When i read u48CurrentSummationDelivered attribute of Simple Metering Cluster, the return value is zero.

When i read u8MeterStatus attribute of Simple Metering Cluster, the return value is right.

So I think the problem is that I can't read attributes that are larger than 4 bytes in size.
Is there any way to solve this problem?
There is my code:
Base on project “JN-AN-1218-Zigbee-3-0-Light-Bulb”
Init variables
