Sending of scan request by Central depends on the scan type set for the scan settings. If scan type is 'Active', then Central will send a scan request. Else if the scan type is 'Passive' ,then Central won't send a scan request.
You can set it either in the BLE component configuration (as in the attached screen shot) or in the firmware as below:
Before start discovery (scanning), change the scan tpe as active.
cyBle_discoveryInfo.scanType = CYBLE_GAPC_ACTIVE_SCANNING;
ScanningTyp_0.png 34.9 K