Stream audio from PC to smartphones?
I have a complete solution stack for you:
- You should use an OpenWRT router to build a captive portal (all http could be redirected to your url -> your audio streaming pc)
- A VLC is able to stream your content as you want. If you want you could start the stream from command line.
In my experience this kind of VLC stream is the most effective one, it has almost 0 delay compared to other solutions (I tried gstreamer). If you really would like to stick with Java you are able to use VLCJ which is a nice solution too.
Extra: also with VLC you could set up a camera in front of your house to show that in your stream too!
Your diagram suggests that each device would be on your local WiFi, which means the guests would need to join your network. That means they would need to know the SSID, there would be no need for a passphrase as you would need to publicly post the SSID and passphrase. Then, unless you have created some DMZ for this musical network, anyone would have access to your network.
But the bigger issue is the act of streaming itself as there is device buffering with such things. It would be near impossible to have the music sync'ed on the devices to any light display.
The best solution would be to broadcast over radio wave on an open channel. Here are some starting points for that:http://www.jpole-antenna.com/2013/10/11/broadcast-high-quality-music-for-your-holiday-lights-display/
https://sourcefmtransmitter.com/shop/category/christmas-lights-to-music/
- Good Luck!