how to start a "hello world' and connect the board to my mobilephone

[Cong Ma]

I turn on the device, the led turns green. And I use usb to connect it with computer then I  open the nrf connect for desktop, the bluetooth low energy tool,

10:51:05.822

Received status with code 0 PKT_SEND_MAX_RETRIES_REACHED, message: 'No response from device. Tried to send packet 6 times.'

10:51:07.010

serial port COM3 closed.

10:51:07.015

Error occured when opening port. Errorcode: NRF_ERROR_TIMEOUT (0xd)

then this error happened, and I cant find the device on my phone.

How can I start a hello world with my phone?

[Vidar Berg]

Thanks. So the project is being built with a bootloader. Did you add or change any configurations? The bootloader should not be included if you just build the example as is.

[Cong Ma]

I set the prj_cdc.conj configuration because I use usb to Link the board to the computer. And set the Kcongfig.fragments like this. For code I didnt change anything.

[Cong Ma]

Hello. I flash the hci_usb to the nrf5340. Now LEDs 1, 2 and 3, light up, but I still can't find the device on my phone as well as on my computer. And I running the peripheral_UARt is still the same problem as yesterday.

[Vidar Berg]

Please program the peripheral_uart example using the default prj.conf and no additional kconfig fragments.

And hci_uart is not a complete standalone Bluetooth application like peripheral_uart is. Please see the sample description for more details.

[Cong Ma]

Thank you. I have tried your way and successed! Now I have linked the device with my phone, but I dont know how to send message from the board 5340. This may be a newbie question. 0.0

Many thanks 

Cong