Which are the essential parameters for MeterValuesSampledData?

The following parameters are essential for effective DLM with DC chargers:

• Energy.Active.Import.Register (total imported energy)
• Power.Active.Import (real-time active power draw)
• State of Charge (SoC) 

The following parameters are essential for effective DLM with AC chargers:

• Energy.Active.Import.Register (total imported energy)
• Current.Import.L1 (real-time current draw)
• Current.Import.L2
• Current.Import.L3
• Power.Active.Import (real-time active power draw)

Without access to this full dataset, it is not possible to confirm whether the charger has responded to commands from the EMS, nor to understand the current behavior of the charger. Therefore, the charger must internally update all of these values every second and expose them to the EMS.