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Once the query comes from UI/SNMP/TR69, the PA accesses corresponding D-BUS API. Later the object is identified from the registry and the corresponding API call specific to the parameter being queried is accessed. API to be accessed is determined by the data-model XML which is used for the library. Then the parameter retrieval process end up in retrieving the value for the parameter either from a centralized database maintained by Persistent Storage Manager (PSM) or from a Wi-Fi HAL.

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Figure 4: Code flow of Wi-Fi subsystem

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