For an long-running audio project I like to use BLE -->Teensy Audio board --> BLE. Using I2S.
Any body has done this before and is will to share the code/setup?
I2S to bluetooth has come up many times. Results are mixed. Some chips only support much lower sample rates. Here are several prior threads. I'm sure you can find more with a bit of search work.
My project is still active. Just haven't gotten it working yet while I work on other things. Other users say its possible. The goal is to make a stackable module so you could do what you are asking to do. One for input and one for output.