For example, I found in ZCL spec, the cluster id :0x0001 (power configuration), the attr id 0x0021 (BatteryPercentageRemaining) could be reported. But for attr id 0x0020 (BatteryVoltage), the spec does not say whether it can be reported or not. And I also tried to configure reporting, it succeed. So my question is which attribute can be reported?
As I know, all of attributes can be reported. In ZCL specification, it only specifies if the attribute is for read only or for both read and write.