it looks like the helpful instructions provided here http://ladyada.net/products/beaglebone/wifi.html
does not work with connman 0.79 (that is the version currently provided by angstrom repository).
According to this http://connman.net/blogs/patrik/2012/connman-079
, they have made some changes property names,... starting at version 0.79
I have not been able to make wifi to work with connman 0.79