This example is a very simple distributed data system that demonstrates
 the following capabilities:

 - abstraction of DDS from the application logic

 - using a data writer and a data reader connected to
   the same topic but not associated to each other



What the nodes do:

Each node connects a subscriber and publisher for sending an receiving file
 differences.  The node connects the DDS components and then either publishes
 the starter file or waits until it receives the first published file.  The
 node writes the file into the file directory.  The node then waits a random
 amount of time then publishes a "diff" to the published file.  The "diff"
 is just created data.  Each "diff" is written into a file in the file directory.
  The filename specifies that it is a diff and the file it applies to and the
 version numbers.  Each node publishes 3 "diff"s.


How to run this example:

Run the DCPSInfoRepo:
$DDS_ROOT/bin/DCPSInfoRepo -ORBSvcConf simple_tcp.conf -o repo.ior -d domain_ids -ORBEndpoint iiop://:2007

Run the nodes:
node -ORBSvcConf simple_tcp.conf -DCPSInfoRepo corbaloc:iiop:[repo machine]:2007/DCPSInfoRepo -n node_1 -d files_1
node -ORBSvcConf simple_tcp.conf -DCPSInfoRepo corbaloc:iiop:[repo machine]:2007/DCPSInfoRepo -n node_2 -d files_2

Run the node to publish the first file:
node -ORBSvcConf simple_tcp.conf -DCPSInfoRepo corbaloc:iiop:[repo machine]:2007/DCPSInfoRepo -n node_3 -d files_3 -f starter_file