I've successfully set up Homebridge to run both of the IP cameras that Sighthound is also running. The main reason I wanted to do this was the ability to get a (native) rich notification for motion events through iOS which includes an image snapshot.
To get the snapshot working, I had to emulate a motion sensor trigger in the same "room" as the cameras are assigned in HomeKit.
To do THAT, I am having Sighthound run a command when a rule is triggered for either of the cameras, which runs a shell script and ultimately triggers the homebridge motion sensors for a few seconds, sending me the notification. If anyone is interested, I'm happy to elaborate on the process I'm using.
The only flaw in all of this is that the snapshot Homekit takes from the camera to feed me in a notification is delayed by several seconds from the time the rule was triggered. So, while the email Sighthound sends me showing an image of the triggered rule is perfect, the HomeKit snapshot has been consistently missing what I'd like to see in the image.
Has anyone else experienced this dilemma, or have ideas of "speeding up" this process? At this point I'm not positive where the greatest lag is but will do some testing to find out.