I am migrate app from Z-stack 3.0.x to Z-stack 3.4.0 but i am not see zclSampleLight_ModelId in samplelight app, so why it is remove and it is not require?
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This attribute is not mandatory for the ZCL_CLUSTER_ID_GEN_BASIC cluster but is still supported by zcl_general so you are able to add it back in if desired as it will not affect ZCL operation.
Regards,
Ryan