How to call ElectricalEnergyMeasurementCluster::GetCumulativeEnergyImported? (CON-1950)

[olavt]

I used to have this code working:

// Get the previous measurement
MeasurementData* previousMeasurement = ElectricalEnergyMeasurement::MeasurementDataForEndpoint(GetEndpointId());

then I used it to get the timestamps for the last measurement:

energyImported.startTimestamp.ClearValue();
energyImported.startSystime.ClearValue();
if (previousMeasurement->cumulativeImported.HasValue())
{
    energyImported.startTimestamp = previousMeasurement->cumulativeImported.Value().endTimestamp;
    energyImported.startSystime   = previousMeasurement->cumulativeImported.Value().endSystime;
}

The problem is that ElectricalEnergyMeasurement::MeasurementDataForEndpoint doesn't seem to exist anymore.

But, I found this function (in app/clusters/electrical-energy-measurement-server/ElectricalEnergyMeasurementCluster.cpp):

CHIP_ERROR ElectricalEnergyMeasurementCluster::GetCumulativeEnergyImported(Optional<EnergyMeasurementStruct> & outValue) const

But, I don't fully understand how to call it from code like the all-device-types-app electrical-measurement.cpp.

How would such code look like?