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19 REST API Guide  OpenManage Essentials | Revision A02
2.2.2 Changed device information
The changed device information can be obtained by the following REST API:
<BASE_URI>/Devices/{AddedOrUpdatedTimestamp}&{DeletedTimestamp}
The values of the AddedOrUpdatedTimestamp and DeletedTimestamp would have been obtained by a
previous call to the <BASE_URI>/Devices REST API.
This particular REST API will typically be used by a consumer that does its own device management and
tracking periodically based on a particular polling cycle. Instead of getting the whole list of devices to
determine the changes, the consumer will be able to retrieve only the changed device information based on
the timestamps obtained in a previous call.
For example, if the device listing was retrieved by an OpenManage Essentials REST consumer at time t1 and
the consumer needs to get information about the devices that were added or modified or deleted at time t2
where t2 > t1, then the consumer, using the AddedOrUpdatedTimestamp and DeletedTimestamp obtained
from the last call at t1, can get a list of only the changed and deleted devices.
Figure 2 Retrieving changed device information