Add Wifi Support, Wifi connection UI, and adhoc

[abcrawford]

Need to develop support to add some wifi networking features into the UI. The Pi-Star image has a similar feature and this is something that's been on the back burner for quite some time. While I still feel that using ethernet is the best and most reliable means of connectivity, there would be some good use cases for Wifi access.

Here are some of the features I would like to see supported in a wifi implementation

• Should be able to scan networks and display a list of SSIDs in web UI to add as connections.
• Should be able to have more than one SSID. i.e. Home, Office, Cell hotspot.
• If wifi is not connected to an available SSID or ethernet is not connected...perhaps after say 2 minutes or so...then it will go into a adhoc WiFi mode and present itself as an access point. The advantages of this would be that 1) it would allow connection to the Web UI to scan for available SSIDs and allow adding as a supported connection, or 2) it will just operate as an adhoc AP so that it can be connected to out in the field and ORP administered.

So of these features since they would require access to the OS, would likely need to be incorporated into the orp_helper script as well to allow the web server the appropriate access it needs.

[Dloranger]

This may be a good place to start as well, seems like the basic OS level stuff has been added, then its just putting the UI wrapper around it

http://www.raspberryconnect.com/network/item/330-raspberry-pi-auto-wifi-hotspot-switch-internet