Main idea is to prefix data with 16bit characteristics id so it could be detected inside manufacturer data. Or is there better way to put it there somehow directly (out of manufacturer data)?
EDIT: or not exactly for this idea since is is service ID not characteristics ID but these IDs are in same 16-bit UUID Numbers Document and are unique with each other so including current time simply as 0x2A2B: [ 10 byte array ] in NRF.setAdvertising would make sense?
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Answering myself, there is a way, there is 0x16 Advertising Data Type named "Service Data" and it is precisely for this idea https://devzone.nordicsemi.com/f/nordic-q-a/4048/what-service-data-can-be-added-to-the-advertising-package
EDIT: or not exactly for this idea since is is service ID not characteristics ID but these IDs are in same 16-bit UUID Numbers Document and are unique with each other so including current time simply as
0x2A2B: [ 10 byte array ]
in NRF.setAdvertising would make sense?