Porting a TCP/IP stack - FreeRTOS

Porting a TCP/IP stack

FreeRTOS provides a TCP/IP stack for boards that do not have on-chip TCP/IP functionality. If your platform offloads TCP/IP functionality to a separate network processor or module, you can skip this porting section and start Porting the Secure Sockets library.

FreeRTOS+TCP is a native TCP/IP stack for the FreeRTOS kernel. FreeRTOS+TCP is maintained by the FreeRTOS engineering team and is the recommended TCP/IP stack to use with FreeRTOS. For more information, see Porting FreeRTOS+TCP.

The lightweight IP (lwIP) TCP/IP stack is an open source third-party TCP/IP stack, ported to the FreeRTOS kernel. The lwIP port layer currently supports lwIP version 2.03. For more information, see Porting lwIP.


These porting sections only provide instructions for porting to a platform's Ethernet or Wi-Fi driver. The tests only ensure that the Ethernet or Wi-Fi driver can connect to a network. You cannot test sending and receiving data across a network until you have ported the Secure Sockets library.

A Secure Sockets library implementation already exists for the FreeRTOS+TCP TCP/IP stack and the lwIP stack. If you are using FreeRTOS+TCP or lwIP, you do not need to port the Secure Sockets library. After you finish porting the FreeRTOS+TCP stack or the lwIP stack to your device, you can start Porting the PKCS #11 library. Even if you do not need to create a port for the Secure Sockets library, your platform still needs to pass the AWS IoT Device Tester tests for the Secure Sockets library for qualification.