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How custom attributes are mapped to handles

Hi,

I am doing a communication with the custom tags which uses the custom characteristic and handle to communicate.

ServiceUuid: 81469e83-ef6f-42af-b1c6-f339dbdce2ea CharacteristicUuid: 8146c203-ef6f-42af-b1c6-f339dbdce2ea noitfyCharacteristicUuid: "8146c201-ef6f-42af-b1c6-f339dbdce2ea",

How these custom characteristics are getting mapped to the handles at BLE module side? is there any scheme how these will get mapped?

Vishal N