https://devzone.nordicsemi.com/f/nordic-q-a/85825/use-fixed-ble-mac-address-on-advertisementI&#39;m trying to send data readings an advertising packets from the nrf21540-dk board, and use the phone as an observer to record the data. So far I&#39;ve been able to send counters, and other data over BLE as advertisements. The issue I&#39;m having is thaten-USTelligent Community 13Tue, 15 Mar 2022 15:05:09 GMThttps://devzone.nordicsemi.com/thread/358267?ContentTypeID=1Tue, 15 Mar 2022 15:05:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7b7568b0-d7a7-4d57-b1d7-9fa1e0639266Taylor<p>I was trying to get the device to advertise without changing it&#39;s address each time I did a stop and start. What I found is that I overlooked the first parameter for bt_le_adv_start, which after changing it to BT_LE_ADV_NCONN_IDENTITY, the address no longer changes and it works.</p> <p></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/358228?ContentTypeID=1Tue, 15 Mar 2022 13:33:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9299102e-06a1-42e1-9bff-b601e0a5b055Simonr<p>Hi</p> <p>Typically you can use the<a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fficr.html&amp;cp=4_2_0_12_0_13&amp;anchor=register.DEVICEADDR-0"> DEVICEADDR[0..1] </a>in FICR for this. It&#39;s not possible to change this address, but it is randomly generated in production with the sole intent to be used as a random static address in BLE.</p> <p>In the<a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/reference/bluetooth/gap.html"> Zephyr GAP </a>you can use the bt_addr_le_create_static to create a random static address as well if you&#39;d like, or just set the address used by the Bluetooth controller to use the one from FICR.</p> <p>Best regards,</p> <p>SImon</p><div style="clear:both;"></div>