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Document the 'androidtv.learn_sendevent' service (#13465)

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@ -265,6 +265,38 @@ You can also use the command `GET_PROPERTIES` to retrieve the properties used by
A list of various intents can be found [here](https://gist.github.com/mcfrojd/9e6875e1db5c089b1e3ddeb7dba0f304).
### `androidtv.learn_sendevent` (for faster ADB commands)
When sending commands like UP, DOWN, HOME, etc. via ADB, the device can be slow to respond. The problem isn't ADB, but rather the Android command `input` that is used to perform those actions. A faster way to send these commands is using the Android `sendevent` command. The challenge is that these commands are device-specific. To assist users in learning commands for their device, the Android TV integration provides the `androidtv.learn_sendevent` service. Its usage is as follows:
| Service data attribute | Optional | Description |
| ---------------------- | -------- | ----------- |
| `entity_id` | no | Name(s) of Android TV / Fire TV entities.
1. Call the `androidtv.learn_sendevent` service.
2. Within 8 seconds, hit a single button on your Android TV / Fire TV remote.
3. After 8 seconds, a persistent notification will appear that contains the equivalent command that can be sent via the `androidtv.adb_command` service. This command can also be found in the `adb_response` attribute of the media player in Home Assistant, and it will be logged at the INFO level.
As an example, a service call in a [script](/docs/scripts) could be changed from this:
```yaml
# Send the "UP" command (slow)
- service: androidtv.adb_command
data:
entity_id: media_player.fire_tv_living_room
command: UP
```
to this:
```yaml
# Send the "UP" command using `sendevent` (faster)
- service: androidtv.adb_command
data:
entity_id: media_player.fire_tv_living_room
command: "sendevent /dev/input/event4 4 4 786979 && sendevent /dev/input/event4 1 172 1 && sendevent /dev/input/event4 0 0 0 && sendevent /dev/input/event4 4 4 786979 && sendevent /dev/input/event4 1 172 0 && sendevent /dev/input/event4 0 0 0"
```
### `androidtv.download` and `androidtv.upload`
You can use the `androidtv.download` service to download a file from your Android TV / Fire TV device to your Home Assistant instance.