RE: NRF Sniffer doesn't detect the board

roryelila — Tue, 21 Nov 2023 04:51:07 GMT

NRF Sniffer is a useful tool for debugging Bluetooth low energy (BLE) applications by detecting packets between the selected device and the device it is communicating with, even if the link is encrypted.

incredibox

RE: NRF Sniffer doesn't detect the board

Karl Ylvisaker — Thu, 09 Nov 2023 13:34:15 GMT

Hello,

Thank you for the clarifications - the steps you have taken looks correct to me.

[quote user="Jacek Kusmierczyk"]So It seems like the program detects the board, but closes the connection immediately. This replicated on 2 different nrf52840dk and 2 different computers[/quote]

Perhaps there could be an issue with wireshark - which version of wireshark are you using?
Were both of these computers Ubuntu 22.04? If so, could you possibly try this on a windows computer, or other linux distribution, to see if that could be the issue?

Best regards,
Karl

RE: NRF Sniffer doesn't detect the board

Jacek Kusmierczyk — Thu, 09 Nov 2023 12:40:54 GMT

I programmed the nrf52840dk with the command nrfjprog -f nrf52 --program sniffer_nrf52840dk_nrf52840_4.1.1.hex --verify --recover --reset
I unpacked the contents of the extcap folder to the ~/.config/wireshark/extcap and downloaded dependencies using python3 -m pip install -r requirements.txt

this is the output of running ./nrf_sniffer_ble.sh --extcap-interfaces in ~/.config/wireshark/extcap folder

extcap {version=4.1.1}{display=nRF Sniffer for Bluetooth LE}{help=https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE}
control {number=0}{type=selector}{display=Device}{tooltip=Device list}
control {number=1}{type=selector}{display=Key}{tooltip=}
control {number=2}{type=string}{display=Value}{tooltip=6 digit passkey or 16 or 32 bytes encryption key in hexadecimal starting with '0x', big endian format.If the entered key is shorter than 16 or 32 bytes, it will be zero-padded in front'}{validation=\b^(([0-9]{6})|(0x[0-9a-fA-F]{1,64})|([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2}) (public|random))$\b}
control {number=3}{type=string}{display=Adv Hop}{default=37,38,39}{tooltip=Advertising channel hop sequence. Change the order in which the sniffer switches advertising channels. Valid channels are 37, 38 and 39 separated by comma.}{validation=^\s*((37|38|39)\s*,\s*){0,2}(37|38|39){1}\s*$}{required=true}
control {number=7}{type=button}{display=Clear}{tooltop=Clear or remove device from Device list}
control {number=4}{type=button}{role=help}{display=Help}{tooltip=Access user guide (launches browser)}
control {number=5}{type=button}{role=restore}{display=Defaults}{tooltip=Resets the user interface and clears the log file}
control {number=6}{type=button}{role=logger}{display=Log}{tooltip=Log per interface}
value {control=0}{value= }{display=All advertising devices}{default=true}
value {control=0}{value=[00,00,00,00,00,00,0]}{display=Follow IRK}
value {control=1}{value=0}{display=Legacy Passkey}{default=true}
value {control=1}{value=1}{display=Legacy OOB data}
value {control=1}{value=2}{display=Legacy LTK}
value {control=1}{value=3}{display=SC LTK}
value {control=1}{value=4}{display=SC Private Key}
value {control=1}{value=5}{display=IRK}
value {control=1}{value=6}{display=Add LE address}
value {control=1}{value=7}{display=Follow LE address}

I tried scrolling and it's nothing more there

when I unplug the nrf52840dk then these are the logs when I run Refresh Interfaces

09-Nov-2023 13:38:31 (+0100) INFO: Software version: 4.1.1
09-Nov-2023 13:38:31 (+0100) INFO: Started PID 71302
09-Nov-2023 13:38:31 (+0100) INFO: Namespace(capture=False, extcap_interfaces=True, extcap_interface=None, extcap_dlts=False, extcap_config=False, extcap_capture_filter=None, fifo=None, extcap_control_in=None, extcap_control_out=None, extcap_version='4.0', device='', baudrate=None, only_advertising=False, only_legacy_advertising=False, scan_follow_rsp=False, scan_follow_aux=False, coded=False)
09-Nov-2023 13:38:31 (+0100) INFO: Exiting PID 71302

So It seems like the program detects the board, but closes the connection immediately. This replicated on 2 different nrf52840dk and 2 different computers

RE: NRF Sniffer doesn't detect the board

Karl Ylvisaker — Thu, 09 Nov 2023 08:14:21 GMT

Hello,

Which step of the setup are you on?
Have you successfully programmed the device with the appropriate sniffer .hex?

Please also make sure that 'scroll down' inside the external interfaces list in wireshark - the UI is a little bad her, so sometimes some instances will be hidden on the bottom without indicating that you can scroll down to it.

Best regards,
Karl