ESP32与Laravel项目通信遇404错误，请求技术协助

核心问题 #

Laravel项目本身运行正常，但ESP32请求Laravel的指定URL时返回404，原因是路由不匹配+通信逻辑颠倒：ESP32作为客户端主动拉取命令，但Laravel未提供对应路由；同时原Laravel代码错误地尝试向ESP32发送POST请求（ESP32未做服务器监听）。

1. 修复Laravel路由与命令存储逻辑 #

新增路由 #

在routes/web.php中添加ESP32拉取命令的GET路由：

// 前端提交命令的路由（保留原路由）
Route::post('/irrigation_control/esp32/action', [IrrigationControlController::class, 'controlSystem'])->name('irrigation.esp32');
// ESP32拉取命令的路由
Route::get('/irrigation_control/esp32/command', [IrrigationControlController::class, 'getCommand']);

修改控制器代码 #

更新controlSystem方法，将命令存入缓存（替代原错误的POST请求逻辑）：

use Illuminate\Support\Facades\Cache;

public function controlSystem(Request $request) {
    $action = $request->input('command');
    // 将命令存入缓存，有效期1分钟
    Cache::put('irrigation_command', $action, 60);
    
    $message = 'System ' . ($action === 'activate' ? 'activated!' : 'deactivated!');
    return redirect()->route('irrigation.index')->with('message', $message);
}

// 新增方法：返回ESP32需要的命令
public function getCommand() {
    $command = Cache::get('irrigation_command', '');
    // 返回后清空缓存，避免重复执行
    Cache::forget('irrigation_command');
    return response()->json(['command' => $command]);
}

2. 调整ESP32请求与解析逻辑 #

ESP32需解析Laravel返回的JSON数据，同时修正请求注释（原代码误写为POST）：

#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h> // 需要安装ArduinoJson库

const char* ssid = "<wifiname>";
const char* password = "<wifipass>";
const char* serverName = "http://<ip-address>/irrigation_control/esp32/command";

const int PIN_RELAY = 4;
const int PIN_LED = 32;
const int PIN_SENSOR = 35;
const int dryThreshold = 3000;

void setup() {
  Serial.begin(115200);
  pinMode(PIN_RELAY, OUTPUT);     
  pinMode(PIN_LED, OUTPUT);
  digitalWrite(PIN_RELAY, LOW);
  
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    digitalWrite(PIN_LED, LOW);
    Serial.print("Connecting to Wifi...");
    delay(1000);
  }
  digitalWrite(PIN_LED, HIGH);
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void loop(){
  if (WiFi.status() == WL_CONNECTED){
    HTTPClient http;
    http.begin(serverName);
    http.addHeader("Content-Type", "application/json");

    int httpResponseCode = http.GET(); 

    if (httpResponseCode == HTTP_CODE_OK) {
      String payload = http.getString();
      Serial.println("Received payload: " + payload);
      
      // 解析JSON数据
      DynamicJsonDocument doc(1024);
      deserializeJson(doc, payload);
      String command = doc["command"].as<String>();

      Serial.println("Command received: " + command);

      if (command == "activate") {
         int moistureLevel = analogRead(PIN_SENSOR);
         Serial.print("Soil Moisture Level: ");
         Serial.println(moistureLevel);

         if (moistureLevel > dryThreshold) {
           digitalWrite(PIN_RELAY, HIGH);
           Serial.println("Soil is dry. Activating relay.");
         } else {
           digitalWrite(PIN_RELAY, LOW);
           Serial.println("Soil is moist. Relay is off.");
         }
      }
    } else {
      Serial.print("Error on GET request: ");
      Serial.println(httpResponseCode);
    }
    http.end();
  } else {
    digitalWrite(PIN_LED, LOW);
    delay(500);
    digitalWrite(PIN_LED, HIGH);
    delay(500);
    Serial.println("Wifi Disconnected");
  }  
  delay(10000);
}

3. 确认XAMPP配置正确性 #

因为Laravel在htdocs外，需确保Apache配置正确：

• 启用mod_rewrite（修改httpd.conf，去掉#LoadModule rewrite_module modules/mod_rewrite.so前的注释）
• 配置虚拟主机，指向Laravel的public目录：

<VirtualHost *:80>
    ServerName irrigation.local
    DocumentRoot "C:/path/to/your/laravel/public"
    <Directory "C:/path/to/your/laravel/public">
        AllowOverride All
        Require all granted
    </Directory>
</VirtualHost>

• 修改系统hosts文件，添加127.0.0.1 irrigation.local映射

内容的提问来源于stack exchange，提问作者mona molina