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WHAT'S NEW
Achieving Unbrickable MCU FOTA for your FreeRTOS-powered Firmware:
The Microvisor IoT Approach. See the blog post.
FreeRTOS 202012 LTS end of support announced.
You can migrate your project to FreeRTOS 202210.01 LTS or subscribe to the FreeRTOS Extended Maintenance Plan. See the blog post.
FreeRTOS website now available in Simplified Chinese
Search and browse content in your preferred language. See the blog post.
New FreeRTOS Long Term Support version now available.
Receive security patches and critical bug fixes on FreeRTOS libraries for two years. See the blog post.
FreeRTOS Extended Maintenance Program (EMP) registration now open.
Providing security patches and critical bug fixes on FreeRTOS Long Term Support (LTS) versions for up to 10 additional years. See the blog post.
See also the FreeRTOS Labs project that adds IPv6, as well as multiple network interface and multiple endpoint support to current release version of FreeRTOS-Plus-TCP.

FreeRTOS-Plus-TCP v3.0.0 improves the robustness, security, and modularity of the FreeRTOS-Plus-TCP library. Learn more here.

FreeRTOS-Plus-TCP
Open source and thread safe TCP/IP stack for FreeRTOS

FreeRTOS-Plus-TCP is a scalable, open source and thread safe TCP/IP stack for FreeRTOS.

FreeRTOS-Plus-TCP provides a familiar and standards based Berkeley sockets interface, making it as simple to use and as quick to learn as possible. An alternative callback interface is also available for advanced users.

FreeRTOS-Plus-TCP's features and RAM footprint are fully scalable, making FreeRTOS-Plus-TCP equally applicable to smaller lower throughput microcontrollers as larger higher throughput microprocessors.

See the FreeRTOS-Plus-TCP section in the tree menu (on the left) for a FreeRTOS-Plus-TCP networking tutorial, porting guide, API documentation, and a link to the free TCP/IP source code download.

RTOS, TCP, FAT
Filezilla FTP'ing large and small files to a
66MHz MCU running FreeRTOS-Plus-TCP and FreeRTOS-Plus-FAT


Features
Berkeley sockets API
Optionally supports TCP sliding windows
Fully re-entrant and thread safe API
Includes ARP, DHCP, DNS, LLMNR, NBNS
Gratuitous ARPs
Static, DHCP and Auto-IP address assignment
Can also be used as a UDP only stack
Optionally callback interface
Optionally fragment outgoing packets
Berkeley Sockets API
FreeRTOS_socket()
FreeRTOS_setsockopt()
FreeRTOS_bind()
FreeRTOS_listen()
FreeRTOS_connect()
FreeRTOS_accept()
FreeRTOS_send() / FreeRTOS_sendto()
FreeRTOS_recv() / FreeRTOS_recvfrom()
etc.


Code Size (example generated with GCC for ARM Cortex-M)
File With -O1 Optimisation With -Os Optimisation
FreeRTOS_ARP.c 1.6K 1.4K
FreeRTOS_DHCP.c 1.9K 1.6K
FreeRTOS_DNS.c 0.4K 0.4K
FreeRTOS_DNS_Cache.c 0.7K 0.6K
FreeRTOS_DNS_Callback.c 0.4K 0.3K
FreeRTOS_DNS_Networking.c 0.2K 0.2K
FreeRTOS_DNS_Parser.c 0.7K 0.5K
FreeRTOS_ICMP.c 0.2K 0.2K
FreeRTOS_IP.c 4.3K 4.0K
FreeRTOS_IP_Timers.c 0.6K 0.6K
FreeRTOS_IP_Utils.c 1.7K 1.5K
FreeRTOS_Sockets.c 6.5K 5.3K
FreeRTOS_Stream_Buffer.c 0.5K 0.4K
FreeRTOS_TCP_IP.c 1.5K 1.1K
FreeRTOS_TCP_Reception.c 0.8K 0.6K
FreeRTOS_State_Handling.c 2.1K 1.7K
FreeRTOS_Transmission.c 2.1K 1.9K
FreeRTOS_TCP_Utils.c 0.2K 0.2K
FreeRTOS_TCP_WIN.c 2.1K 1.9K
FreeRTOS_Tiny_TCP.c 0.0K 0.0K
FreeRTOS_UDP_IP.c 0.5K 0.4K
Total estimates 28.8K 24.8K


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