Some simple examples

The examples directory contains the source to two very simple applets. They are designed to illustrate some of the more important techniques for using the ORE, without too many other distractions. They are not suggested as being useful for anything in their own right! They are both based on ManifestOplet boilerplate code generated by skel.sh.

echo provides a very simple echo service. It provides an API that allows a client to send a string to the standard TCP echo port on a specified host, and then waits for the reply from that host. The data in the reply is returned to the client as the result.

echocli is another oplet that simply provides a command line interface to echo. It does not provide a service of its own.

Features to look out for include:

• how skel.sh has automatically provided much of the boilerplate code for the oplets.
• how both oplets use services provided by other oplets. They declare dependencies on these service in their manifests, and they use the ORE to acquire and relinquish the services.
• how the client oplet creates a command and then registers it with the shell service.