Serving history queries from oBIX clients

Starting in obixDriver build 3.2.17 and later, histories exposed to oBIX clients provide a pre-defined set of query options, available as URIs using the HTTP “GET” mechanism (without an oBIX “op”). The available pre-defined queries match those provided in time range selections in the History Chart and History Table views, for example, “Today,” “Last 24 Hours,” “Yesterday,” and so forth. See Figure 6.

Figure 6. Example history query options for oBIX client connected to NiagaraAX station


Example history query options for oBIX client connected to NiagaraAX station

Note that for a few pre-defined history queries (Year to Date, Last Year), a default limit for number of records returned is used. If necessary, a client can modify any of the standard history queries.