I have some macOS screenshots of an USBNet setup posted *somewhere*, it'll eventually come back to me

.
EDIT:
Here. Except that's a legacy *main* setup, so you'll have to follow @Galunid's advice as far as IP addresses are concerned. That's also documented in the RP or CRP README, IIRC.
Because, yeah, unless you specifically ask for something, it's going to be charge only over USB in diags mode

.
(And even then, "charge" might be pushing it, it has a tendency to actually
discharge

).