https://devzone.nordicsemi.com/f/nordic-q-a/73864/the-phone-cannot-connect-to-the-bluetooth-deviceHi, everyone on the community softdevice: sdk17 I added the BLE_APP_UART peripheral function to the scanning project, but the device is wrong when the phone is connected.The program jumps to the BLE_GAP_EVT_PHY_UPDATE_REQUEST condition in the BLE_EVT_HANDLERen-USTelligent Community 13Tue, 13 Apr 2021 09:49:16 GMThttps://devzone.nordicsemi.com/thread/304456?ContentTypeID=1Tue, 13 Apr 2021 09:49:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e7cbaf58-4995-4904-a629-bd4ebab196afHung Bui<p>Hi Yuxu,&nbsp;</p> <p></p> <p>Please try capture a<a href="https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE"> sniffer trace</a>&nbsp;when testing so we know what happens over the air.&nbsp;</p> <p>Could you explain what exactly you meant by &quot;<span>added the BLE_APP_UART peripheral function to the scanning project&quot;&nbsp; ?&nbsp;<br />Could you check if there are several functions that call sd_ble_gap_phy_update() in your code ?&nbsp;</span></p><div style="clear:both;"></div>