USBD BLE UART CENTRAL -example

Question

Hello, 
 Now I am trying to merge usbd_ble_uart and ble_uart_c, I have found some example here.I am using nRF52840 DK , nRF52840 dongle and SDK 17.1.0. 
 I tried https://devzone.nordicsemi.com/f/nordic-q-a/88469/usbd-ble-uart-central-com-port-not-visible which is modifed from https://devzone.nordicsemi.com/f/nordic-q-a/50867/i-can-t-get-usbd-messages-with-a-softdevice-140-on-my-nrf52840-dongle/203656#203656 
 I burned it to DK,the led light normally. But there is no log shows on putty. 
 I want to know how to solve the problem,thank you.

user15146 · Accepted Answer

But there is no log shows on putty. 
 The UART is used for printing the data you receive over BLE. 
 For logging in this example, use RTT logging backend instead. You can use e.g. Segger RTT viewer.

USBD BLE UART CENTRAL -example

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