CentOS - May 2015 - nmcli, pppoe (ADSL login and password)

Hi all,

My target is: CentOS 7 on a X less gateway
My internet provider provides a pppoe connection with a login and a password

On CentOS6, I used to setip it up with rp-pppoe wizzard and it works: it 
sets up the needed things to make the network init script launch the 
connection at boot.
I would like to learn how to do it with NM and CentOS 7.

How to invoke nmcli in order to have it connected at boot?

Thank you.