obixDriver-ObixPointDeviceExt
This component (default name Points) is the container for Obix proxy points under an ObixClient. It creates and manages a single watch used for all points that are currently read-subscribed.
The default and primary view for the Points extension is the Obix Point Manager.
NOTE: The R2ObixClient and R2PointDeviceExt use different points extensions with additional properties related to the discovery of R2 objects.
A watch is not really change–of–value function. The basic mechanics of a watch are as follows:
- The client requests a watch (object) to be created on the server.
- The client registers (and unregisters) objects included in the server’s watch, using hrefs. The standard subscription mechanism
is used on the
- The client periodically polls the watch on the server at the defined Watch Interval (above).
- The server returns a list of any changes in the watched items (since the last poll).
Figure 10. Obix Point Device Extension properties
To access these properties, right-click the Obix Network in the Nav tree, click , expand or double-click the ObixClient, and expand Points.
Three properties configure the watch.
| Property | Value | Description |
|---|---|---|
| Watch Interval | hours minutes seconds (defaults to 2 seconds) | Controls the polling of the watch subscription (how often the client should poll the alarm watch). To reduce the load on theplatform, increase this value to 10 seconds or more. |
| Watch Uri | read-only | Defines the Universal Resource Identifier for the watch. |
| Debug Watch | true or false (default)
|
Enables and disables the use of the watch for this ObixClient. |