Hello,
I'm unable to capture packets using the sniffer. Here are details regarding my set-up:
System: Debian 9.4 with kernel 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3 (2017-12-03) x86_64 GNU/Linux
Sniffer target: pca10040.
Wireshark version: 2.6.1 (built from source, with all default options, except --enable-setuid-install)
Segger J-Link version: SEGGER J-Link Commander V6.16c (Compiled Jun 16 2017 18:16:23)
Observations and symptoms:
The target shows up as interface /dev/ttyACM0. I can use minicom to verify that data is being received on that interface. On the pca10040 target, LED1 is dark; LED2 is blinking quite fast and at a somewhat random cadence, probably indicating received packets; LED3 and LED4 are on solid.
I checked for a permissions problem. Here are some things I checked:
saturn:~> l /dev/ttyACM0
crw-rw-rw- 1 root dialout 166, 0 Jul 6 10:48 /dev/ttyACM0
saturn:~> groups
ken dialout cdrom floppy audio dip video plugdev scanner bluetooth netdev plex wireshark eclipse
saturn:~>
So, it seems like permissions are OK. Also, I can use minicom on that interface from a non-root account. And, I have run a lot of other applications on the same target with no connectivity issues.
I installed the python script nrf_sniffer.py and the subdirectory SnifferAPI in the wireshark extcap directory as specified in the documentation:
saturn:/usr/local/lib/wireshark/extcap> l
total 436
-rwxr-xr-x 1 ken ken 20294 Jan 1 1980 nrf_sniffer.py
-rw-r--r-- 1 ken ken 43 Nov 23 2017 nrf_sniffer.bat
drwxr-sr-x 4 root staff 4096 Jul 3 12:05 ..
-rwxr-xr-x 1 root staff 198864 Jul 5 18:00 androiddump
-rwxr-xr-x 1 root staff 107648 Jul 5 18:00 randpktdump
-rwxr-xr-x 1 root staff 97168 Jul 5 18:00 udpdump
drwxr-sr-x 3 root staff 4096 Jul 5 18:00 .
drwxr-sr-x 2 ken ken 4096 Jul 6 10:20 SnifferAPI
When I start up wireshark, highlight the "nRF Sniffer: /dev/ttyACM0" interface, and then begin a capture, a window pops up immediately indicating "No packets captured."
Additionally, the following appears on the default console:
CaptureEvent [ 1 ]: 256 with session
CaptureEvent [ 2 ]: 1
CaptureEvent [ 257 ]: 2 with session
CaptureEvent [ 257 ]: 4 with session
CaptureEvent [ 2 ]: 8
CaptureEvent [ 2 ]: 16
Any ideas on what's going on or what to try next?
Thanks.
--ken
