Broadcasting not working on xena

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From experiments/interfaces

$ cd experiments/interfaces
$ make gumstix
$ scp gs.out root@<xena's ip>:/home/root/gs.out
$ ssh root@<xena's ip>
$ ./gs.out

root@xena:~$ ./gs.out 

It is my belief that this demo is running on a gumstix.

Setting acceptor IP to: 10.81.3.129
Status = 0

***** SERVICE HANDLER ************************
   Service type:       Data Aggregator.
   Endpoint handle:    3.
   Broadcast handle:   -1.
   Connection handle:  Unset.
   IP:                 10.81.3.129.
   Port number:        10005.
   Interface:          wlan0.
**********************************************


***** SERVICE HANDLER ************************
   Service type:       Data Aggregator.
   Endpoint handle:    3.
   Broadcast handle:   4.
   Connection handle:  Unset.
   IP:                 10.81.3.129.
   Port number:        10005.
   Interface:          wlan0.
**********************************************


When I run this program on the mac, I can use tcpdump to see the broadcasted 
packets.

When I run this program on xena the gumstix, tcpdump sees no broadcasted 
packets.

My suspicion is that mkaddr() is not portable.  I need to print the resulting 
addresses to confirm this problem.  I also may need to figure out a better way 
to construct the broadcast address.

Original issue reported on code.google.com by tanya.crenshaw on 22 Jul 2013 at 10:08