Field	Type	Required	Description
_id	string	+	Item object id
value	depends on item type	+	New item value.
scale	depends on item type	–	New item value scale. If the scale field is present, the firmware will work with the obtained value in accordance with the specified scale. If the scale field is NOT present, the firmware will work with the obtained value in accordance with the scale from a hub configuration or an item.
source	object	–	Optional. Contains information about the operation source. See Item Value Source reference.