How would a client/server utilizing UPnP work in Ruby?

I'd like to allow two computers behind routers share files in a server/client setup using Ruby; I've looked into the UPnP implementation for Ruby, but the documentation is, in my opinion, fairly poor and it does not offer much of an explanation of the library. Can someone give a basic e开发者_JAVA百科xample of how a server and client, both behind routers, would work utilizing UPnP with, preferably, DRB?

Thanks!