I am also on the quest to find the elusive URL setting that will allow a FI9821W camera to interface with Vera. Last night I tried almost every combination of the string /cgi-bin/CGIProxy.fcgi?cmd=snapPicture to see if my Vera 3 would recognize it. No luck.
I have scoured the SDK and CGI manual for both the FI9820W and the FI9821W manual without finding an answer. I have also spent a great deal of time on the foscam.us forum looking for an answer as well.
I am beginning to wonder if the Video URL needs to play a role in the solution. Trotsky40, were you able to interface an FI9820W with Vera? If you did, what were your video and snapshot URL?
The FI9821 CGI User Guide also refers to /snapPic/***.jpg. I tried using various combinations of /snapPic as part of a URL string without success.
My experience seems to be that if I get an invalid URL I am farther from success than when I see "Camera Not Responding". But it just a feeling, that I have not verified.
The FI9821W seems like it may have potential when used with Vera. One of its best features for me is the fact that its multicamera mode can handle both MJPEG and H.264 cameras. I know of no other desktop camera interface that can do that.
As far as interfacing it with Vera, we may have to be patient until MiCasaVerde is able to help us. But patience is not a strong point of most Vera owners, myself included. So I guess I will keep trying to see if I can find a workaround. Sleep is very overrated.