lwip接收文件 stm32_LwIP+ STM32+HTTP例程参考

发表于 2023-1-15 19:23

#include



#include



#include



#include



#include



// Http请求内容



static const char send_data[] =



"GET /v1.0/device/1949/sensor/2511/datapoints HTTP/1.1\r\n"



"U-ApiKey:[your apikey]\r\n"



"Host: api.yeelink.net\r\n\r\n";



void tcpclient(const char* host_name, int port)



{



(void)port;



char *recv_data;



int sock, bytes_received;



struct hostent *yeelink_host;



struct in_addr yeelink_ipaddr;



struct sockaddr_in yeelink_sockaddr;



recv_data = rt_malloc(1024);



if (recv_data == RT_NULL)



{



rt_kprintf("No memory\r\n");



return;



}

发表于 2023-1-15 19:24

复制

// 第一步 DNS地址解析



rt_kprintf("calling gethostbyname with: %s\r\n", host_name);



yeelink_host = gethostbyname(host_name);



yeelink_ipaddr.s_addr = *(unsigned long *) yeelink_host->h_addr_list[0];



rt_kprintf("Yeelink IP Address:%s\r\n" , inet_ntoa(yeelink_ipaddr));



yeelink_sockaddr.sin_family = AF_INET;



yeelink_sockaddr.sin_port = htons(80);



yeelink_sockaddr.sin_addr = yeelink_ipaddr;



rt_memset(&(yeelink_sockaddr.sin_zero), 0, sizeof(yeelink_sockaddr.sin_zero));



while(1)



{

发表于 2023-1-15 19:26

复制

// 第二步 创建套接字



if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)



{



rt_kprintf("Socket error\n");



rt_free(recv_data);



return;



}

发表于 2023-1-15 19:27

复制

// 第三步 连接yeelink



if (connect(sock, (struct sockaddr *)&yeelink_sockaddr, sizeof(struct sockaddr)) == -1)



{



rt_kprintf("Connect fail!\n");



lwip_close(sock);



rt_free(recv_data);



return;



}

发表于 2023-1-15 19:27

// 第4步发送Http请求

send(sock,send_data,strlen(send_data), 0);

// 第5步获得Http响应

bytes_received = recv(sock, recv_data, 1024 - 1, 0);

recv_data[bytes_received] = '\0';

// 响应内容为 {"timestamp":"2013-11-19T08:50:11","value":1}

// 截取“value”之后的内容

char* actuator_info = rt_strstr( recv_data , "\"value\"");

int offset = rt_strlen("\"value\":");

actuator_status = *(actuator_info + offset);

rt_kprintf("actuator status :%c\r\n",actuator_status);

// 获得开关状态，并设置LED指示灯

char actuator_status;

(actuator_status == '1')?rt_hw_led_on(0):rt_hw_led_off(0);

rt_memset(recv_data , 0 , sizeof(recv_data));

// 关闭套接字

closesocket(sock);

// 延时5S之后重新连接

rt_thread_delay( RT_TICK_PER_SECOND * 5 );

}

}
作者：Lolwuj

来源：CSDN

原文：https://blog.csdn.net/mikewu_helloworld/article/details/52769650

版权声明：本文为博主原创文章，转载请附上博文链接！

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