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 "UserKnownHostsFile=/dev/null" -o "StrictHostKeyChecking=no" -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

# if you need to copy out a public key from anydesk or some other crap Remote Desktop app
Create a cl1p example:
curl -H "Content-Type: text/html; charset=UTF-8" -X POST --data "`cat ~/.ssh/id_rsa.pub`" https://api.cl1p.net/dp-pubkey

View a cl1p example:
curl https://api.cl1p.net/dp-pubkey