ssh: keep alive the session

the settings shown below has to be put into config file on the server side

the settings shown below has to be put into .ssh/config on the client side

client will send <number> of packets before disconnecting from the sever

client will send packets every <seconds> to keep the connection alive

thanks to https://www.golinuxcloud.com/keep-alive-ssh-sessions-in-linux/#Why_SSH_connections_close_automatically_after_some_time