Disconnection issues with ble_app_hrs example from nRF5_SDK_17.1.0

[Saeid]

I am trying to implement the ble_app_hrs example from nRF5_SDK_17.1.0 and my board is nRF52840 Dongle.

After program the board, the board can advertise and I can find the DEVICE_NAME "Nordic_HRM" on mobile app, but when I try to click on the connect icon on the app, it connected for 1 sec and disconnect by itself. This the error that I got from mobile app.

Could you please advise me on this issue?

[Amanda Hsieh]

Hi, 

Are you using ble_app_hrs for the pac10059 project? Did you modify the example code? If so, what is that? 

Please provide the log on the phone from the nRFConnect app. 

I would suggest you use nRF52840DK for development because Dongle doesn't have the onboard debugger to provide debug log. 

Regards,
Amanda

[Saeid]

Dear Amanda,

Thank you for your reply and help.

Yes, I am using ble_app_hrs for the pac10059. I didn't modify the code, just compile the original one with 

Segger embedded studio and use nRF connect programmer to program the dongle.

the file path:

nRF5_SDK_17.1.0_ddde560\examples\ble_peripheral\ble_app_hrs\pca10059\s140\ses

I have purchased three unit of the dongle and I don't have access to nRF52840DK. 

Can I connect a serial-to-usb converter to the dongle to see the log ?

The below is the log of  nRFConnect app

Could you please advise me on that ?

Thanks

[Saeid]

Hi Amanda,

This the log output of sniffer for the device

what is the next ? how do i know where is the issue? 

[Amanda Hsieh]

Hi,

Please upload the sniffer log (.pcapng file) which starts to log before it connects with the phone until the disconnection. 

-Amanda

[Saeid]

Could you please guide me to haw to starts  the log on sniffer ?

Can I select a specific device in sniffer to be logged? 

[Amanda Hsieh]

Hi, 

Please have a look at nRF Sniffer usage. 

You can select the device from the Device list. If the device is connected, it will show in the Device list. So please start the log before the connection.

-Amanda 

[Saeid]

I started to log the data and applied a filter to make ensure the sniffer only display my dongle communication with my Mobile phone.

This is the result of the communication:

it seems the dongle is sending SCAN_RSP to my mobile app.

the details of respond is in the picture,

Could you please advise on that ?

What is the issue that dongle couldn't connect to the mobile app?

[Amanda Hsieh]

Hi, 

I think you might look at the wrong device. 

You should be able to see the device name as you see in the nRF Connect with the phone. 

-Amanda