after a longer time, I've finished my software works and implemented a complete wMBUS Stack (Wireless Meter Bus). The software runs very stable on RPI and the piggy-back board (now in a black case).
On the piggy board, there is a radio module (RFM22B), which can send and receive packets from all smart meters, which are following the standardized wMBUS protocol (EN 13757).
This is the link to cosm, which visualizes all of the sensor data: https://cosm.com/feeds/76490
Every smartmeter which is meassuring usage data (e.g. usage of gas, water, power) or every meter which is sending temperature data, humidity, air preassure, brightness values or even movements in a room can be detected and processed by this software.
The software is also able to create additional virtual meter data, which is derived from physical meter data. E.g. the Power usage, meassured in Watt hours (Wh), is used to create an additional virtual meter 'Cost', which predicts the expected costs for power per year at e.g. 23Cent/kWh pricelevel, based on the current power usage.
Just for visualizing these sensor data, there is also a communcation implemented to cosm, using their API. cosm is a clound service for visualizing sensor data. @ https://cosm.com/feeds/76490
you can see the result of our two energymeters. The MBS-112 is meassuring power related values of our IT infrastructure and the second one, the MBS-121 is meassuring the temperature, air preassure, humidity and is detecting movements in our office.
The movement sensor detects movement in a room and set a value to '1'. cosm is able to fire an action routine, if a meter crosses a certain value. If the movement counter is higher or equal to 1, cosm creates a twitter-message or can send an email. This is a nice feature which can be used for detection of movements in an office out of business hours.