此软件包包括FreeModbus从栈协议和补充的主栈协议，采用的是RTU模式，主从协议栈与uC/OSIII进行的整合，并在STM32F407硬件平台上进行了移植，经过调试和测试，运行正常。

详细介绍了LWIP协议的移植，对程序结构和通信协议以及移植步骤进行了较为详细的说明。

Design and Implementation of the lwIP TCP/IP Stack lwip官方文档（英文），lwip移植优化必备 lwIP is an implementation of the TCP/IP protocol stack. The focus of the lwIP stack is to reduce memory usage and code size, making lwIP suitable for use in small clients with very limited resources such as embedded systems. In order to reduce processing and memory demands, lwIP uses a tailor made API that does not require any data copying. This report describes the design and implementation of lwIP. The algorithms and data struc- tures used both in the protocol implementations and in the sub systems such as the memory and bu®er management systems are described. Also included in this report is a reference manual for the lwIP API and some code examples of using lwIP.