Running an rsync server on an Android device over a non-WiFi, cell-based connection?

I asked a somewhat similar question to this recently (see https://android.stackexchange.com/questions/224753/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.