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BLE and BTC discoverability

Can the Basic Rate (Bluetooth Classic) interface be non-discoverable while the BLE interface is discoverable?

Both the SPP and SPPLE SetDisc() examples call GAP_Set_Discoverability_Mode(BluetoothStackID, dmGeneralDiscoverableMode, 0).  For BLE I thought discoverability was just a bit in the advertisement, but is there something more that happens in the stack?  Question rephrased - Why does the SPPLE call GAP_Set_Discoverability_Mode(BluetoothStackID, dmGeneralDiscoverableMode, 0)?