Originally Posted by mstone
Hey Dick, thanks for your research. Your results exactly match mine.
One thing I did discover which somewhat relates to addabox remarks is that if you decide to dedicate the items in the kit you can get a permeant setup by switching to static ip on the router and the aTV. Just hard code a non routable ip and make your own intranet. Since it is so easy to set the iPad to not join other networks the flaky behavior of other wifi can be completely eliminated.
I still think a mifi of some other mobile hotspot is a better solution since you would also have the Internet available. All of this discussion is based on the assumption that Apple will expand airplay to be a universal screen sharing feature because right now it is limited to movies and music.
My personal preference is to have complete self contained presentation system and not have to ask anyone for a password to join their wifi network.
1) I set up my AirPort Express with a manual IP address: 126.96.36.199
2) I designated it as the router with the same IP Address: 188.8.131.52
3) I set the AppleTV to use the Airport Express.
4) I set the iPad to use the Airport express -- In order to reliably select the Airport Express I had to forget both networks on my Airport Extreme Dual. I think the reason is that these 2 have a more powerful signal and the iPad goes for signal strength.
5) Once forgotten, I had no trouble selecting the Airport Express. The "forgotten" networks still remain defined -- they just aren't scanned for a signal.
6) Streaming from the video app and the photos app worked as expected.
7) I unplugged and replugged the AppleTV and the Airport Express
8) when the AppleTV and Airport Express became active the re-recognized the Airport Express -- though I think is there is too long a delay waiting for the Airport Express, the AppleTV will just act as if no network is available. Then, you must reselect the Airport Express,
9) It doesn't look like the iPad automatically re-recognizes the Airport Express -- you have to re-select it..
10) But it works, and is reasonably straight-forward to set up -- If you have access to an HDMI port on the HDTV * and a couple of wall outlets, you should be able to setup in 5 minutes or less.
* Some HDTVs have a handy HDMI port on the side of the TV making this a no-brainer.