RE: nrf sniffer : no ble packets captured

fezai.fethi — Sun, 06 Dec 2020 21:28:59 GMT

So after many tries, I have just succeeded.

I do not have any explanation but it works.

I have noticed that if I call many time the nrf_sniffer_ble.sh script, the output will not be the same:

First time

./nrf_sniffer_ble.sh --extcap-interfaces

extcap {version=3.1.0}{display=nRF Sniffer for Bluetooth LE}{help=www.nordicsemi.com/.../nRF-Sniffer-for-Bluetooth-LE}

interface {value=/dev/ttyACM0}{display=nRF Sniffer for Bluetooth LE}

control {number=0}{type=selector}{display=Device}{tooltip=Device list}

control {number=1}{type=string}{display=Passkey / OOB key}{tooltip=6 digit temporary key or 16 byte Out-of-band (OOB) key in hexadecimal starting with '0x', big endian format. If the entered key is shorter than 16 bytes, it will be zero-padded in front'}{validation=\b^(([0-9]{6})|(0x[0-9a-fA-F]{1,32}))$\b}

control {number=2}{type=string}{display=Adv Hop}{default=37,38,39}{tooltip=Advertising channel hop sequence. Change the order in which the siffer 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=3}{type=button}{role=help}{display=Help}{tooltip=Access user guide (launches browser)}

control {number=4}{type=button}{role=restore}{display=Defaults}{tooltip=Resets the user interface and clears the log file}

control {number=5}{type=button}{role=logger}{display=Log}{tooltip=Log per interface}

value {control=0}{value= }{display=All advertising devices}{default=true}

Second Time:

./nrf_sniffer_ble.sh --extcap-interfaces

extcap {version=3.1.0}{display=nRF Sniffer for Bluetooth LE}{help=www.nordicsemi.com/.../nRF-Sniffer-for-Bluetooth-LE}

control {number=0}{type=selector}{display=Device}{tooltip=Device list}

control {number=3}{type=button}{role=help}{display=Help}{tooltip=Access user guide (launches browser)}

control {number=4}{type=button}{role=restore}{display=Defaults}{tooltip=Resets the user interface and clears the log file}

control {number=5}{type=button}{role=logger}{display=Log}{tooltip=Log per interface}

value {control=0}{value= }{display=All advertising devices}{default=true}

The interface is missing.

If I am not wrong, at first, wireshark calls the script to get the interface, and if we want to capture packets it will call another time the same script with different parameters.

The workaround is simple, after wireshark indentifies the inferface, I disconnect the Dongle and start capturing.

RE: nrf sniffer : no ble packets captured

fezai.fethi — Sun, 06 Dec 2020 19:26:22 GMT

Hi Dmitry,

Thank you for your prompt reply.

I have installed a newer version of wireshark 3.2.8-0.1 from Debian testing.

I still can’t capture BLE Packets but the message from wireshark is not the same anymore :

Output from the Terminal

Main Warn 0 duplicates of "nRF Sniffer for Bluetooth LE could not find interface: /dev/ttyACM0" were suppressed

As you can see, I am a member of these groups :

groups $USER

##### : #### root dialout cdrom floppy sudo audio dip video plugdev netdev bluetooth lpadmin scanner docker wireshark

RE: nrf sniffer : no ble packets captured

Dmitry — Sun, 06 Dec 2020 17:53:10 GMT

Hi,

try to update wireshark to more recent version (for me, the dongle works fine with wireshark 3.2.3 on Ubuntu 20.04)