Linux: Setting up a call home function

File: /etc/systemd/system/callhome.service # Mode 644.

[Unit]
Description=callhome
Documentation=man:ssh
After=network-online.target

[Service]
Type=idle
ExecStart=/usr/bin/ssh -o "ServerAliveInterval 30" -o "ServerAliveCountMax 3" -o "ExitOnForwardFailure=yes" -N -R 2233:localhost:22 rsupport@jumpbox.define-technology.com
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
RestartSec=57s

[Install]
WantedBy=multi-user.target

Start and enable the service on reboot

systemctl daemon-reload
systemctl enable callhome
systemctl start callhome