https://devzone.nordicsemi.com/f/nordic-q-a/41006/nrf52-how-to-connect-to-paired-devicesHello Nordic Experts, I am developing the pairing in a central. I am working on nRF52840 DK with nRF5_SDK_15.2.0_9412b96 as the cnetral and I have an iOS app as the peripheral. When I press a button, I start scanning and looking for a particular UUIDen-USTelligent Community 13Tue, 11 Dec 2018 23:11:51 GMThttps://devzone.nordicsemi.com/thread/161310?ContentTypeID=1Tue, 11 Dec 2018 23:11:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c7035047-a6db-458c-b5c2-a635457ab55aHSh<p>Thanks Einar, I followed you suggestions and it worked.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/159682?ContentTypeID=1Fri, 30 Nov 2018 11:29:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e64ea6ec-8add-4fe5-88d2-d260c6b2e970Einar Thorsrud<p>Hi,</p> <p>The iPhone use privacy, where it derives the MAC address form the Identity Resolving Key (IRK) and changes it regularly. The IRK is exchanged during bonding so that the nRF can see that the iPhone is the same device even though it&#39;s MAC address changes. To connect to the specific peripheral, you can use whitelisting with the IRK. When using whitelisting in central mode you configure the white list and start scanning. In this case, the SoftDevice will only connect to the whitelisted device(s).&nbsp;You can refer to the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/ble_sdk_app_hrc.html?cp=4_0_0_4_1_0_1">BLE Heart Rate Collector Example</a>&nbsp;to see how it can be done.</p><div style="clear:both;"></div>