I've been using Termux over SSH for quite a while now. I've always done so over WiFi. This works reasonably well at home, where I control the IP Addresses. In other networks it was more annoying, because I always had to run ifconfig first, to get my IP. But the big annoyances start when you want to use it in a place that has no WiFi network available. Previously, I used an Android tablet and a keyboard. With this I set up a WiFi direct connection between my phone. It's wonky and sometimes requires to restart both devices before working again, but it works.

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With the brilliant Termux terminal emulator app you can run an SSH server on your Android.

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