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声明
本文实现了ESP8266、微信小程序、个人服务器三者互相通信，并且小程序能发消息给微信用户
本文所有代码和步骤均为亲测有效
以下代码均为从网上搜索到后本人加以改动的，并非完全原创，若作者希望删除可联系我
ESP8266与个人服务器通信
ESP8266配置
通过串口通信使用AT指令控制ESP8266，AT指令详细讲解网上很多，自行搜索
复位：
AT+RST\r\n连接wifi：
AT+CWJAP="601_2.4G","tddsqdhgq15"\r\n检查ip：
AT+CIFSR\r\n链接个人服务器，x.x.x.x为个人服务器的公网IP地址，y为个人服务器开放的通信端口：
AT+CIPSTART="TCP","x.x.x.x",y\r\nESP8266向个人服务器发送15个字符：
AT+CIPSEND=15\r\n个人服务器配置
建立tcp_server.cpp文件。
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <linux/tcp.h>#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/shm.h>#include <pthread.h>#define PORT 8888
#define QUEUE_SIZE 10
#define BUFFER_SIZE 1024#define CHECK_ERROR(sts, status) {if (sts) {printf("CHECK_ERROR:%d %d %d\n%s\n", __FILE__, __FUNCTION__, __LINE__);return status;}}int total_device_num = 0;struct DEVICE_T
{int sockfd;int id;pthread_t tid;char reserved[16];
};DEVICE_T device_t[1000];//传进来的sockfd，就是互相建立好连接之后的socket文件描述符
//通过这个sockfd，可以完成 [服务器]<--->[8266] 互相收发数据void *strPrintf(void *args)
{int sockfd = *((int *)args);char buffer[BUFFER_SIZE];char device_id_string[10];memset(device_id_string, 0, 10);pid_t pid = pthread_self();unsigned int i = 10, j = 0;while(1){memset(buffer,0,sizeof(buffer));//printf("listening sockfd %d\n", sockfd);int len = recv(sockfd, buffer, sizeof(buffer),0);if(strcmp(buffer,"exit\n")==0){printf("child process: %d exited.\n",pid);break;}printf("sockfd:%d receive:%s\n",sockfd,buffer);if ( buffer[0] == 'd' ){for(i = 10; buffer[i] != '_'; i ++)//device_id_123_{if (i > 19){printf("error:i > 24\n");exit(0);}device_id_string[i - 10] = buffer[i];}printf("sockfd:%d id %d\n", sockfd,atoi(device_id_string));for (i = 0; i < total_device_num; i ++){if (sockfd == device_t[i].sockfd){break;}}device_t[i].id = atoi(device_id_string);printf("\n\n\n\n↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓ 发生设备绑定 ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓\n");printf("此设备：编号 %d id %d sockfd %d\n", i, device_t[i].id, device_t[i].sockfd);printf("已经连接的设备总数: %d\n", total_device_num);printf("所有设备信息如下：\n");for (j = 0; j < total_device_num; j ++){printf("device[%d] id %d sockfd %d tid %d\n", j, device_t[j].id, device_t[j].sockfd, device_t[j].tid);}printf("↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑\n\n\n\n");}// fputs(buffer, stdout);struct tcp_info info;int len_tcp_info = sizeof(info);getsockopt(sockfd, IPPROTO_TCP, TCP_INFO, &info, (socklen_t*)&len_tcp_info);int sts_getsockopt = getsockopt(sockfd, IPPROTO_TCP, TCP_INFO, &info, (socklen_t*)&len_tcp_info);printf("设备：编号 %d id %d socket %d tcp状态 %d getsockopt返回值 %d\n", i, device_t[i].id, device_t[i].sockfd, info.tcpi_state, sts_getsockopt);if((info.tcpi_state != 1)|| (sts_getsockopt != 0)) //则说明未断开 else 断开{printf("已经断开链接！！\n");if (total_device_num == 1){device_t[0].id = 0;device_t[0].sockfd = 0;device_t[0].tid = 0;}else{device_t[i].id = device_t[total_device_num - 1].id;device_t[i].sockfd = device_t[total_device_num - 1].sockfd;device_t[i].tid = device_t[total_device_num - 1].tid;device_t[total_device_num - 1].id = 0;device_t[total_device_num - 1].sockfd = 0;device_t[total_device_num - 1].tid = 0;}total_device_num --;close(sockfd);pthread_exit((void **)"线程关闭\n");}else{printf("发送消息：%s\n", buffer);send(sockfd, buffer, len, 0); //将接收到数据发送回去}}close(sockfd);
}int main(int argc, char **argv)
{int err,i ;pthread_t ntid;//建立本cpp与php之间的通信，此线程一直保存err = pthread_create(&ntid, NULL, PHP_and_TcpServer, NULL);if (err != 0)printf("can't create thread: %d\n", err);//定义IPV4的TCP连接的套接字描述符int server_sockfd = socket(AF_INET,SOCK_STREAM, 0);//定义sockaddr_in