This functions as a basic example, of how to create a remote binary challenge for OCTP. For a basic tutorial of how Docker challenges work, take a look at the Hello World intro challenge at https://github.com/deviosec/chal-web.helloworld.
This challenge uses inetd combined with a simple Nginx server.
The important aspects of this challenge, is in src/init.sh, src/etc/inetd.conf and src/etc/services.
It should be fairly self explanatory, but please file a issue for any questions.