/*! \mainpage ASD Tutorial Lesson 2: Ping

This lesson illustrates the steps in bringing up a complete
IPv6 LoWPAN wireless network capability.

It extends the event-driven model associated it boot and timer
events with a sequence of system and networking events.

The only required step is iwconfig_init(), which starts the process
of bringing up the LoWPAN wireless interface.  It enables the 
interface, at which point the link local IPv6 address is assigned
from the EUID64 of the IEEE 802.15.4 link.  

To illustrate the remainder of the process, the iwconfig_handler()
requests notification when a global IPv6 address is assigned.
This address is assigned by DHCPv6, which also provides an IPv4
address for the node.  These addresses are shown in the 
ArchRock LowPAN Router management interface.

Once the IP address is displayed on the LCD, one can ping the node.

\em ping.c - sets up the wireless interface and displays the IP
address to the LCD once the node joins the network.

*/