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\r\n" +
          "Content-Type: application/json;charset=utf-8\r\n" +
          "Host: " + host + ":" + httpPort + "\r\n" +
          "Content-Length: " + length + "\r\n" +
          "Connection: Keep Alive \r\n" +
          +"\r\n"
          +data
          +"\r\n";
      // Serial.println(postRequest);
       client.print(postRequest);

    delay(600);
    //处理返回信息
    String line = client.readStringUntil('\n');

    while (client.available() > 0) {
      line +='\n';
      line += client.readStringUntil('\n');

    }

    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：\r\n  电量统计： 98\r\n 空气质量： 89\r\n 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。