I do not have any other machines to use for testing. When I asked my question, I figured I simply had a config file that needed updated. I can test on a laptop into the server if I add NM to the laptop. However, I only have the one server, so I cannot connect from my tablet to some other NM server.
As for the updated software, I have a general aversion to upgrading unless I also have time to debug and fix whatever the upgrade might break. It is not worth it to me to risk the problems an update might create.
I am using a Samsung Galaxy Tab Pro with the latest app version 5.0.63 on Android 4.4.2. The server has nx version 5.1.62 on it. I haven’t upgraded to 5.2.11 because I don’t want to break my (mostly) working setup.