ESP32通过Arduino IDE向XAMPP发送RFID数据失败问题排查

核心问题与解决方法 #

• localhost地址错误
  ESP32代码中的localhost指代设备自身，而非运行XAMPP的电脑。必须替换为电脑在局域网内的IP地址（可通过电脑网络设置查看，格式如192.168.x.x）。

• 串口输入含多余字符
  Serial.readStringUntil('\n')读取的内容可能包含换行、回车符，导致POST数据格式异常。添加trim()清理输入：

  String input = Serial.readStringUntil('\n').trim();
  

• PHP脚本未正确接收数据
  确保script.php正确处理POST请求，示例代码：

  <?php
  if ($_SERVER['REQUEST_METHOD'] === 'POST') {
      $data = $_POST['data'] ?? 'No data received';
      // 写入文件验证接收情况
      file_put_contents('received_log.txt', $data . PHP_EOL, FILE_APPEND);
      echo "Received: " . $data;
  } else {
      echo "Invalid request";
  }
  ?>
  

  同时确认脚本放在XAMPP的htdocs目录下，路径匹配代码中的请求地址。

• 局域网连通性与防火墙拦截

  • 确认ESP32与电脑处于同一WiFi局域网
  • 检查电脑防火墙是否允许Apache的80端口入站请求

• 增强调试信息
  打印具体HTTP响应码，便于精准定位问题：

  Serial.print("HTTP Response Code: ");
  Serial.println(httpResponseCode);
  

修正后的完整代码 #

#include <WiFi.h>
#include <HTTPClient.h>

const char* ssid = "TP-Link_C028";
const char* password = "16810112";
// 替换为你的电脑局域网IP
const char* serverUrl = "http://192.168.1.100/script.php";

void setup() {
  Serial.begin(9600);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  Serial.println("Connected to WiFi");
  Serial.print("ESP32 IP Address: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  if (Serial.available()) {
    String input = Serial.readStringUntil('\n').trim();
    Serial.print("Received Serial Input: ");
    Serial.println(input);

    HTTPClient http;

    if (http.begin(serverUrl)) {
      http.addHeader("Content-Type", "application/x-www-form-urlencoded");
      String postData = "data=" + input;

      int httpResponseCode = http.POST(postData);

      Serial.print("HTTP Response Code: ");
      Serial.println(httpResponseCode);

      if (httpResponseCode > 0) {
        String response = http.getString();
        Serial.println("Server Response: " + response);
      } else {
        Serial.println("Error sending data: " + http.errorToString(httpResponseCode));
      }

      http.end();
    } else {
      Serial.println("Failed to initialize HTTP connection");
    }
  }
}

内容的提问来源于stack exchange，提问作者Young-Ja Han