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Just for info.
This site have aparently some open source someware to read out the P1 port on a smart meter.
I am not a fan of a smartmeter nor do i own one so i can't say what this info is worth. However i didn't want to hold this info back.
https://sites.google.com/site/nta8130p1smartmeter/home

Thanks for the info, I think we'll see a lot of these initiatives in the future
Some alternatives I found :
https://github.com/willem4ever/Arduino-P1
https://github.com/rhekkers/P1_Publisher
Personally I prefer a networked solution instead of USB, cause most of the times the smart meter is not near a PC.
You can run the software you mention on a Raspberry Pi though, that sounds much better to me