How to do scheduled SFTP through an ABAP code

Hi All,

i have a scenario like this:

XI -> Firewall -> UNIX machine <- 3rd PARTY.

Since 3rd parties are putting their files on UNIX machine, so after UNIX machine there is a firewall so that the 3rd parties cant access the XI machine.

Since firewall is there, so i cant do normal FTP to get files from UNIX to XI....Moreover it is client requirement to do SFTP to get files from UNIX to XI.

So i have to do SFTP to get the files from UNIX machine.Moreover i have to bring the files at a scheduled time on weekly basis.

i have seen the SAPFTP function module in SE37.

<b>i have to write an ABAP program to do this scheduled SFTP to get the specified files at scheduled times only.</b>

Can anybody suggest how to do this thing.

Thanks,

Rajeev Gupta