Do you use lwIP today and want a more deterministic networking stack for embedded, real-time, or safety-critical systems? We just published a new developer guide: **Migrating from lwIP to wolfIP**.
wolfIP is designed around a simple idea: connected embedded systems should keep networking resources under control. Instead of relying on dynamic allocation and runtime growth, wolfIP uses compile-time configured resources, static buffers, and a fixed number of sockets per type. This makes it easier to reason about memory usage, bound system behavior, and build confidence in constrained or certification-oriented environments.
For teams building connected devices, that matters. Networking is no longer optional, but uncontrolled networking memory behavior can make bring-up, testing, verification, and long-term maintenance harder than it needs to be. wolfIP gives developers a smaller, more predictable TCP/IP stack that pairs naturally with wolfSSL for secure connectivity.
The new guide walks through the practical migration path from lwIP to wolfIP, including:
- the design differences between lwIP and wolfIP;
- simplifying configuration from `lwipopts.h` to wolfIP `config.h`;
- wiring a random-number source into wolfIP;
- porting existing lwIP network device drivers to wolfIP
- bare-metal socket usage with wolfIP APIs;
- translating simple TCP servers from lwIP raw/classic APIs;
- translating simple TCP servers from lwIP ALTCP-style interfaces;
- RTOS integration guidance;
- how to port wolfIP to a new OS using the FreeRTOS BSD-socket wrapper model;
- semaphore, task, callback, and polling integration patterns.
The guide is available in the wolfIP GitHub repository under: `docs/migrating_from_lwIP.md`
If you are evaluating wolfIP for an embedded product, safety-critical design, RTOS integration, or a migration away from lwIP, this guide is a good starting point.
wolfSSL offers commercial licensing, engineering services, and professional support options up to 24/7 for teams that need help with porting, integration, certification-oriented development, or production deployment.
If you have questions about any of the above, please contact us at facts@wolfssl.com or call us at +1 425 245 8247.
Download wolfSSL Now