[Unit]
Description=Smart Modem Getty(mgetty)
Requires=systemd-udev-settle.service
After=systemd-udev-settle.service

[Service]
Type=simple
ExecStart=/usr/sbin/mgetty /dev/%i
Restart=always
PIDFile=/var/run/mgetty.%i

[Install]
WantedBy=multi-user.target