We need a FTP client that satisfies the following constraints:
- Command-line scriptable, so we can automate it...sorry, FileZilla (?)
- FTPS, as it seems to perform better than SFTP
- The ability to send KeepAlive commands to the FTPS control port during a transfer
- No passwords sent on the command line...sorry, curl
Number 4, above, is critical: we have set KeepAlive in some other clients (e.g., CoreFTP LE) but we seem to have some routing equipment in the server environment which drops our connection when transferring a 7GB+ file. We have also set passive mode and "resume transfer" functionality seems currently broken with this secure file transport server...so we need to download the file in one go.
What FTPS clients might meet our needs?