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OK I wrote down three advanced ASIAir tutorials.
The first one details how to add your public openssh key to the pi user on ASIAir so you can connect via openssh and perform all kinds of maintenance. See my gist called Add your public openssh key to ASIAIR.
The second one details how to circumvent WIFI issues by using a fixed wired IP address. I have set it up such that I can connect the ASIAir via a cable to my home network router so I can access it via the fixed wired IP address. When in the field, my iPad has a fixed IP address in the same range on the lightning to ethernet adapter so it there can connect to the same IP address of the ASIAir as well. See my gist called Set up a fixed ethernet IP address on ASIAir.
The third one explains how to set up a VPN client on the ASIAir. I'll repeat the same disclaimer here. Setting up a VPN connection may potentially introduce a security risk and any damage encountered following this tutorial is for your own risk. I will not take any responsibility whatsoever. Also make sure to check with your hosting company and request permission to set up a VPN connection first if you want to use the ASIAir in a remote hosting site. As you can read in the gist, I chose a particular VPN solution called ZeroTier. It works for me and my requirements but yours may be different. It is up to you to choose a VPN solution and I again will not hold any responsibility for the choice you make nor will I recommend any VPN solution. See my gist called Set up VPN on ASIAir.