I did a tcpdump on the wifi data sent by the Sentry Mini, which is made by uAvionix, and it seems to blast out GDL-90 format data on UDP/4000 like other ADS-B receivers.  It looks like it should be possible to add this to the list of receivers that work with Skydemon, and it's a pretty nice, inexpensive device.  When I try to use it in SD as a GDL90 Compatible Device I get "Waiting for Device".