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LIBRARIES
FreeRTOS+TCP is currently an IPv4 TCP/IP stack, but IPv6 functionality along with support for multiple network Interfaces is available as a FreeRTOS Labs project. The IPv6/Multi-interface version is fully functional but still undergoing optimization, test coverage and documentation improvements, and memory safety checks. Until that work is complete the code is available on a branch of the FreeRTOS+TCP GitHub repo separately from the main FreeRTOS downloads.

FreeRTOS+TCP
Open source and thread safe TCP/IP stack for FreeRTOS

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

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

See the FreeRTOS+TCP section in the tree menu (on the left) for a FreeRTOS+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+TCP and FreeRTOS+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_DHCP.c 1.9K 1.3K
FreeRTOS_DNS.c 3.5K 2.0K
FreeRTOS_Sockets.c 6.6K 4.9K
FreeRTOS_Stream_Buffer.c 0.3K 0.3K
FreeRTOS_IP.c 3.5K 2.6K
FreeRTOS_ARP.c 8.4K 1.2K
FreeRTOS_UDP_IP.c 0.7K 0.5K
FreeRTOS_TCP_IP.c 7.0K 4.8K
FreeRTOS_TCP_WIN.c 2.2K 1.7K
BufferAllocation_1.c 0.8K 0.8K
…worst case with everything enabled
(including some as yet undocumented features) 		34.9K 20.1K



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