For bug 677143 we want to be able to differentiate "PCI Ethernet" vs "USB Ethernet". I've implemented that in two different ways; the danw/client-bus branch implements it in libnm-glib entirely. The danw/daemon-bus branch implements it in the daemon and then exposes that server-side property in the client. (Though actually, most of the danw/daemon-bus branch is cleanup and code reorg, because I didn't want to have to add a "bus" parameter to every nm_device_*_new() method. Yeah, yeah, so I did 5 times as much work instead.)