Hello,
Can you please explain about the Emoncms that is how its going to retrieve the energy values and provide the graphs using rawdata? And also how can we retrieve energy values for a particular period of time from emon cms?
Thank you
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Emoncms has an HTTP API : Emoncms - site api
This is used to post data into the system and it can be used to retrieve data from the system.
When running Emoncms via our pre built emonSD SD card on an an emonPi / emonBase you can also post data via MQTT.
See logging data locally user guide: 2. Log Locally - Guide | OpenEnergyMonitor
The easiest way to get started if you want to run Emoncms locally on a RasPi is to use the pre built SD card: emonSD pre built SD card Download & Change Log · openenergymonitor/emonpi Wiki · GitHub