Display events can originate from many different source types. Since the HNM may not know the form of those sources in advance, it exposes a plugin framework to allow new event sources to be added.
Plugins are DLLs (shared objects) that must register with the HNM subsystem via the hnm_register_module() function. Plugins are loaded via the policy.cfg file (see "Configuration" for details.)
| Plugin | Filename | Description |
|---|---|---|
| Generic | event-source-generic.so | Provides a generic PPS interface that allows applications to use the HNM policy-management facilities without implementing a custom plugin. This plugin can also be used for automated testing. |
| HandsFreePhone | event-source-handsfree.so | Generates display events to notify subscribing HMI applications so they can handle incoming handsfree phone calls. |
| VirtualMechanic | event-source-vm.so | Notifies the HNM of caution and alert conditions for relevant vehicle systems. |
The following sections in this chapter cover each of these plugins.