Now, as far as the question, Steve gave you the quick answer.  The longer one is:

All of the information you need to know about setting up DMRLink is in the readme files that come with the code.  However, like us it did take some experimentation to get it right.  That is expected.  However, when we had a question about how something worked or if an error was generated we most often looked at the code to determine what was wrong with our configuration files.  I strongly advise you to look at the code as well.  There is no better and more authoritative answer than the implementation.  Enjoy Python, it is a cool language.

Mike