Sniffing Connection Data Packets

[Gil]

Hi,

I am using my nRF52832 DK as a sniffer.

I am sniffing a BLE communication between a BLE door lock with a cellphone App.

I can see the device advertises continuously on on channels 37,38,39.

But, when i connect the App to the door lock and send lock/unlock commands (wich are seen by the lock movement), i can not see any MASTER->SLAVE or any form of connection commands.

Instead, I see the door lock keep advertising in channels 37,38,39.

I added a link to a sniffer capture - if required, i can provide more wireshark data.

/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-3646d5b9449d4f018d82eb7b91950cfb/wireshark-capture1.png

Can you help me understand why am i not seeing data?

Thnaks.

[Gil]

I see that the image resolution is poor, so i am attaching the screenshot as file:

[Edvin]

Hello,

When no devices are selected, only the advertising channels are scanned with the sniffer. If you are actually in a connection with the doorlock, or the doorlock supports severaln concurrent connections, and keeps advertising while it is in a connection. That very well be. If not, then it is not the doorlock's advertisement packets you are seeing, but something else.

Try to chose the doorlock in the dropdown menu:

Then the sniffer should follow the device into the connection, outside the advertising channels:

Best regards,
Edvin

[Gil]

I'll try it out. Thanks.

[Gil]

It works great, thanks.

You can close the issue