Source Code

CycloneTCP, CycloneSSL and CycloneCrypto Open are released as a single package. The lastest source archive can be obtained from this page. If you want to browse the source tree instead of downloading, the complete source code and documentation are also available online.


Download Latest Version 1.7.8 (GPLv2 License)
Browse Source Code and Documentation

Upgrade Notice

To migrate your existing code to version 1.7.8, please read carefully the following application notes:


CycloneTCP Migration Guide
CycloneSSL Migration Guide

Download Archive (GPLv2 License)

This section provides version history and release notes:


    VersionDateChanges
    1.7.8 May 31, 2017
    • Added support for CMSIS-RTOS2 FreeRTOS
    • TFTP client implementation
    • Added support for IP-neutral MIBs: IP-MIB (RFC 4293), TCP-MIB (RFC 4022) and UDP-MIB (RFC 4113)
    • Added support for IF-MIB (RFC 2863), SNMP-MIB (RFC 3418), SNMP-USM-MIB (RFC 3414)
    • SNMP Agent and companion MIBs fully comply with TAHI Phase-II conformance test suite
    • Added Ethernet driver for STM32H7xx
    • Support for DP83822 Ethernet PHY
    • Support for WINC1500 Wi-Fi controller
    • CycloneSSL supports ECC508A crypto element (ECC hardware accelerator + private key storage)
    • Added SHAKE128 and SHAKE256 XOF functions
    • Added Wi-Fi demo projects for SAMG55-Xplained-Pro board
    • Added demo projects for PIC32MX470 Curiosity and PIC32MZ EF Curiosity boards
    1.7.6 January 30, 2017
    • Added support for CMSIS-RTOS2 (RTX v5)
    • WebSocket server implementation (with SSL/TLS support)
    • CycloneSSL API can be used in non-blocking mode
    • Support for PSK (Pre-Shared Key) TLS cipher suites
    • Added Ethernet driver for NXP LPC1780 (Cortex-M3 core)
    • Added Ethernet driver for Xilinx Zynq-7000 (Cortex-A9 core)
    • Added driver for Realtek RTL8211 Ethernet PHY
    • Support for Ethernet switches (KSZ8873, KSZ8895 and LAN9303)
    • Support for Microchip IoT Ethernet Kit (PIC32MZ device)
    • Support for ST Nucleo-144 boards (Nucleo-F207ZG, Nucleo-F429ZI and Nucleo-F746ZG)
    • Support for STM32469I-EVAL and STM32F769I-EVAL evaluation boards
    1.7.4 September 12, 2016
    • MQTT client (supports TCP, SSL/TLS, WebSocket and secure WebSocket transport)
    • WebSocket client implementation (with SSL/TLS support)
    • TFTP server
    • Support for IPv6 over PPP (IPV6CP)
    • Added Ethernet driver for Freescale Kinetis KV65/KV66
    • Support for Rapid Commit option (DHCP and DHCPv6 clients)
    • Support for ChaCha20Poly1305 TLS cipher suites
    • ChaCha encryption algorithm
    • Poly1305 message-authentication code
    • Keccak sponge function
    • SHA-3 hash (SHA3-224, SHA3-256, SHA3-384 and SHA3-512)
    • New evaluation boards supported (TWR-K64F220M and FRDM-K66F)
    1.7.2 April 25, 2016
    • Secure FTPS client (with implicit and explicit security modes)
    • SNMP agent supports SNMPv3 (MD5/SHA-1 authentication and DES/AES privacy protocols available)
    • Full MIB-II implementation (system, interface, IP, ICMP, UDP, TCP and SNMP statistics)
    • NewReno is now used as default TCP congestion algorithm (as replacement of legacy Reno algorithm)
    • Added Wi-Fi driver for Atmel WILC1000/WINC1500 chips
    • Added Wi-Fi driver for Broadcom BCM43362 chip
    • Added Wi-Fi driver for Microchip MRF24WG0MA/B modules
    • Added Ethernet driver for Atmel SAMA5D2 (Cortex-A5)
    • Added Ethernet driver for Freescale Kinetis KV5x (Cortex-M7)
    • Added Ethernet driver for Infineon XMC4700 and XMC4800
    • Added Ethernet driver for Renesas Synergy S7
    • New Wi-Fi demo projects for WILC1000 (the WINC1500-Xplained-Pro extension boards can be used on either SAM4S-Xplained-Pro, SAME70-Xplained or SAMV71-Xplained-Ultra boards)
    • New Wi-Fi demo projects for MRF24WG (MRF24WG0MA PICTail Plus daughter board or WI-Fi G Eval board)
    • New Wi-Fi demo project for BCM43362 (Broadcom BCM493362WCD4-EVB evaluation board)
    • Fixed DHCP server (wrong management of DHCP options)
    • Fixed FTP server (invalid file size issue with STOR command)
    1.7.0 January 12, 2016
    • Added DHCP server
    • CycloneTCP complies with TAHI Phase-II conformance test suite (IPv6 hosts and routers)
    • mDNS/DNS-SD complies with BCT (Bonjour Conformance Test)
    • Changed thread model (the core of the TCP/IP stack now uses a single task)
    • Added Ethernet driver for TI Sitara AM335x (Gigabit Ethernet MAC)
    • Added Ethernet driver for OMAP-L138
    • Support for Atheros AR8031 Gigabit Ethernet PHY
    • Added PCAP driver to run the TCP/IP stack directly on Windows/Linux
    • Added demo projects for STM32756G-EVAL board
    • Added demo projects for BeagleBone Black and AM335x Starter Kit
    • Fixed invalid management of receive queue while closing UDP sockets
    • Fixed wrong management of identifier fields (CHAP)
    1.6.4 August 3, 2015
    • New callback functions for DHCP client (link change, DHCP state change, configuration timeout)
    • Added support for SNMP traps (SNMP agent)
    • PPP authentication (PAP and CHAP)
    • Support for Segger embOS
    • Support for SYS/BIOS (TI-RTOS)
    • The core of the TCP/IP stack allows RTOS-less operation
    • Added driver for Atmel SAM V71 microcontrollers (Cortex-M7 core)
    • Added driver for STM32F7 microcontrollers (Cortex-M7 core)
    • Added driver for Freescale Kinetis K70 microcontrollers
    • Added driver for Freescale Coldfire V2 microcontrollers (MCF5225x)
    • Added driver for LPC2378 microcontrollers
    • Added driver for Spansion FM4 microcontrollers
    • Added driver for STR9 microcontrollers
    • Added driver for TI Concerto DSPs (FM28M35x)
    • Support for new Ethernet PHYs (LAN8710, LAN8742, KSZ8061, KSZ8091)
    • Support for ENC28J60 Ethernet controller
    • New evaluation boards (STM32F746G-Discovery, SAMV71-Xplained-Ultra, TWR-K70F120M, SK-FM4-176L-S6E2CC-ETH, STR-E912, TMDXCNCDH52C1)
    1.6.0 January 26, 2015
    • Auto-IP (dynamic configuration of IPv4 link-local addresses)
    • DNS-SD (DNS-based service discovery)
    • PPP (Point-to-Point Protocol)
    • HTTP server now uses static resources
    • Support for KSZ8851 Ethernet controller (revision 3)
    • Support for Atmel SAMA4S-Xplained-Pro + Ethernet1-Xplained-Pro kit
    1.5.0 September 16, 2014
    • NetBIOS responder and NetBIOS host name resolution
    • SNMP agent (v1 and v2c versions are supported)
    • Added driver for Atmel SAMA5D3 (Cortex-A5 w/ Gigabit Ethernet MAC)
    • Added driver for Atmel AVR32 UC3A microcontrollers
    • Support for Micrel KSZ9031 Gigabit Ethernet PHY
    • New RTOS abstraction layer supporting FreeRTOS, ChibiOS, CMSIS-RTOS, Keil RTX and Micrium µC/OS-III
    • Added MP3 Internet radio demo for RSK+RZ/A1 board
    • Support for Atmel SAMA5D3-Xplained kit
    • Support for Atmel EVK1105 evaluation kit
    • Fast software AES implementation
    1.4.4 June 4, 2014
    • HTTP basic and digest authentication schemes
    • HTTP over SSL/TLS is now supported (HTTPs server)
    • Raw sockets can send/receive packets at Ethernet level
    • Added driver for Renesas RZ/A1 (Cortex-A9 MPU)
    • Added driver for Microchip PIC32MZ microcontrollers
    • Added driver for Freescale Kinetis K64 microcontrollers
    • Added driver for STM32F429 and STM32F439 microcontrollers
    • Added driver for ENC424J600 and ENC624J600 Ethernet controllers
    • Added driver for Micrel KSZ8851 Ethernet controllers
    • Support for Micrel KSZ8081 Ethernet PHY
    • Support for Renesas uPC60611 Ethernet PHY
    • Support for SMSC LAN8740 Ethernet PHY
    • New CooCox IDE examples for STM32F4-Discovery evaluation board
    • Support for Freescale FRDM-K64F evaluation board
    • New SSL and SMTP project examples for PIC32MX
    • Support for Microchip PIC32MZ EC starter kit
    • Support for STM32F4x9I-EVAL evaluation board
    • Support for Renesas RSK+RZ/A1 and ArchiTech Hachiko evaluation boards
    1.4.2 March 19, 2014
    • File system support (HTTP server)
    • User configurable home directory (FTP server)
    • Added driver for Microsemi (formerly Actel) SmartFusion
    • Added driver for Microsemi SmartFusion2
    • Support for Microsemi A2F-EVAL-KIT-2 evaluation board
    • Support for Microsemi SF2-STARTER-KIT-ES-2 evaluation board
    • Added SSL client and SSL server demo projects
    • Added support for Elliptic Curve Cryptography (ECC)
    1.4.1 January 16, 2014
    • Added SNTP client
    • Added mDNS client and responder
    • Improved DNS client (DNS cache, support for multiple DNS servers)
    • Added driver for Renesas RX63N
    • Added driver for TI Tiva C series (TM4C129X)
    • Support for Renesas YRDKRX63N evaluation board
    • Support for TI DK-TM4C129X evaluation board
    • Added IAR EWARM demo projects for STM32-based evaluation boards
    • Fixed interoperability issue between FTP server and Windows Explorer
    1.4.0 November 27, 2013
    • Added FTP server
    • Added driver for ST802RT1A Ethernet PHY transceiver
    • Support for Keil MCBSTM32F400 evaluation board
    • Added FTP server demo projects for STM32F4-DISCOVERY and MCBSTM32F400 evaluation boards
    • New RTOS abstraction layer
    • Socket buffer size can be configured dynamically
    • Customizable GPIO configuration for Ethernet MAC drivers
    1.3.8 October 7, 2013
    • Added driver for Atmel SAM4E microcontrollers
    • Added driver for Freescale Kinetis K60 microcontrollers
    • Added driver for Infineon XMC4500 microcontrollers
    • Added driver for Microchip PIC32MX microcontrollers
    • Added driver for NXP LPC1800 and LPC4300 series microcontrollers
    • Support for Micrel KSZ8031 and KSZ8041 Ethernet PHYs
    • Added demo projects for newly supported devices
    • Improved support for out-of-order TCP packets
    1.3.5 September 2, 2013
    • Support for Davicom DM9000 Ethernet controller
    • Added Web server demo project for SAM7SE-EK evaluation board
    • getHostByName function prototype has been extended
    1.3.4 August 12, 2013
    • Added driver for Atmel SAM3X microcontrollers
    • Added Keil MDK-ARM and Atmel Studio 6 demo projects from SAM3X-EK evaluation board
    1.3.3 August 5, 2013
    • Added driver for Stellaris LM3S6965 microcontrollers
    • Support for SMSC LAN8720 Ethernet PHY
    • Added FTP client demo project for EK-LM3S6965 evaluation board
    • Added HTTP client demo project for STM32F4-DISCOVERY board
    1.3.2 July 12, 2013
    • Added driver for Atmel SAM7X and SAM9263 microcontrollers
    • Added driver for NXP LPC1700 series Cortex-M3 microcontrollers
    • Added Keil MDK-ARM demo projects for each supported device
    1.3.1 June 17, 2013
    • CycloneSSL and CycloneCrypto are released as open source software
    • Added STM32F107 and STM32F407 drivers
    • Support for Davicom DM9161 Ethernet PHY
    • Support for Micrel KSZ8051 and KSZ8721 Ethernet PHYs
    • Fixed issue when reading TCP sockets in CLOSE-WAIT state
    • Added FTP client implementation
    1.2.4 February 24, 2013
    • CycloneTCP is made available as open source software