Basis for file transfer & multithreading server: http://www.bogotobogo.com/python/python_network_programming_server_client_file_transfer.php

More info on threading & socket:

https://docs.python.org/3/library/threading.html

https://docs.python.org/3/library/socket.html

DONE:

• Implement protocol for client-server interaction(file upload, file deletion)
• send MD5SUM.txt
• Client GUI
• Implement MD5SUM check to find file difference
• Create module to check file and simultaneously compare to current MD5SUM.txt and return the update such as insertion or deletion. If there is a change then create new MD5SUM.txt
• main.py to connect gui and modules. also to automatically do the file checking with server

PROTOCOL NOTES:

• MD5SUM_COMPARE : get file difference from server
• MISSINGCLIENT : file missing in client -> download new file
• MISSINGSERVER : file missing in server -> delete in client
• FILES_MATCH : end of file compare
• FILE_UPLOAD : new file from client
• FILE_DELETE : client deletes file
• END_FILE_TRANSFER : end of file data -> so that file can be closed