To apply the patch I submit, you need to check out the Stage code base from SVN, so:
svn co -r 8286https://playerstage.svn.sourceforge.net/svnroot/playerstage/code/stage/trunk
Go to the following URL:http://sourceforge.net/tracker/?func=detail&aid=2878504&group_id=42445&atid=433166
Expand the "attached files" and download the files.
Put the file "wander_wifi.cc" into the stage/examples/ctrl/ directory.
Put the file "communication.cc" into the stage/libstage/ directory.
Put the file "wifi_comm.patch" into the stage/ directory
Go into the root of the stage distribution (ie stage/), and run the following command to apply the patch:
patch -p0 -i wifi_comm.patch
Follow the normal stage compile directions, to get everything built.
To see a demonstration of the wifi working, run stage and use the world file worlds/wifi.world.
To see how the communication interface works, look at the wander_wifi.cc file mentioned above.
Hope that helps!