I can physically see the service endpoint (i.e. no firewall is blocking me) but I get prompted for a token. I follow the link it presents to get one, but I then get a blank page with just an "API reference" link.
You can either geofence the items in the live feed or import buffered static points as geofences. Both are viable options.
Option 1. If you have static points, you can buffer them in ArcMap, then serve out the buffers as a feature service. You register a "Data Store" (ArcGIS Server, Portal, or ArcGIS Online) in GeoEvent Manager that points to that instance, then you will have access to the buffer layer when setting up any filter or processor that needs to use those buffers as a geofence.
Option 2. You could just serve out the points layer as a feature service. Register the data store the same way, then you will have access to the points layer the same way. The only difference is that you'll need to buffer the geoevents, then use that polygon in your filter or processor to do your spatial operation. They both can get you what you want, just using two different logical approaches.
In case #1 you have geoevent *points* you use with an "INSIDE" operation when comparing to *polygon* geofences (the polygons in the feature service), whereas in case #2, you have geoevent buffer *polygons* you use with a "CONTAINS" operation when comparing to *point* geofences (the points in the feature service). You can do exactly what you want, it's just a matter of piecing it together. I know your question is still unanswered, but I'm trying to lay out general concepts. If you can get me a link to a feed I can see, I can list out the exact steps you need to do.
In the meantime, here is a video from UC that you may want to check out. I haven't watched the whole thing but upon skimming it, I noticed some setting up of inputs, and setting up of some geofencing.
Video Link : 3486
