微信硬件平台（八） 4 ESP8266通过微信公众号给用户推送消息

https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=自己申请微信公众号的TOKEN

输出结果：  由于aRDUINO串口不支持打印中文所以乱码，但是微信端接受正常。

 

代码实现：

#include <ESP8266WiFi.h>


#define WEIXIN_TOKEN  "19_qLywZOTSRQsE3NhNthVSL-MCFtpgC26QZZlard0yjaXAxW3G3TtNCnoTneMQrQtK-CcpjsruX084iVuLFBsuVRmJJgYKCSlJhcASOH5To_dHPe7jPj30HpGBIif22Pn3be77Hu8Z56KVs8LTOREbAIAYBO"
#define PRODUCT_TYPE "gh_e93c1b3098b9"
#define PRODUCT_ID   "gh_e93c1b3098b9_dae1c2072212185c"
#define host         "api.weixin.qq.com"
#define  httpPort     80
#define ssid      "HUAWEI-H3VBKZ"
#define password  "13991320168"
 
void setup() {
  Serial.begin(115200);
  delay(10);
 
  // We start by connecting to a WiFi network
 
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
 
  WiFi.begin(ssid, password); //works!
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
 
  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}



  
/*
输入：
String UESRID    微信用户ID
String CONTENT   要发送的内容
输出：           无
*/
void SendMsgToUser(String UESRID,String CONTENT){

    
    String data =(String) "{"    
   + " "touser":""+UESRID+""," 
   + " "msgtype":"text","  
   +  ""text" :"  
   +  "{ "content":""+CONTENT+"", }"   
   + "}"  ;

  Serial.println("/**************************************************/");
  Serial.print("connecting to ");
  Serial.println(host);
 
  // Use WiFiClient class to create TCP connections
  WiFiClient client;

  if (!client.connect(host, httpPort)) { //works!
    Serial.println("connection failed");
    return;
  }
 
  // We now create a URI for the request
  String url = "/cgi-bin/message/custom/send";
  url += "?access_token=";
  url += WEIXIN_TOKEN;

      int length = data.length();
      
      String postRequest =(String)("POST ") + url + " HTTP/1.1
" +
          "Content-Type: application/json;charset=utf-8
" +
          "Host: " + host + ":" + httpPort + "
" +          
          "Content-Length: " + length + "
" +
          "Connection: Keep Alive 
" +
          +"
"
          +data
          +"
";
      // Serial.println(postRequest);
       client.print(postRequest);

    delay(600);
    //处理返回信息
    String line = client.readStringUntil('
');
  
    while (client.available() > 0) {
      line +='
';
      line += client.readStringUntil('
');
     
    }
    
    Serial.println(line);
    client.stop();

    
  Serial.println();
  Serial.println("closing connection!");
  
  
  }

  int msgnum=0;
void loop() {



  if(msgnum<100){
  msgnum++;}
  else { msgnum=0;  }
  
  delay(10000);

  String UESRID="ognVI6JsmBGd7lxYTZY4GH29LcNg";
  String CONTENT=(String)"这是来自ESP8266发送的第"+msgnum+"条消息：
  电量统计： 98
 空气质量： 89
 连接地址：<a href=http://www.qq.com >！";

  SendMsgToUser(UESRID,CONTENT);
}

　　

遇到问题：

问题一：

一定时间内，有推送消息限制。20条。如果推送了20条用户没有给公众号发送消息或者互动（点击菜单什么的），微信服务器停止推送消息。

所以每当我从公众号接受20条消息，就要手动给公众号回复消息。

问题二：

1. {
2.  
   "errcode":45015,
3.  
   "errmsg":"response out of time limit or subscription is canceled hint: [ZE1Uxa0498age8]"
4.  
   }

    

    

    原因是当用户微信不活跃时间超过24小时（此时间当前是多少由腾讯定），不会将信息推送到用户微信公众号。