2016-08-01 : initial release
2017-06-17 : added last update check
2017-01-03 : fixed inventory function for bad ino data
2017-01-03 : fixed lastupdate check
2018-03-08 : fixed update status,  changed snmp scan function and inventory
2018-03-15 : code cleanup
2020-06-07 : code cleanup
2020-06-08 : changed snmp-scan function
2021-04-29 : added option to adjust version string time format