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I asked a somewhat similar question to this recently (see Rsync-like downloads over adb?), but what I'm asking here is a little bit different.

Also, if this question belongs in a different forum, I apologize in advance, and am happy to repost it elsewhere.

I want to set up an actual rsync server on my Android device, but one which works without a WiFi connection. In other words, I want it to work over a normal "cell phone" data connection. The only ways I've been able to get an rsync server to work so far is over a WiFi connection.

I know how to determine the device's assigned IP address in real time (even with a cell-based, non-WiFi data connection) and how make that IP address available to sources outside of the device. But I haven't been able to get the device to listen on that specific IP address when I do not have a WiFi connection.

Does anyone know if this is even possible?

Thank you in advance.

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    Does this answer your question? How to connect to Android through SSH over 3G/4G public IP?. If it is an ssh or an rsync server does not matter, as you usually don't get a public IP in the cell phone network you can't access your device from outside.
    – Robert
    May 20 '20 at 17:53
  • Actually, the topic you suggested does address my question, so I will move over to there. Even without a public IP, there might be a way to accomplish this via port forwarding to a proxy -- or something similar. I'll ask under that topic. Thank you.
    – HippoMan
    May 20 '20 at 18:43