I am positive that the ssh connexion is established but I can't see if the command was really sent, I just got no result at all.

The code you posted works for me. I would suggest that you need to debug further - for example, you say you get "no result at all", are you referring to the ls command? If yes, have you compared this to the output of ssh X.X.X.X ls (becuase some users' home directories are empty except for .dotfiles that don't show up in a regular ls)? Have you tried ssh user@X.X.X.X "/opt/LSS/bin/ueadmin_cli -o delete -I IMEI" from the command line? I also note you don't check the return value of the ->channel and ->exec calls as shown in the Net::SSH2 documentation, I strongly recommend you do that as well.