php - ESP8266-01 向 MySQL 发送 POST 请求

Question

我正在尝试向已设置的 MySQL 数据库发出 POST 请求。我试过各种教程都无济于事。我可以使用我创建的 PHP POST 页面通过浏览器输入数据，如下所示:

<?php
//post.php
include 'connect.php';
var_dump($_GET);
$id = $_GET['id'];
$value = $_GET['value'];
$id = mysql_real_escape_string($id);
$value = mysql_real_escape_string($value);

mysql_query(
"INSERT INTO iot (value, id) VALUES ('$value', '$id');"
)
?>

我首先尝试访问我自己的 PHP 站点并发送一个带有温度和露点的 POST 请求，如下所示:

//tempandhumidity2
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include "SimpleDHT.h"

SimpleDHT11 dht11;
const char* ssid = "nameofssid";
const char* password = "password";

int ledPin = 2; // GPIO2

void setup() {

Serial.begin(115200);                //Serial connection
WiFi.begin(ssid, password);   //WiFi connection

while (WiFi.status() != WL_CONNECTED) {  //Wait for the WiFI connection completion
  delay(500);
  Serial.println("Waiting for connection");
  }
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
Serial.print("Use this URL to connect: ");
Serial.print("http://");
Serial.print(WiFi.localIP());
Serial.println("/");
}

void loop() {
HTTPClient http;
http.begin("http://192.168.43.162/iot/post.php");
http.addHeader("Content-Type", "application/x-www-form-urlencoded");
int httpCode = http.POST("id=12&value=35");
Serial.println(httpCode);
if(httpCode == HTTP_CODE_OK)
{
   Serial.print("HTTP response code ");
   Serial.println(httpCode);
   String response = http.getString();
   Serial.println(response);
}
else
{
   Serial.println("Error in HTTP request");
}

http.end();
} 

返回:

Waiting for connection
Waiting for connection
Waiting for connection
Waiting for connection
Waiting for connection


Connecting to nameofssid
Use this URL to connect: http://192.168.43.176/
200
HTTP response code 200
Connected successfullyarray(0) {
}
<br />
<b>Notice</b>:  Undefined index: id in <b>C:\xampp\htdocs\iot\post.php</b> on line <b>4</b><br />
<br />
<b>Notice</b>:  Undefined index: value in <b>C:\xampp\htdocs\iot\post.php</b> on line <b>5</b><br />

使用带有 http://10.0.0.90/iot/post.php?id=14&value=33 的网络浏览器返回:

Connected successfullyarray(2) { ["id"]=> string(2) "14" ["value"]=> string(2) "33" }

我已经尝试执行 GET 请求，只是为了看看我是否可以在此处访问外部站点:

//tempandhumidity4
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>


const char *SERVER_WIFI_SSID = "nameofssid";
const char *SERVER_WIFI_PASS = "password";

void setup()
{
  Serial.begin(115200); 
  Serial.println("");
  Serial.println("Connecting to WiFi ");
  WiFi.begin(SERVER_WIFI_SSID,SERVER_WIFI_PASS);
  while(WiFi.status() != WL_CONNECTED){
     delay(500);
     Serial.print(".");
   }

   Serial.println("Connected");
}
void loop(){
HTTPClient http;
http.begin("http://www.nfl.com");
int httpCode = http.GET();
Serial.println(httpCode);
if(httpCode == HTTP_CODE_OK)
{
   Serial.print("HTTP response code ");
   Serial.println(httpCode);
   String response = http.getString();
   Serial.println(response);
}
else
{
   Serial.println("Error in HTTP request");
}

http.end();
} 

这将返回以下内容:

Connecting to WiFi 
.........Connected
400
Error in HTTP request
400

任何想法或建议将不胜感激？问题似乎是当我将我的 ESP8266 连接到我的手机然后尝试执行请求时我得到一个“-1”返回，这是连接被拒绝的。我已经尝试了几次，但无法弄清楚。可能是手机不允许我手动发送而不是使用浏览器吗？有什么想法吗？

Answer 1

有时发布您的问题可以帮助您解决问题。有两个问题:

1. 我的路由器一直在我用作网络服务器的计算机上给我不同的 IP。可能在每次我重置它之后。
2. 我在想什么!! post.php 正在使用 GET。这是新代码:

//post.php
include 'connect.php';
var_dump($_POST);
$id = $_POST['id'];
$value = $_POST['value'];
$id = mysql_real_escape_string($id);
$value = mysql_real_escape_string($value);

mysql_query(
    "INSERT INTO iot (value, id) VALUES ('$value', '$id');"
)

我现在可以发帖了。我收到一个错误，我会在其他地方查找:

Warning: Unexpected character in input: '' (ASCII=18) state=0 in C:\xampp\htdocs\iot\post.php on line 5