class TelnetFactory(ClientFactory):
      def buildProtocol(self, addr):
          return TelnetTransport(TelnetPrinter)

  reactor.connectTCP(host, port, TelnetFactory())

For something line oriented, you might mix in LineReceiver (as
StatefulTelnetProtocol does) or instantiate one directly yourself in a
TelnetProtocol subclass and feed it bytes in your dataReceived
implementation.

Hope this helps,

Oh, perfect. That was very useful, thanks. I had a feeling the problem was in plugging the objects together properly in buildProtocol, but just couldn't see quite how to do it right.

Merci!

--S