I'm not sure if possible, but I like to shutdown my NAS (Synology DS) via a DO button.
I can enable FTP, SSH and Telnet. I don't have any idea how to do, maybe someone can help me?
Sysnology have a forum:
People there are more likely to know how to shut down the NAS than anyone here. Once you know the command we can help you turn it into an Opus button.