@Nonnull
    public List<Role> getRolesToBroadcastPresence() {
        return Collections.unmodifiableList(rolesToBroadcastPresence);
    }
Returns the list of roles of which presence will be broadcast to the rest of the occupants.
This feature is useful for implementing "invisible" occupants.

@return the list of roles of which presence will be broadcast to the rest of the occupants.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/MUCRoom.java