this is one of my old project. Yes I know we can buy chromecast, bluetooth... but why to spend money if we have at home some old smartphone and hi-fi without internet connection. At home on your wifi, you can also stream music from your PC, NAS...
This works also in the middle of nowhere, without real wifi. You can use tethering between two phones without spend your mobile internet data.
What I needed;
- 2 phones
- BubbleUPnP app