Power over Ethernet (PoE) basics and beyond

PoE is awesome. My custom home security system is all CCTV PoE with a gstreamer backend running on four-core fanless linux box. Way to go. Complete control. No batteries, no wares spying on me, no personal data getting scraped by big guys. (Cloud connectivity sucks because I have segmented mp4s and jogging through them hurts but I only care for events after they happen, not while they happen.)

Got any recommendations on what cameras to get? The market is absolutely flooded with cheap shitty cloud-connected all-in-one cameras making it hard to find good, simple products.

Any of those that mention ONVIF or RTSP will do if you put them on a LAN without internet access

Aye.

ONVIF is the (now quite old, but still very relevant) standard for interfacing IP cameras locally on a network.

A cheap-but-performant ONVIF camera on an isolated VLAN (or a physically-isolated network; I won't tell anyone) can be a thing of beauty that is also completely unable to call home to some mothership in the clown.

I'm frankly very surprised that I don't see it mentioned here more often when discussions of cameras arise.

https://en.wikipedia.org/wiki/ONVIF

ONVIF has it's own problems, like when a NVR require ONVIF and all you have is rtsp. You need to convert somehow.

Or ONVIF has a multiple cameras behind a IP, but a crappy ONVIF client only picks one (Unifi Protect).