The platform layer provides portability across different operating systems.

All system calls (including networking) used in this SDK's libraries go through a lightweight platform layer. The functions of the platform layer are intended to be easily implementable on a wide variety of operating systems. The current platform layer has the following components:

Clock
Time-related functions used by libraries in this SDK.
Thread Management
Threading and synchronization functions used by libraries in this SDK.
Networking
Abstraction of network functions used by libraries in this SDK.
Metrics
Only used by Device Defender; does not need to be ported if not using Defender.
Functions for retrieving Device Defender metrics.
Atomics
Porting is optional, as a generic implementation is provided.
Atomic operations: small inlined functions used for atomically manipulating memory.

The following implementations are provided with this SDK as porting samples:

Component	Supported platforms
Clock	POSIX
Thread Management	POSIX
Networking	mbed TLS Berkeley sockets + OpenSSL + POSIX
Metrics	Sample implementation using the Networking abstraction. This implementation is not intended for production use.
Atomics	GNU compilers (gcc/clang) Generic implementation using a Thread Management mutex.