Hi Betz!
I'm also facing the same issue! I have found out the following:
https://www.tinaja.com/glib/muse145.pdf
Here you can find a explanation of the Communication protocol and an example including schematic and Assembler Code for a PIC 16F84
I have found the official specification on page 37 of the following link:
**broken link removed**
I have just begun doing some investigation. What are your plan's?