Would it be possible to use (S)FTP protocol in conjunction with push technology rather than pull? Perhaps websockets since both use TCP?

Say, something like an external server periodically sending my server files and when a new file arrives, I will get a notification. This instead of constantly polling my directory to check if there are files in it.

I think I can see this done with an Angular page that gives me a notification when a new file arrives on my FTP.

I think it might turn into an interesting little hobby project..