BLE Sniffer with nRF52840

[Bhagyashree badiger]

Hi,

We are using nRF52840DK. Our main object is to collect the log for the BLE. We have installed the nRF Sniffer software and wireshark tool to extract the BLE Packets. nrf52840 dk how it will simultaneously connect to mobile nrf connect with wireshark. when we connect the wireshark not able to see the connection in nRFconnect mobile App?

[SwRa]

HI Bhagyashree,

It is not possible to use a single DK as a sniffer and a central/peripheral simultaneously.. When you're using the nRF52840DK as a sniffer with Wireshark, it's programmed with the nRF Sniffer firmware. See here: https://docs.nordicsemi.com/bundle/nrfutil/page/nrfutil-ble-sniffer/guides/programming_firmware.html  This firmware is specifically designed to capture BLE packets between other devices, not to act as a BLE peripheral or central device itself. This is why you can't simultaneously connect to it with nRF Connect Mobile.

So in addition to a DK (DK1) that is being connected to the nRF Connect application which already has an application running on it, you will need a separate DK (DK2) which is programmed with the sniffer firmware. Place DK2 between DK1 and the mobile (the communicating devices) to capture the sniffer trace. You can read more about nRF sniffer in detail here: https://docs.nordicsemi.com/bundle/nrfutil/page/nrfutil-ble-sniffer/guides/requirements.html 

Best Regards,

Swathy

[Bhagyashree badiger]

Can we use sniffer software in mobile nRF connect

[SwRa]

Hi Bhagyashree,

Bhagyashree badiger said:

Can we use sniffer software in mobile nRF connect

No.. That's not how it works.. A sniffer works by capturing the packets send between two BLE devices.. You will need to flash the sniffer firmware on to a supported device (this has been explained in detail in the documentation) and connect to Wireshark to see the captured signals. Please do refer the documentation.

Regards,

Swathy

[Bhagyashree badiger]

Thank you for the reply