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Table 37 describes the details of the Embedded DataChange Subscription Server Facet. This Facet specifies the minimum level of support for data change notifications within subscriptions. It includes limits which minimize memory and processing overhead required to implement the Facet. This Facet includes functionality to create, modify and delete Subscriptions and to add, modify and remove Monitored Items. As a minimum for each Session, Servers shall support one Subscription with up to two items. In addition, support for two parallel Publish requests is required. This Facet is geared for a platform such as the one provided by the Micro Embedded Device Server Profile in which memory is limited and needs to be managed.

Table 37 – Embedded DataChange Subscription Server Facet

Group	Conformance Unit / Profile Title	Optional
Monitored Item Services	Monitor Basic	False
Monitored Item Services	Monitor Items 2	False
Monitored Item Services	Monitor QueueSize_1	False
Monitored Item Services	Monitor Value Change	False
Subscription Services	Subscription Basic	False
Subscription Services	Subscription Minimum 1	False
Subscription Services	Subscription Publish Discard Policy	False
Subscription Services	Subscription Publish Min 02	False