ESP8266-Arduino网络编程实例-HTTP提交数据（基于Node-Red）

HTTP提交数据

本文将介绍ESP8266的HTTP POST请求：URL编码、JSON对象或纯文本。本实例的HTTP服务器仍基于Node-Red，在发起HTTP请求之前，在Node-Red中创建一个HTTP请求节点。如下所示：

在这里插入图片描述

在函数模块中，添加如下代码：

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msg.payload = msg.payload.temperature;
return msg;

整个节点JSON代码如下：

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[
    {
        "id": "7f5cf345.63f56c",
        "type": "http response",
        "z": "65febd16d6c14bb0",
        "name": "",
        "statusCode": "200",
        "headers": {},
        "x": 640,
        "y": 380,
        "wires": []
    },
    {
        "id": "e71c7a7d.e7c598",
        "type": "debug",
        "z": "65febd16d6c14bb0",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "x": 650,
        "y": 460,
        "wires": []
    },
    {
        "id": "c7807102.3f433",
        "type": "http in",
        "z": "65febd16d6c14bb0",
        "name": "",
        "url": "/update-sensor",
        "method": "get",
        "upload": false,
        "swaggerDoc": "",
        "x": 290,
        "y": 420,
        "wires": [
            [
                "60410cde.562a34"
            ]
        ]
    },
    {
        "id": "60410cde.562a34",
        "type": "function",
        "z": "65febd16d6c14bb0",
        "name": "",
        "func": "msg.payload = msg.payload.temperature;\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 490,
        "y": 420,
        "wires": [
            [
                "e71c7a7d.e7c598",
                "7f5cf345.63f56c"
            ]
        ]
    }
]

最后，部署流程就可以发起HTTP请求了。接着，完成ESP8266的HTTP POST请求代码：

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#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>

const char\* ssid = "\*\*\*\*"; // WIFI名称
const char\* password = "\*\*\*\*"; // WIFI密码

// HTTP请求URL
const char\* serverName = "你的Node-Red服务器地址/update-sensor";

unsigned long lastTime = 0;
unsigned long timerDelay = 5000;

void setup() {
  Serial.begin(115200);

  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
 
  Serial.println("Timer set to 5 seconds (timerDelay variable), it will take 5 seconds before publishing the first reading.");
}

void loop() {
  //Send an HTTP POST request every 10 minutes 
  if ((millis() - lastTime) > timerDelay) {
    // 检查WiFi状态
    if(WiFi.status()== WL_CONNECTED){
      WiFiClient client;
      HTTPClient http;
      
      // 启动HTTP请求
      http.begin(client, serverName);

      // 设置HTTP请求头
      http.addHeader("Content-Type", "application/x-www-form-urlencoded");
      // 所要提交数据
      String httpRequestData = "api\_key=tPmAT5Ab3j7F9&sensor=BME280&value1=24.25&value2=49.54&value3=1005.14";           
      // 发起HTTP POST请求
      int httpResponseCode = http.POST(httpRequestData);
      
      // JSON数据提交
      //http.addHeader("Content-Type", "application/json");
      //int httpResponseCode = http.POST("{\"api\_key\":\"tPmAT5Ab3j7F9\",\"sensor\":\"BME280\",\"value1\":\"24.25\",\"value2\":\"49.54\",\"value3\":\"1005.14\"}");

      // 纯文本数据提交
      //http.addHeader("Content-Type", "text/plain");
      //int httpResponseCode = http.POST("Hello, World!");
     
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
        
      // 释放HTTP
      http.end();
    }
    else {
      Serial.println("WiFi Disconnected");
    }
    lastTime = millis();
  }
}

在示例代码中，首先导入依赖头文件：

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#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>

const char\* ssid = "\*\*\*\*"; // WIFI名称
const char\* password = "\*\*\*\*"; // WIFI密码

// HTTP请求URL
const char\* serverName = "你的Node-Red服务器地址/update-sensor";

unsigned long lastTime = 0;
unsigned long timerDelay = 5000;

接着，在setup函数中初始化WiFi：

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WiFi.begin(ssid, password);
Serial.println("Connecting");
while(WiFi.status() != WL_CONNECTED) {
  delay(500);
  Serial.print(".");
}

最后，在loop函数，发起HTTP的POST请求：

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HTTPClient http;
     
     // 启动HTTP请求
     http.begin(client, serverName);

     // 设置HTTP请求头
     http.addHeader("Content-Type", "application/x-www-form-urlencoded");
     // 所要提交数据
     String httpRequestData = "api\_key=tPmAT5Ab3j7F9&sensor=BME280&value1=24.25&value2=49.54&value3=1005.14";           
     // 发起HTTP POST请求
     int httpResponseCode = http.POST(httpRequestData);

文章来源: https://iotsmart.blog.csdn.net/article/details/127169488