> ## Documentation Index
> Fetch the complete documentation index at: https://notevil.mintlify.site/llms.txt
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# CAPLfunctionTestWaitForMostApInstID

# TestWaitForMostApInstID

[Valid for](../../../Shared/FeatureAvailability.md): CANoe DE

## Function Syntax

```
long TestWaitForMostApInstID(unsigned long aTimeout);
```

## Description

The function waits for the specified period of time for a special change event of the application socket which is triggered when the InstanceId of an FBlock on its channel changes.

## Parameters

* **aTimeout**: Maximum time that should be waited \[ms]\
  (Transmission of 0: no timeout monitoring)

## Return Values

* **-2**: Resume based on Constraint Violation
* **-1**: General error e.g. the functionality is not available
* **0**: Resume based on Timeout
* **1**: Resume based on occurred event

## Example

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