I have Motion installed on my PI and having difficulty trying to control the threshold via the command line.

Motion's wiki suggests that this type of control can be done using cron like this:

0 9 * * * root /usr/bin/lwp-request http://localhost:8080/0/detection/start > /dev/null

So i tried this on the command line:

 /usr/bin/wget http://localhost:8091/0/config/set?threshold=4000 > /dev/null

and goth this:

Resolving localhost (localhost)... 127.0.0.1, ::1
Connecting to localhost (localhost)|127.0.0.1|:8091... connected.
HTTP request sent, awaiting response... 401 Authorization Required
Authorization failed.

I tried this on my laptop's browser connected to the same network:

  http://192.168.1.51:8091/0/config/set?threshold=2000&username=myusername&password=mypassword

and it appeared to work without having to enter my username and password manually.

so i then tried on the command line:

sudo /usr/bin/wget http://192.168.1.51:8091/0/config/set?threshold=4000&username=myusername&password=mypassword >/dev/null

and got :

Connecting to 192.168.1.51:8091... connected.
HTTP request sent, awaiting response... 401 Authorization Required
Authorization failed.

[1]-  Exit 6                  sudo /usr/bin/wget http://192.168.1.51:8091/0/config/set?threshold=4000
[2]+  Done                    username=myusername

1. Did this not work because of having control_authentication set up?

2. Is it possible to control motion in this way with authentication set up if so how?

3. Am I approaching this in the correct way?