# Interval Timer Event Source

Trigger Flux app actions at regular intervals.

When you select **Interval Timer** as the [event source](https://docs.soracom.io/en/services/flux/channels-and-event-sources#create-a-channel-and-select-an-event-source) for the Flux App, the App will be triggered at regular intervals.

## Event Source Configuration

Set the conditions for when event messages should be published to the channel from the event source.

- **Enabled**: To send messages using the interval timer, set to `Enable`. If set to `Disable`, no message will be sent.
- **Schedule Expression**: Specify the time interval as an integer. The minimum interval is 1 minute.
- **Event Payload**: Sets the JSON object that is sent to the attached channel when the Scheduled Timer starts.
- **Description**: Enter a description of the Interval Timer.

## Data Format

The data sent to a channel configured with the Interval Timer event source consists of **Message** and **Context**.

> [!WARNING]
>
> You can check the data received by the event to the Flux App in the **History** tab of Soracom Flux Studio. For more details, refer to [View Logs](https://docs.soracom.io/en/services/flux/logs).

### Message

Message specified in the **Event Payload**, or `null` if not specified.

### Context

Data related to the Interval Timer. Here's an example:

```json
{
  "eventType": "schedule",
  "scheduleId": "0123456789ABCDEFGHIJKLMNOP",
  "timestamp": 1723203168131
}
```

The attributes are as follows:

| Attribute | Description |
| - | - |
| `eventType` | The type of event. When the Interval Timer triggers the Flux App, the value is `schedule`. |
| `scheduleId` | An ID assigned to each Interval Timer. |
| `timestamp` | The date and time when the Flux App execution was triggered by the Interval Timer event source (UNIX time in milliseconds). |

> [!WARNING]
>
> To reference the above **Context** in an action, input it as `${event.context.<CONTEXT_ATTRIBUTE>}` or `event.context.<CONTEXT_ATTRIBUTE> == 1`.