how can i use diagnosticArray data which i subscribe them from /diagnostics topic?

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hello everyone, i was wondering if you help me in this case.

i have some modules which send diagnostic array messages over /diagnostic topic. now i wanna used those message but i cant access to them. as we know diagnostic array consist of these values:

byte level # level of operation enumerated above string name # a description of the test/component reporting string message # a description of the status string hardware_id # a hardware unique string KeyValue[] values # an array of values associated with the status

i wanna get as an example name of the module.