nRF Sniffer with Wireshark, Error from extcap pipe

[Mikael_2]

Hi,

I have followed the nRF Connect SDK Fundamentals and BLE Fundamental courses and come to Lesson 6 Bluetooth LE sniffer.

Everything has worked until this but now I get errors from Wireshark.
I all starts well, Wireshark starts capture ok, sniffing starts ok, but when I stop the capture I get error "Error from extcap pipe C:......"

If I try a capture filter I get errors like: "Error from extcap pipe: Acess denied" and "Unable to send control message: Invalid argument"

A careful check shows the errors already when running "nrf_sniffer_ble.bat --extcap-interfaces" during installation where
 I get "invalid escape sequence '\s' *{validation=^\s((37|38|39)s*7{1}\s$}{requires=true}" % CTRL_ARG_ADVHOP)"

See attached screen dumps.

Any idea of how to solve this?

[Felix Shih]

Using older python version sometimes avoid the error, I use python v3.9.

But I am not sure it's your root cause.

[Dustin Huff]

Upon executing "nrf_sniffer_ble.bat --extcap-interfaces" during installation, a thorough check reveals the issues already, as I receive "illegal escape sequence '\s' *{validation=^\s((37|38|39)s*7{1}\s$}{requires=true}" % CTRL_ARG_ADVHOP)"  bitlife online

[Mikael_2]

I use latest python 3.13.0 Maybe too new?

[Hung Bui]

Please try downgrade Python. 
Have a look here: https://devzone.nordicsemi.com/f/nordic-q-a/107828/invalid-escape-sequence-s

[Mikael_2]

Thank you,

I added \ characters as suggested in that thread.
The error messages are gone and it seems to work now :-)
Still running python 3.13.0