Why it's not working to get the entire dir. of site page:
https://redmine.kannel.org/projects/...2/entry/trunk/

The page is shown and can be looked on
https://redmine.kannel.org/projects/...02/show/trunk/

use recursive -m or -l0 to no avail,
Why and how to solve ?

you can use -v and/or -d, -o logfile to gather more info about what's happening. You need to look for error messages or something suspicious.
From the other hand you must not use sudo with wget.

1 members found this post helpful.

This worked:
By default, wget honors the robots.txt file on the server. To change that you need to use "-e robots=off". The server you are trying does not want automated downloads. If you tell wget to ignore that, you should consider waiting between each file download because the server might still notice that this is an automated download if you download too fast and thus block access after a while. The option -w 1 tells wget to wait 1 second between each download.
You can try without waiting and see if you can get all files without getting blocked.