Hi,
i report the SV B01 3MP POE as functional.
Gateway (Raspi)
Digest
264 -> Note that the cam is setup to this parameter; my cam was set to 265 at beginning
G711
rtsp://…IP…:554/stream1 -> Echo5 can´t handle 3MP(stream0) set stream1 to VGA resolution
1024x576 -> 16:9 i haven´t try VGA for this setting.
Tags noaudio + proxy I havent tested more or less.

Please check the gateway logs - my gateway hang one time

@chrisb306 check any firewalls and disable to test, see my post as got another hik working now with gateway.
Also ensure substream is set to lowest res.

It used to be that cameras were VGA resolution and that was easier to handle on wireless connections. The RLC-411WS has a resolution of 2560x1440 and a bit rate of about 6144K bps. That’s a lot of data and excellent for reading those auto license plates at distance if you need to zoom a frame. The downside is that on a wireless connection, you will drop frames due to environmental conditions. Consider wiring those cameras. I have three Reolink cameras on my NVR which is a QNAP NAS.