[WD] - Reliable way to detect and handle FTP time out

Hello,

In my software I would like to detect time out by FTP server.

I have observed that if the user keeps the software inactive for some time the software gets dicsonnected from FTP server so afterwards if the software tries to perform any FTP command on the FTP Server it shows error message.

I checked the manual and could not find any FTP command to check if the connection is still valid or not.

Does anyone know if we can find out if the FTP connection is valid or has timed out?

TIA

Yogi Yang