# fsPlannedRouteRegisterForRequest<no value>
Registers a callback for route request from the {{< glossterm >}}efb{{< /glossterm >}}. This is triggered when the player clicks the "Sync Route From Avionics" button.

 

##### Syntax

``` wasm
bool fsPlannedRouteRegisterForRequest(
  fsPlannedRouteRequestCallback callback,
  void* ctx
)
```

 

##### Parameters

{{< table-wrapper >}}

| Parameter  | Description                                                         | Type     |
|------------|---------------------------------------------------------------------|----------|
| `callback` | The callback to call when a route request is received from the EFB. | Callback |
| `ctx`      | A user data pointer that will be sent with the callback.            | Pointer  |

{{< /table-wrapper >}}


 

##### Return Values

The function will return a bool indicating if the call was successful.

  

##### Remarks

Modules which have registered callbacks via this function will receive route request IDs when the player requests a route from avionics to be synchronized to the EFB. Responses should be made with the `fsPlannedRouteRespondToRequest` function.

 

Only one response should be made to any given request. If multiple responses are made, undefined behavior may occur on the EFB.