The USP protocol agent (UspPa) is normally disabled in RDK-B.

To enable it, add the following line to your target device bit bake layer:

DISTRO_FEATURES_append = " usppa"

UspPa is currently enabled in the RaspberryPI build of RDK-B.

To disable it, comment out, or remove the above line from meta-cmf-raspberrypi/conf/distro/include/rdk-rpi.inc.