Creating Cosem Object of CompactArray type

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By Alexandre , 27 February, 2023
Forums
Gurux DLMS for Java

Hello !

I recently created a GXDLMSServer that can generate a read/response PDU frame for a Cosem object from a simple logical name.

To achieve this, i've created Cosem objects from the GXDLMSProfileGeneric class and added to it the CaptureObjects and buffer, so a response frame can be created for the given object.

Now I'm stuck for a few days on the creation of a Cosem object whose type would be a CompactArray of Unsigned32.

Not having found any source allowing me to create this object, could a user explain me the approach and the Java Cosem objects that must be used to create this instance of Cosem object? Thanks in advance to you !

Exemples of tested Java Code :
1.
GXDLMSProfileGeneric importActivePowerLoadProfile = new GXDLMSProfileGeneric("1.1.99.1.0.255", 25568);

importActivePowerLoadProfile.setDescription("ImportActivePowerLoadProfile");
importActivePowerLoadProfile.setAccess(2, AccessMode.READ);
importActivePowerLoadProfile.setAccess(3, AccessMode.READ);
importActivePowerLoadProfile.setAccess(5, AccessMode.READ);
importActivePowerLoadProfile.setMethodAccess(1, MethodAccessMode.ACCESS);
importActivePowerLoadProfile.setSortMethod(SortMethod.LIFO);
importActivePowerLoadProfile.setDataType(2, DataType.COMPACT_ARRAY);

GXDLMSData uint32 = new GXDLMSData();
uint32.setDataType(2, DataType.UINT32);

GXDLMSCompactData compactDataObject = new GXDLMSCompactData();
compactDataObject.setAccess(2, AccessMode.READ);
compactDataObject.getCaptureObjects().add(new AbstractMap.SimpleEntry<>(uint32, new GXDLMSCaptureObject(2, 0)));
compactDataObject.updateTemplateDescription();
compactDataObject.setTemplateId((short) 0);
compactDataObject.setBuffer(new byte[]{0, 0, 0, 0});

importActivePowerLoadProfile.addCaptureObject(compactDataObject, 2, 2);

Object[][] buffer = new Object[1][];
buffer[0] = new Object[]{ new byte[]{0,0,0,0}};
importActivePowerLoadProfile.setBuffer(buffer);
2.
GXDLMSProfileGeneric importActivePowerLoadProfile = new GXDLMSProfileGeneric("1.1.99.1.0.255", 25568);

importActivePowerLoadProfile.setDescription("ImportActivePowerLoadProfile");
importActivePowerLoadProfile.setAccess(2, AccessMode.READ);
importActivePowerLoadProfile.setAccess(3, AccessMode.READ);
importActivePowerLoadProfile.setAccess(5, AccessMode.READ);
importActivePowerLoadProfile.setMethodAccess(1, MethodAccessMode.ACCESS);
importActivePowerLoadProfile.setSortMethod(SortMethod.LIFO);
importActivePowerLoadProfile.setDataType(2, DataType.COMPACT_ARRAY);

Object[][] buffer = new Object[1][];
buffer[0] = new Object[]{ new byte[]{0,0,0,0}};

GXDLMSProfileGeneric compactArray = new GXDLMSProfileGeneric();
compactArray.setDataType(2, DataType.COMPACT_ARRAY);
compactArray.setAccess(2, AccessMode.READ);
compactArray.setBuffer(buffer);

GXDLMSCompactData compactData = new GXDLMSCompactData();
compactData.setBuffer(new byte[]{0, 0, 0, 0});

compactArray.addCaptureObject(compactData, 2, 0);
importActivePowerLoadProfile.addCaptureObject(compactArray, 2, 0);

importActivePowerLoadProfile.setBuffer(buffer);

Response from thoses objects : C4 01 C1 00 01 01 02 01 00 00 00 00 FF C2 7E

And the expected response :
C40144001302010681D000A000B400A0009A00A0011600A000E400A0014400A000F800A0013400A000C800A0012600A0011E00A0013000A001C400A001A600A001B200A001D200A001CE00A0048200A0055E00A0034800A001E600A0035600A007D400A0027800A0022800A0022A00A002EA00A003DC00A0053000A0016E00A001A400A0020200A0017600A0017200A0018A00A0018A00A000EC00A000C000A000D600A000DC00A000BE00A000C000A000D400A000DE00A000C000A000C000A000D000A000E0C020078080202D2400A000E4C020078080202D24

Thanks again !

Hi Kurumi !

Thank you for your previous answer ! I understand better now the use of a CompactData object.

But i'm still not sure what a CompactArray buffer and capture object look like.
If i understood correctly :
The templateDescription of the CompactData object defines the type of the array contents (byte 6 for Uint32)
The buffer must contain an CompactArray of Uint32, which can be obtained by setting the CompactData buffer with : new byte[]{19, 1, 6, 6, 6, 6, 6} (or from a captureObject that contains the buffer and by invoking the capture method)

But i'm still getting the "C401C1010416" error frame...

The new code :
GXDLMSCompactData importActivePowerLoadProfile = new GXDLMSCompactData("1.1.99.1.0.255", 25568);
importActivePowerLoadProfile.setDescription("ImportActivePowerLoadProfile");
importActivePowerLoadProfile.setAccess(2, AccessMode.READ);
importActivePowerLoadProfile.setAccess(3, AccessMode.READ);
importActivePowerLoadProfile.setAccess(5, AccessMode.READ);

importActivePowerLoadProfile.setMethodAccess(1, MethodAccessMode.ACCESS);
importActivePowerLoadProfile.setCaptureMethod(CaptureMethod.INVOKE);

GXDLMSData compactArray = new GXDLMSData();
compactArray.setDataType(2, DataType.ARRAY); // COMPACT_ARRAY throw : java.lang.IllegalArgumentException: Invalid data type.
compactArray.setAccess(2, AccessMode.READ);
// 19 : COMPACT_ARRAY, 1 : 1 element, 6 : UINT32, 6, 6, 6, 6 : UINT32 value
compactArray.setValue(new byte[]{19, 1, 6, 6, 6, 6, 6});

importActivePowerLoadProfile.getCaptureObjects().add(new AbstractMap.SimpleEntry<>(compactArray, new GXDLMSCaptureObject(2, 0)));
importActivePowerLoadProfile.setTemplateDescription(new byte[]{6});

try {
importActivePowerLoadProfile.capture(server);
} catch (Exception e) {
System.out.println(e);
}

Could you please explain me how to properly set a capture object ? It's really the only object i'm having trouble with.

Thanks again for your help !!