Using Mac Hotspot for automated testing of mobile devices

I've used Apple's Network Link Conditioner to simulate a degraded network for my iOS device testing. But I'd like to set up some automated testing where a Mac's wifi hotspot is used as the mobile device-under-test's wifi connection. I'd like to be able to programmatically disable/enable the wifi network as well as disable/enable the networks upstream connection, perhaps under shell control. Any notion on how to achieve this?