refs
http://karulis.github.io/pybluez/ http://people.csail.mit.edu/albert/bluez-intro/c212.html https://android.googlesource.com/platform/packages/apps/Bluetooth/+/jb-mr2-release/src/com/android/bluetooth/a2dp/Avrcp.java http://www.robertprice.co.uk/robblog/2007/01/programming_bluetooth_using_python-shtml/ https://github.com/Mqrius/BluePloverPi
/etc/bluetooth/main.conf
# Default device class. Only the major and minor device class bits are
# considered.
#Class = 0x000100
Class = 0x002540
file:///etc/bluetooth/audio.conf
# If we want to disable support for specific services
# Defaults to supporting all implemented services
Disable=Gateway,Source,Socket