I'm building an open source mp3 player that works with selfhosted software

I'm working on an open source mp3 player built on affordable hardware. $50 - built on the m5 Core2 has bluetooth, 3.5mm, and a built in speaker supports SD cards up to 2TB 500mAh battery, upgradeable to 2000mAh plays mp3 and flac files has BPM detection The project is currently a work in progress. The software is open source and available on github This is being built to work with mStream , a selfhosted music streaming server. mStream will be used to manage firmware upgrades and manage files on the SD card