Added live #VSCP #MQTT power demo

Added a live power demo to the existing demo pages. This demo show the actual power usage in our house/office. Data is collected from a smart power meter with an open interface that is installed by our utility company Ellevio.

You can read more about the interfacing of this meter here. On this page you can also find a link to a Python script that does the job if you prefer using it instead of the VSCP driver approach.

Measurements are collected by a VSCP daemon driver vscpl2drv-energy-p1 and sent by the VSCP daemon to the MQTT broker on the vscp demo server. The VSCP daemon collecting data is installed on a Raspberry Pi 3B+ running Raspbian.

More demo data is on the way.

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