Setup a FOSCAM WiFi camera directly connected to a Mac via Ethernet

I have two FOSCAM WiFi IP cameras set up in my house (in addition to an outdoor Arlo I use for security purposes), and generally all three of these cameras give a reliable connection and work without much intervention.

Recently, however, one of the FOSCAM cameras decided to stop connecting to the wireless network. I needed to get access to the camera via the wired interface, but I didn't want to have to bring the camera all the way to where my wired networking drops were located, because it's in a bit of an inconvenient area of the basement in the midst of some cleanup we're doing.

So I plugged the FOSCAM directly into my Mac's USB 3.0 ethernet adapter, and got blinky lights... but couldn't connect to the camera because it's wired connection is configured to use DHCP by default, and there's no Bonjour/zeroconf configuration.

To get around this and directly connect to the camera, I did the following:

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