The phone cannot connect to the Bluetooth device

[yuxu]

Hi,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_HANDLER function, and the SD_BLE_GAP_PHY_UPDATE function returns NRF_ERROR_BUSY.

How to solve this problem?

[Hung Bui]

Hi Yuxu, 

Please try capture a sniffer trace when testing so we know what happens over the air. 

Could you explain what exactly you meant by "added the BLE_APP_UART peripheral function to the scanning project"  ? 
Could you check if there are several functions that call sd_ble_gap_phy_update() in your code ?