Yes, you can view recorded footage from the NVR via ISAPI for a certain time period. With some testing and effort probably a picture too provided the image was part of a triggered event. Going the ISAPI route might be reinventing the wheel in a sense when you have the ability via the webGUI or...
Try the following:
Disconnect the Ethernet connector at the pigtail. Check for moisture/debris and make sure you hear a click when reconnecting it.
If you are using a PoE injector, disconnect the Ethernet cable and make sure it's seated correctly when you reconnect it.
Check if the problem is...
I don't see a reference to the Test feature in the documentation. Might be a patrol, pattern or preset that is scheduled. Are you able to access the webGUI of the camera?
This works for me using Talend API tester (similar to POSTMAN) in Chrome:
Method POST
http://admin:yourPassword@192.168.1.xx/ISAPI/Traffic/channels/1/vehicleDetect/plates
Body:
<AfterTime>
<picTime>2020-03-07T21:00:00Z</picTime>
</AfterTime>
Result:
We have a confirmed case in South Africa. Won't be long before it's in my neck of the woods. Cape Town has one major public hospital and less than a handful of smaller, ill-equipped hospitals servicing more than 4.5 million people. When Black Friday became a 'thing' in South Africa around 2016...
Via Talend/curl/Postman,
Amend the following to your admin credentials and camera IP.
To switch off IR feature entirely:
PUT
http://admin:yourPassword@192.168.1.xx/ISAPI/System/Hardware
Body:
<IrLightSwitch>
<mode>close</mode>
</IrLightSwitch>
To switch on IR:
PUT...
As you mentioned, do you really need this struggle?
WiFi cameras come with baggage, spare yourself the support headaches and run Ethernet cables. We had a similar situation were the client refused external runs and the crawl space in the roof was 3 feet at the highest point then tapered toward...
To narrow down the issue - What firmware are they on? Are the notifications via email, Hikconnect app or third-party software? Which browser are you using to configure the settings?
Those bright orbs are usually bugs attracted to the IR lights. Camera models? A post of the detection area and motion settings from the webGUI would help too.