这是公司实际项目工程（编译器用MDK5），STM32F4x7+freertos+lwip+ssl+MQTT，其中MQTT自己花了一个礼拜移植，可以同时发布消息和订阅消息，经过长期测试MQTT运行稳定。此外还移植了pollarSSL(TSL,AES,DES,RAS等等算法都经过项目测试，没有问题)，另外LWIP网络部分也运行稳定，支持随时插拔网线，最后公司所有运行信息可用printf从串口1输出。公司产品用的是STM32F407，LAN芯片为8720A,cpu外接8M晶振，所有下载到你的开发板上时候注意修改晶振。(This is a company's actual project project (compiler MDK5), STM32F4x7+freertos+lwip+ssl+MQTT, where MQTT spent a week in transplantation, and can publish messages and subscr iption messages at the same time. After long-term testing, MQTT runs steadily. In addition, pollarSSL (TSL, AES, DES, RAS and so on) have been tested by the project. There is no problem. In addition, the LWIP network part is also running stably, supporting the insertion and withdrawal of the network cable at any time. Finally, all the running information of the company can be output from printf by serial port 1. The company's products use STM32F407, LAN chip for 8720A, CPU external 8M crystal oscillator, all downloaded to your development board, pay attention to the modification of the crystal oscillator.)