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Is it possible to set up Android in ad-hoc peer-to-peer wifi mode? For example, I would like to have one phone broadcast a message, and have all peers in the network receive the broadcast, without having a server. I would like to use wifi since bluetooth range is more limited.
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Android phones and Android tablets cannot connect to Ad Hoc networks, by default.
Android P2P is now called WiFi Direct. On the Settings panel select Wi-Fi. You'll see a list of WiFi networks but you want to click the menu button on the lower right (the vertical ...). This opens up a submenu with Wi-Fi Direct as one of the options, select it.
A peer-to-peer (p2p) overlay network consists of a dynamically changing set of nodes connected via the Internet (i.e., IP). A mobile ad hoc network (MANET) consists of mobile nodes communicating with each other using multi-hop wireless links.
HotSpot requires a Wi-Fi connection and works like your Wi-Fi Network at home. The HotSpot will normally only allow you to use the Internet. Not interact with other computers or gadgets using the same HotSpot. The Ad-Hoc is a wireless network without the need of a big Server, or a Router.
Here's a bug report on the feature you're requesting.
It's status is "reviewed" but I don't believe it's been implemented yet.
http://code.google.com/p/android/issues/detail?id=82
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Although Android can't find and connect to ad-hoc networks it sure can connect to Access Points. So as a work-around you can turn your Wireless Card into an Access Point using, for example, Connectify.
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