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You Only Meter Once - The open hardware smart metering system
...The gathered data is timestamped and transmitted to the coordination device. This device offers interfaces to control the smart meters. On top of the software runs a apachewebserver that provides all estimated data on our yomo project homepage.
The system does not need any maintenance and works out of the box after the devices were integrated into the households Wi-Fi network.
Link to the scientific paper:
http://link.springer.com/article/10.1007%2Fs00450-014-0290-8#/page-1