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
Atomic operations: small inlined functions used for atomically manipulating memory.

Currently, implementations exist for the following platforms:

Component	Supported platforms
Clock	FreeRTOS Software Timers
Thread Management	FreeRTOS Semaphores + FreeRTOS Tasks
Networking	Berkeley sockets
Metrics	Sample implementation using Berkeley sockets. This implementation is not intended for production use.
Atomics	FreeRTOS Kernel Control