Please connect to your OpenWrt device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button:
Remember to redact passwords, MAC addresses and any public IP addresses you may have:
There is nothing in the link I've posted above to indicate any use of pppd at all in NetworkManager-ssh. Please link to any detail indicating it if you have a url.
To receive assistance you need to provide the requested information from your openwrt router.
If you don’t want to do this I suggest closing the thread as no one will be able to help you.
I have looked at the GitHub repo. The application is a gui front end to ssh. There is nothing unique that is different to setting up ssh normally. Just port forward the ports you want to use in openwrt and the router part will be done.
As I've already said before, I wish this thread to be findable by other openwrt users looking for help using NetworkManager-ssh. I feel like this should be apparent from the first post that I'm not really looking for input from people not familiar with this specific piece of software, but I'm reiterating here again just to be sure.
Normally I use sshuttle in order to accomplish the same thing as this but the integration with gnome / UI is a bit cleaner, however I'm not particularly familiar enough yet with TAP / TUN devices yet to begin messing with my firewall rules.
I feel like I've adequately explained my reasons twice now, if you are unable to comprehend them, it's no longer productive to continue to try to explain.
Also, if it's not already clear, OpenWRT doesn't support or use NetworkManager. Nor does it use a number of the dependencies NetworkManager relies on. Nor does it have a GUI.
So, in short, no-one is likely to have previously got it working with OpenWRT. And no-one is likely to, in the future, get it to work with OpenWRT.