autossh

• Homepage: https://www.harding.motd.ca/autossh/
• Man: https://linux.die.net/man/1/autossh

apt install autossh
brew install autossh

• Loop waiting to connect to server: AUTOSSH_POLL=5 AUTOSSH_GATETIME=0 autossh -M 0 -o ServerAliveInterval=5 -o ServerAliveCountMax=1 YOUR_SERVER_NAME_OR_IP

See also

• Autossh
• telnet, netcat, ncat, socat, ngrok
• SSH clients: ssh (OpenSSH), putty, plink, mosh, paramiko, conch pssh, sshpass and autossh