Hi just saw this and thought this would be great feature for the mydooropener app. I ride bikes and motorcycles and saw this feature on someones custom script that opens on wifi connect. Would be good to have this feature built into the mydooropener app so you can just drive up and not have to pull your phone out or stop the bike etc. You would have to have some way of verifying that you are connected on your local wifi and not just any wifi. One idea (maybe there is better way) is to have the app ping the local lan IP of the raspberry pi/Arduino upon wifi connect. If reply is recieved it would then toggle/open the door. I think that would be enough to determine that it is indeed on the local wifi network. So settings would be just an feild for local IP, and check box to enable/disable the feature as I'm sure there are times you would not want to have it enabled. Maybe make it possible to pin on non standard port to help eleminate false positives.
http://www.youtube.com/watch?v=97oZNOBbrfQ&feature=youtu.be
App is amazing... haven't even gotten it into my garage yet but just from testing it on top of my desk it works great. I have implemented it with the raspberry pi.