Julian Simioni's to accesss *nix machine behind home router (tweaked)

create_tunnel

#!/bin/bash

# 'pax' is simply an alias for one my ssh connections,
# which are configured in your user ssh_config file.
# For more info, see Julian Simioni's original post:
# https://juliansimioni.com/blog/howto-access-a-linux-machine-behind-a-home-router-with-ssh-tunnels/

relay_server="pax"

createTunnel() {
    /usr/bin/ssh -f -N -R 10022:localhost:22 \
                 -L19922:"${relay_server}":22 "${relay_server}"
    if [[ $? -eq 0 ]]; then
        echo Tunnel to relay server created successfully
    else
        echo An error occurred creating a tunnel to relay server. Return code: $?
    fi
}
# works, but reproduces until saturated
#/usr/bin/ssh -p 19922 localhost ls > /dev/null
# nc seems to be working better
/usr/bin/nc -z 127.0.0.1 19922 > /dev/null
if [[ $? -ne 0 ]]; then
    echo Creating new tunnel connection to relay server.
    createTunnel
fi

needs to be tweaked still

EDIT: should be good to go. Be sure to check out the OP by Julian Simioni.

EDIT 2:

As of this writing, I am running this script in combination with caffeinate in the following fashion.
* * * * * /usr/bin/caffeinate -ims /Users/ramos/bin/create_tunnel

works, but reproduces until saturated

Hmm I remember having that problem but I fixed it somehow. I'll try to remember why and i'll also publish my current version of the script soon

Cool! I've wondered if there was some quirk to config beyond my understanding -- which is entirely probable.