Field	Type	Required	Description
_id	string	+	ID of a group
name	string	+	A name of a group
categories	array of objects	–	An array of category filters
devices	array of device IDs	–	Device identifiers to be added to a set defined by categories collection
exceptions	array of device IDs	–	Device identifiers to be excluded from a Device Group
persistent	bool	–	Defines if an object is persistent
sync	bool	+	If true – a name of a group has been changed. If false – other fields, but not a name have changed