I do not use nor know Meteobridge and how it interfaces with Cumulus so may be totally off base. In my experience the Cumulus 32701 error is most always when something else is already connected and using the Davis logger. As best as I know you can run only 1 program at a time with the Davis logger unless you have something like VVP (VVP is no longer supported). I am again using VVP with Weatherlink and Cumulus (in TCP/IP setting), but occasionally there is a can't connect conflict that causes Weatherlink and/or Cumulus to stop receiving from the logger. A stop and restart of VVP, Weatherlink and Cumulus usually then works fine again.
Enjoy,
Paul