https://devzone.nordicsemi.com/f/nordic-q-a/126867/i-am-facing-an-issue-in-nrf-connect-sdk-v2-9-0-related-to-pairing-and-bonding-callbacksMy device supports both Central and Peripheral roles. By default, it works in Peripheral mode. When the device connects in Peripheral mode, I want the following behavior: A passkey popup window should appear on the mobile app. The mobile shoulden-USTelligent Community 13Wed, 11 Feb 2026 06:33:53 GMThttps://devzone.nordicsemi.com/thread/560864?ContentTypeID=1Wed, 11 Feb 2026 06:33:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5200464d-95c8-4621-97e1-2c6d26c6fb8dSagar Bhosle<p>thanks Simon&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/560455?ContentTypeID=1Thu, 05 Feb 2026 14:15:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:85bddede-ccd8-4ee2-92a7-390af1aee066Simonr<p>Hi</p> <p>You should be able to&nbsp;<span>change&nbsp;</span><code dir="ltr">bt_conn_auth_cb</code><span>&nbsp;at runtime globally via&nbsp;</span><code dir="ltr">bt_conn_auth_cb_register()</code><span>&nbsp;(re‑registering or unregistering). Passing NULL here should unregister previous callback structures.</span></p> <p><span>Alternatively, once per‑connection via&nbsp;</span><code dir="ltr">bt_conn_auth_cb_overlay()</code><span>, with the SMP timing and “only once per connection” restrictions meaning it c</span>annot be used if SMP security procedures have already started on that connection.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>