solar_collector/service/vpnc@.service

[Unit]                                                                                                                                                                  
Description=VPNC connection to %i
Wants=network-online.target
After=network.target network-online.target

[Service]
Type=forking
ExecStart=/usr/sbin/vpnc --pid-file=/run/vpnc@%i.pid /etc/vpnc/%i.conf
PIDFile=/run/vpnc@%i.pid

[Install]
WantedBy=multi-user.target