I'm running Indigo 6.0.0 b11 on an iMac, OS X 10.8.4, with a Time Capsule 4th gen, Smartphone Radar v1.0.0 (which is the one available at Indigo library).
I downloaded and installed the Smartphone Radar plugin and manage to configure the syslog to redirect router logs to the plugin.
I obtain the following logs when one of the phones connects:
05/08/2013 13:00:20
Smartphone Radar Watching for smartphone 'Mac iPhone' at address '30:f7:c5:72:77:74'.
Smartphone Radar Watching for smartphone 'Mac iPhone' at address '30:f7:c5:72:77:74'.
Smartphone Radar Router Log: <133>Aug 5 13:00:33 time-capsule 80211: Associated with station 30:f7:c5:72:77:74
Smartphone Radar Watching for smartphone 'Mac iPhone' at address '30:f7:c5:72:77:74'.
Smartphone Radar Watching for smartphone 'Mac iPhone' at address '30:f7:c5:72:77:74'.
Smartphone Radar Router Log: <133>Aug 5 13:00:33 time-capsule 80211: Installed unicast CCMP key for supplicant 30:f7:c5:72:77:74
And something like this when disconnected:
Smartphone Radar Router Log: <133>Aug 5 13:03:07 time-capsule 80211: Disassociated with station 30:f7:c5:72:77:74
Smartphone Radar Watching for smartphone 'Mac iPhone' at address '30:f7:c5:72:77:74'.
Smartphone Radar Watching for smartphone 'Mac iPhone' at address '30:f7:c5:72:77:74'.
Smartphone Radar Router Log: <133>Aug 5 13:03:08 time-capsule 80211: Rotated CCMP group key.
Also as per Travis advice, I activated the SNMP on the Time Capsule, even over WAN (used Airport Utility 5.6 for that).
Things is also that the configuration windows I get from the plugin looks like this:

(https://www.dropbox.com/s/c1e4l2n6xlj5s9h/Config.png)
which is NOT the window depicted on the Installation thread, so I cannot select the router type or activate/use the SNMP from the plugin.
Any help will be appreciated.
Alejandro