Thanks @snell !
Just added it, put it i trace mode and got this:
dev:3862021-07-13 18:11:06.608 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:10:58.551 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:10:50.485 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:10:42.420 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:10:34.355 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:10:26.295 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:10:18.233 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:10:10.169 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:10:02.105 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:09:54.094 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:09:46.042 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
dev:3862021-07-13 18:09:37.937 debugSovrumstemp - Unhandled cluster. 0400 is Luminance measurement, descMap = [raw:9C5D0104000A0000210000, dni:9C5D, endpoint:01, cluster:0400, size:0A, attrId:0000, encoding:21, command:0A, value:0000, clusterInt:1024, attrInt:0]
Please let me know if anything else is needed!