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 the
platform, 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 (
true) and disables (false) the use of the watch for this ObixClient.
|