Never did it myself but, you that is what you have to do in general.
on the Leaf-Bot's Box initiate a ssh-connection with the following..
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ssh -f -L <some-avail-localport>:127.0.0.1:<hubbot's-port> <user>@<hub's-box-address>
-f Forks the ssh-client to the background and -L opens a port on the calling box, that redirects everything it gets to the hub's port.
Now you add your bot with
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.+bot <hub> 127.0.0.1:<some-avail-localport-you-just-defined-above>
Tell me if it worked
