Over the last week I have been experimenting with the BK8000L bluetooth modules, and if they could be integrated into Borealis. The upshot is a slightly better price, and includes battery and audio support (I wanted to add audio and battery functions into Borealis once we hit crowdfunding as stretch goals). The issue is however, until then / if we don’t hit the stretch goal, the bluetooth chip will still tell the connected device that it’s audio-ready, which means if the user takes a call or plays media, they won’t hear anything.
Until I need to build in the functionality for this, I will continue to use the SPP-C/HC-05 Bluetooth modules in my designs. Which, might I add, work flawlessly. I even built in a debug/test mode!