Use CDPR in NetworkManager dispatcher script

[netconnex]

Hi Tim, I'm sorry this is quite specific, but I can't wrap my head around why this is not working.

I want to use the output of your cdpr tool for some actions in a NetworkManager dispatcher script.
I wrote a test script and put it in /etc/NetworkManager/dispatcher.d/
In this script, your cdpr tool is executed with -d eth0 -t 10 and the output saved to a text file for debugging.

When I directly execute this script with sudo, everything works. When NetworkManager automatically executes the script, it seems like cdpr will finish instantly, without waiting for a CDP response:

CDP Output:
Cisco Discovery Protocol Reporter
Version 3.0.4 by Tim Dorssers

Timeout enabled for 10 seconds
Use -h option to see usage

Using device eth0

Sending on 1 interface(s)
Done

Press any key to quit or wait for timeout
Listening on 1 interface(s)

Done

This happens instantly, not waiting for 10 seconds.
Do you have any idea why this might be the case?