toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (endTime != null) 'endTime': endTime!,
if (finalMeasurement != null) 'finalMeasurement': finalMeasurement!,
if (id != null) 'id': id!,
if (startTime != null) 'startTime': startTime!,
if (state != null) 'state': state!,
};