Sub class this and implement the code to handle callbacks generated when we send or receive data. This can be used to give the user an indication it is still working on a large transfer, or abort the transfer. This class is used with %Net.FtpSession only.
Subclass this and add any code that you want called at regular intervals when receiving data from the Ftp server. abstract method StoreCallback(Command As %String)
Subclass this and add any code that you want called at regular intervals when sending data to the Ftp server.