# Overview

This document outlines guidelines for customers migrating TelSDK-based applications to the SA535M.LE.1.0 platform.

It outlines:

- APIs that have been removed
- APIs that are deprecated
- Recommended alternate APIs
- Updated initialization and service readiness patterns
- Migration examples to help transition from old APIs to new APIs

This document is intended for developers who have developed software using TelSDK on platforms prior to SA535M.LE.1.0, and are interested in porting those applications to the SA535M.LE.1.0 platform.

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## What is deprecation?

Deprecation is a mechanism used to indicate that an API is no longer the preferred way to implement functionality and may be removed in future releases.

Example:

Consider an API `makeECall()` introduced in SA415 for handling regular eCalls. In SA515, a newer API `makeECallEx()` is introduced that supports both regular eCalls and TPS eCalls. With the introduction of the newer API, the original `makeECall()` API is marked as deprecated.

As software evolves—through refactoring, feature enhancements, or architectural improvements—new APIs may provide improved functionality or usability. In such cases:

- Existing APIs are marked as deprecated in header files and documentation
- Deprecated APIs continue to exist and function as before, ensuring backward compatibility. But they could be removed in future platforms.
- Customers are advised to migrate to the newer alternate APIs

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## What does removal of deprecated APIs mean in SA535M?

APIs that were marked as deprecated in earlier releases have been removed in SA535M.

As a result:

- Software developed on SA515M or prior chipsets that still use these deprecated APIs will encounter compilation failures when ported to SA535M
- Such software must be updated to use the corresponding alternate APIs

The alternate APIs are designed to maintain similar semantics and behavior, ensuring that migration effort remains straightforward for customers.

Last Published: Aug 11, 2026

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