Hi
I think you can also send the data from the protocol via serial port that would avoid the usage of a shield or module. There are some libraries for that I think this one does http://www.rscada.se/libmbus/ also I believe there are some for python that might help, but I’m not sure I’ll try to do more research and some testing on this If I’m able to find something more concrete I’ll let you know.
Regards
JPMontero_Intel