# App — Listen

The LiSA Player dispatches a **Listen** message upon initialization to indicate its readiness for communication with the host app or environment.

The host app or environment must wait for the **Listen** message before sending any messages to the LiSA Player. Otherwise, the player may not receive them.

This message is sent by the LiSA Player to the host app / environment.

### Properties

Along with all standard [Message properties](/developers/guides/player-communication/message-api-reference.md#properties), a **Listen** message includes the following additional properties:

<table><thead><tr><th width="239" valign="top">Name</th><th width="162" valign="top">Type</th><th valign="top">Description</th></tr></thead><tbody><tr><td valign="top"><code>messageType</code></td><td valign="top"><pre><code>Literal
</code></pre><p>Required.</p></td><td valign="top"><code>lsc:app:listen</code></td></tr></tbody></table>

#### Legacy Properties

{% hint style="warning" %}
If your integration uses **LiSA Player Version 1**, none of the properties described above will be available.

For **LiSA Player Version 2**, legacy properties can be ignored.
{% endhint %}

<table><thead><tr><th width="239" valign="top">Name</th><th width="162" valign="top">Type</th><th valign="top">Description</th></tr></thead><tbody><tr><td valign="top"><code>action</code></td><td valign="top"><pre><code>Literal
</code></pre><p>Required.</p></td><td valign="top"><code>ready</code><br><br><span data-gb-custom-inline data-tag="emoji" data-code="26a0">⚠️</span> Please use <code>messageType</code> instead.</td></tr><tr><td valign="top"><code>target</code></td><td valign="top"><pre><code>Literal
</code></pre><p>Required.</p></td><td valign="top"><code>app</code><br><br><span data-gb-custom-inline data-tag="emoji" data-code="26a0">⚠️</span> Please use <code>messageType</code> instead.</td></tr></tbody></table>

***

### Type Definition

```typescript
interface AppListenMessage extends Omit<
  Message,
  'messageType' | 'sender'
> {
  messageType: 'lsc:app:listen';
  sender: 'LiSA';
}
```

***

### Examples

```json
{
  "clockDriftInMs": 0,
  "messageType": "lsc:app:listen",
  "sender": "LiSA",
  
  "action": "ready",
  "target": "app"
}
```


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