Instead of using /bin/xml_server and /bin/msfdrbd you can use the simulator by specifying "databases:simulator" and "xmlrpc-simulator" as shown in config/fidius.yml.example.
By starting bin/xmlserver_simulator you will be able to use candc server completly without metasploit and real target machines.
You may need to setup the database for the simulator:
$ rake db:create ENV=simulator
$ rake db:migrate ENV=simulator
Use $ rake scenario:setup ENV=simulator ID=001
to setup a test scenario.