> 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/radio-time-observer.md).

# Radio Time Observer

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

## Radio Time

During simulation initialization, Skydel will ask for a `SkydelRuntimeRadioTimeObserver*` from every plug-in via the `createRuntimeRadioTimeObserver` method. It is mandatory to give full ownership of the returned pointer to Skydel.

During simulation, Skydel will send an estimate of the radio time at 1000 Hz via the `pushRadioTime` method with the following data structure. For more details on the usage of this information, see the [Time Synchronization](/skydel-plug-ins-documentation/plug-in-development/time-synchronization.md) section.

| RadioTimeEstimate  | Definition                                                | Unit                     |
| ------------------ | --------------------------------------------------------- | ------------------------ |
| radioElapsedTimeMs | Latest radio simulation estimated time                    | millisecond              |
| osTime             | Operating system time point of when the estimate was made | std::chrono::time\_point |

## Helper Functions

#### getDeadline(int64\_t elapsedMs, const RadioTimeEstimate& recentEstimate)

Returns an operating system `time_point` for when the RF corresponding to the given `elapsedMs`is expected to be broadcast from the radio.

This same deadline can be used in conjunction with the `DelayedBroadcaster` in the given example to broadcast a UDP packet at the same time as the RF.

#### microsecondsUntilRadioTransmission(int64\_t elapsedMs, const RadioTimeEstimate& recentEstimate)

Returns an integer number of microseconds until RF corresponding to the given `elapsedMs` is expected to be broadcast from the radio.

## Dynamic User Interface

Same as `SkydelPositionObsereverInterface`, see [Position Observer](/skydel-plug-ins-documentation/plug-in-development/roles/position-observer.md#dynamic-user-interface) of [Position Observer](/skydel-plug-ins-documentation/plug-in-development/roles/position-observer.md) for more details.

## Example

See the plug-in example [radio\_time\_observer\_plugin](https://github.com/learn-safran-navigation-timing/skydel-example-plugins/tree/master/source/radio_time_observer_plugin) for more information. It covers:

* Receiving the radio time data in real time
* Updating the user interface
* Synchronizing multiple types of real time data
* Synchronizing real time data with RF transmission


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