) to turn their screens on when I walk up to them.
Now though, after seeing this comment from Joshua, I'm going to revisit this concept, and see how well it works compared with using LANnouncer.
I can imagine there may be situations in which I may want to use one and other situations where I may want to use the other. Having options like this is HUGE!