root@edison:~# vi /lib/systemd/system/sshd.socket
[Unit]
Conflicts=sshd.service
[Socket]
ExecStartPre=/bin/mkdir -p /var/run/sshd
ListenStream=22
# restrict access to wired access for security reasons
# comment this line to remove restriction
BindToDevice=usb0
Accept=yes
[Install]
WantedBy=sockets.target