https://devzone.nordicsemi.com/f/nordic-q-a/42706/nrf52840-softdevice-s140-6-1Hello, I got a problem duringing advertising with the following scenario: I advertise some data to a Scanner. The Scanner answers with a Scan Request. The ble event handler jumps into BLE_GAP_EVT_SCAN_REQ_REPORT within this event, I changeen-USTelligent Community 13Fri, 18 Jan 2019 14:02:04 GMThttps://devzone.nordicsemi.com/thread/166508?ContentTypeID=1Fri, 18 Jan 2019 14:02:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e3f886ef-3a5e-4788-8956-f5a49d2c131fSimonr<p>Hi Stefan</p> <p>It is not possible to change the response data, as 150us is not enough time to signal this to the application. You can look at <a href="https://devzone.nordicsemi.com/f/nordic-q-a/8009/is-ble_gap_evt_scan_req_report-before-or-after-the-adv-broadcast">this</a>&nbsp;case for some more info on the BLE_GAP_EVT_SCAN_REQ_REPORT event. If you wanted to use this as a security measurement, I&#39;d recommend trying a whitelist approach instead where you can manage the devices your scanner allows to communicate with it.</p> <p>The time between an adverrtising event and a scan request is ~160us and between request to response it is ~150us.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/166456?ContentTypeID=1Fri, 18 Jan 2019 12:09:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:45a27f6d-1925-4da0-a91b-5e09ba776180Stefan B<p>Hello, I want to clarify:</p> <ol> <li>The bluetooth spec foresees an inter frame space T_IFS of 150&micro;s before the scan response packet must be sent. </li> <li>Thus, it should be enought time to make some changes in the response data field ?!</li> </ol> <p></p> <p>Best regards</p> <p>Stefan</p> <p></p> <p></p><div style="clear:both;"></div>