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]

Hello,

Which board to use with nRF connect. You can find the list of supported boards here: nRF Connect Bluetooth Low Energy

Best regards,

Vidar

[Cong Ma]

I use the nrf5340dk, when I open the BLE app,It came out like this, does it look like a J-LINK problem?

Many thanks

Cong

[Vidar Berg]

Hi Cong,

The nRF5340DK is not supported by this app. Maybe you can use the nRF connect app on Android/iOS and instead program one of the Bluetooth peripheral samples to the DK (https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.0/nrf/samples/samples_bl.html) ?

Vidar