> For the complete documentation index, see [llms.txt](https://skydel.gitbook.io/skydel-plug-ins-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://skydel.gitbook.io/skydel-plug-ins-documentation/plug-in-development/roles/simulator-state-observer.md).

# Simulator State Observer

This section contains a description of the SkydelSimulatorStateObserverInterface supported by Skydel.

## Simulator State

The `SkydelSimulatorStateObserverInterface` interface can be used to obtain information about the current state of the simulator. By implementing the `pushSimulatorState` method, a plug-in can act upon changes to the simulator's state. The method exposes the main state and sub state (`simulatorState` and `simulatorSubState`) that is sent by the simulator:

<table data-full-width="false"><thead><tr><th width="141">Main State</th><th width="221">Sub State</th><th>Description</th></tr></thead><tbody><tr><td>Idle</td><td>Incomplete</td><td>The configuration is invalid and the simulator cannot be started</td></tr><tr><td>Idle</td><td>Ready</td><td>The simulator is ready to be started</td></tr><tr><td>Started</td><td>Initializing Plug-ins</td><td>Plugin-initialization where the <em>initialize</em> method of the SkydelCoreInterface is called</td></tr><tr><td>Started</td><td>Initializing</td><td>The simulator is preparing the output for streaming</td></tr><tr><td>Started</td><td>Armed</td><td>The simulator's hardware is initialized and ready to start</td></tr><tr><td>Started</td><td>Streaming RF</td><td>The simulator is running</td></tr><tr><td>Started</td><td>WF Init (Worker instance)</td><td>In Wavefront context, a worker instance is synchronizing with the main instance</td></tr><tr><td>Started</td><td>WF Init (Main instance)</td><td>In Wavefront context, the main instance is synchronizing its worker instances</td></tr><tr><td>Started</td><td>WF Sync PPS Reset</td><td>In Wavefront context, the main instance communicates a reference PPS to the worker instances</td></tr><tr><td>Started</td><td>WF Sync Start</td><td>In Wavefront context, the main instance is using the PPS IN Delay Preference to determine when the GNSS RF signal should start streaming</td></tr><tr><td>Started</td><td>HIL Sync</td><td>In HIL context, the simulator is waiting for positions to start </td></tr><tr><td>Started</td><td>Sync Init</td><td>In Main/Worker multi-instance context, the main instance waits for all worker instances to finish initializing</td></tr><tr><td>Started</td><td>Sync Worker instance</td><td>In Main/Worker multi-instance context, the worker instance is waiting to start streaming on the PPS selected by the main instance</td></tr><tr><td>Started</td><td>Sync PPS Reset</td><td>In Main/Worker multi-instance context, the main instance communicates a reference PPS to the worker instances</td></tr><tr><td>Started</td><td>Sync Start Time</td><td>In Main/Worker multi-instance context when using GPS Timing receiver, the main instance retrieves the GPS time from the receiver and sets the simulation start time</td></tr><tr><td>Started</td><td>Sync Start</td><td>In Main/Worker multi-instance context, the main instance is using the PPS IN Delay Preference to determine when the GNSS RF signal should start streaming</td></tr><tr><td>Error</td><td>Error</td><td>The simulator encountered an error and stopped</td></tr></tbody></table>


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