Python script to send files from RPi to a Windows PC executed from the RPi and not from the PC

Question

I'm very new to the RPi world. I have a Raspberry Pi Zero and I want it to send a file via SCP to my Windows computer.

I can enter my RPi via SSH from my PC and I can extract files from it and move them to my PC via SCP.

I've also created a program in Python using Paramiko to extract files from RPi. The program has to be executed in my PC.

import paramiko

#Connect my PC to my RPi via SSH
ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_client.connect("00.00.000.000", port = 0, username = "username",password="password")

#Move file from RPi to my PC
ftp_client=ssh_client.open_sftp()
ftp_client.get("path_file_in_RPi","path_destination_in_PC")
ftp_client.close()

But what I want now is (using Python and Paramiko if possible) to move a file from my RPi to my PC but connecting my RPi to my PC instead of my PC to the RPi. I could access my RPi from my PC using SSH and then execute this program inside RPi and have my RPi connect to my PC and transfer some files automatically.

How can I do this? I've read that I have to generate a SSH server in my computer. What does that mean? Having a link between my PC and my RPi is not enought? If so, how do I create that server on my Windows machine? and what commands should the python script inside my RPi should have as to call my PC to send files to it instead of me from the PC to call the RPi and transfer those same files to my PC?

Answer 1

I'd suggest reading up on SSH a little more to get more familiar, so maybe take a look at the Wikipedia article https://en.m.wikipedia.org/wiki/Secure_Shell or Google it and check out promising articles.

However in essence the server/client thing is really just the side of the connection and role that each computer has. In answer to your question "Having a link ... is not enough?" - you need one side to be listening, so it can receive connections. In the scenario you're looking at here (have the process run from the RPi and send a file to the PC) the PC would indeed be the server - but don't be put off!

For a Windows PC, then you can find details of the software needed with Google (again), but what seems to be a reasonable guide is here on the WinSCP site: https://winscp.net/eng/docs/guide_windows_openssh_server

Once you've done that, the script will be similar to what you have, but you'd need to use a put instead of a get (since from the perspective of the script things are now the other way round):

put(localpath, remotepath, callback=None, confirm=True)

Full details are here: http://docs.paramiko.org/en/2.4/api/sftp.html#paramiko.sftp_client.SFTPClient.put