callback when sending scan request PDU to a peripheral.

[Vishnu]

Hi Team,

      We have developed an application where we are able to receive scan request notification in peripheral and scan response notification in central.

Is it possible to set/receive callback in central when sending scan request PDU(prior to scan response callback) during active scanning.

I am using softdevice s140_nrf52_6.1.0_softdevice.

Thanks in advance,

Vishnu.

[Hung Bui]

Hi Vishnu, 

On the peripheral side you will receive BLE_GAP_EVT_SCAN_REQ_REPORT event when there is a scan request. 

On the central side you receive BLE_GAP_EVT_ADV_REPORT when you receive an advertising packet, and when you receive a scan response packet. 
So you don't receive an event when you sent scan request but you do receive an event when the advertiser reply with a scan response packet. To be able to detect if the data is from an advertising packet or scan response packet you need to check the "type" value inside ble_gap_evt_adv_report_t struct when you receive the event. 

[Vishnu]

Thanks for your reply Hung Bui.

Buy any chance can we abort sending scan request PDU from central for particular peripheral devices?

in other words.. can we restrict scan request PDUs before sending from central(when active scanning) ..so that peripheral device may not receive BLE_GAP_EVT_SCAN_REQ_REPORT event?

[Hung Bui]

I don't think it's possible. But you can do the opposite. You can do passive only scanning (no scan request) and when you find a device that you want to do scan request,  you switch to ative scanning with the address filter for the advertiser(s). 

[Vishnu]

ok Thanks! will try!