Scan recurrences in RFC-5545 section 3.3.10 format.
Only supported input are weekly, biweekly, monthly listed below
FREQ=WEEKLY;WKST=;INTERVAL=1 - This weekly scan on the specified weekday (e.g. Sunday)
FREQ=WEEKLY;WKST=;INTERVAL=2 - This bi-weekly scan on the specified weekday (e.g. Sunday)
FREQ=MONTHLY;WKST=;INTERVAL=1 - This monthly scan on the specified weekday (e.g. Sunday, starting from the next such weekday based on the time of setting creation)
Agent scan settings for applicaiton scan