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Please refer to the BLE component(v3.64) datasheet for more information on the list of APIs. Also, in PSoC Creator, if you right click on the BLE component you can find the Datasheet.
Both APIs(CyBle_GappStartAdvertisement & CyBle_GappEnterDiscoveryMode) are used for starting the Advertisement. CyBle_GappStartAdvertisement(uint8 advertisingIntervalType) function is used to start the advertisement using the advertisement data set in the component customizer's GUI with advertisingIntervalType(Fast or slow advertising interval) as input parameter.
CyBle_GappEnterDiscoveryMode(CYBLE_GAPP_DISC_MODE_INFO_T *advInfo) function sets the device into discoverable mode. In the discoverable mode, based on the parameters passed to this function, the BLE Device starts advertisement and can respond to scan requests. Please refer to the BLE component datasheet for more information.