CycloneTCP Commercial License

For proprietary developments

CycloneTCP is available under 3 different commercial license categories for proprietary developments in a commercial context.

CycloneTCP Lite


CycloneTCP Lite includes all the core features of the IPv4 stack but does not provide any application protocols. This version targets developers who only need access to sockets and basic protocols (DHCP client, DNS and TFTP).

CycloneTCP Pro


CycloneTCP Pro is a full-featured TCP/IP stack (IPv4 support) that comes with a full set of application protocols like TFTP, FTP, HTTP, WebSocket, MQTT, MQTT-SN, CoAP, SMTP, SNTP, SNMP and Modbus/TCP.

CycloneTCP Ultimate


CycloneTCP Ultimate is a full-featured dual stack (IPv4 and/or IPv6 support). This version includes a full set of application protocols (TFTP, FTP, HTTP, WebSocket, MQTT, MQTT-SN, CoAP, SMTP, SNTP, SNMP, Modbus/TCP) and advanced protocols (IGMPv2 router & snooping switch, LLDP agent).

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Detailed feature breakdown
Choose the components that fit to your project!

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Commercial Software Packages | v2.4.0

PriceFrom €2,950
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Royalty free & Perpetual license (one-time fee)
Non-GPL license for commercial use with closed source software
Delivery & Service
Source code & Doxygen documentation
+ PDF user manual describing the core of the TCP/IP stack
12-month Support & Update Agreement (warranty, technical support, software updates, update notifications, migration guide, bug & security fixing, IP infringement protection)
IPv4 Stack & Basic Protocols
ARP, IPv4, ICMP, IGMPv2 host, IP fragmentation and reassembly, UDP, TCP, BSD sockets, Auto-IP, DHCP client, Host name resolution (DNS, mDNS, NetBIOS, LLMNR), VLAN (802.1q), TFTP client & server, PCAP driver to run the stack on Windows / Linux
Application Protocols
DNS-SD, DHCP server, FTP client & server, HTTP client (REST API) & server, SMTP client, SNTP client, SNMPv1 / SNMPv2c / SNMPv3 agent (MD5/SHA-1 authentication and DES/AES privacy protocols are included), WebSocket client & server, MQTT client, MQTT-SN client, CoAP client & server, Modbus/TCP client & server
IPv6 Stack & Advanced Protocols
IPv6, NDP, ICMPv6, MLDv1, SLAAC, DHCPv6 client & relay agent, IGMPv2 router & snooping switch, LLDP agent
Network Interface Drivers (on demand)
Ethernet MAC, Ethernet Switch, Wi-Fi, PPP (Point to Point Protocol), USB/RNDIS, PLC / G3-PLC, Ethernet over SPI
Secure Protocols available using our TLS/DTLS or SSH library
Secure Socket (TCP/UDP), FTPS client & server, HTTPS client & server, Secure SMTP client, Secure WebSocket client & server, Secure MQTT client (MQTTS), Secure MQTT-SN client, Secure CoAP client & server, Secure Modbus/TCP client & server

SSH client & server, SFTP client & server, SCP client & server
Optional Protocols
Spanning Tree Protocol (STP and RSTP)

HTTP/2 client
CycloneHTTP/2 Add-on(1)

(1) The HTTP/2 client is also available under ST Liberty Ultimate License for STM32 users. Refer to Alexa Voice Service software expansion for STM32Cube (X-CUBE-AVS).

Choose a Commercial License for:



If you develop proprietary commercial applications with closed source, use of a Commercial License is required.


Priority Support

You will have access to priority technical support with software maintenance for updates & security patches.



This license gives the right to develop and modify our software to embed it in your commercial products.


IP Protection

We guarantee that 100% of our commercial software packages have been developed in-house.


Custom Services

Our customers are entitled to fair pricing for custom connectivity related software development or expertise.



All our standard Commercial Licenses are royalty-free licenses (one-time license fee), making licensing easier.