The interval in seconds that the server is sent a wakeup message during large transfers.
During very large transfers some servers timeout, meaning that the transfer is not correctly completed. If this value is set to 0, no wakeup messages are sent. Note that many servers can't cope with a NOOP sent during a transfer, so only set this property if you are having timeout problems with very large transfers. It can result in receiving replies to NOOP with subsequent commands, so use with caution and check your log files.