PHP と MQTT を使用してリアルタイム天気予報アプリケーションを作成する方法

git clone https://github.com/bluerhinos/phpMQTT.git

<?php
require("phpMQTT.php");

<?php
require("phpMQTT.php");

$server = "localhost";  // MQTT服务器的主机名或IP地址
$port = 1883;  // MQTT服务器的端口号
$client_id = "weather_app";  // 定义客户端ID

$mqtt = new phpMQTT($server, $port, $client_id);
if ($mqtt->connect()) {
    echo "Connected to MQTT server.
";
    // 订阅气象站频道
    $mqtt->subscribe("weather_station/#", 0);
    
    // 持续循环以接收来自气象站的消息
    while ($mqtt->proc()) {
    }
} else {
    echo "Failed to connect to MQTT server.
";
}
$mqtt->close();
?>

<?php
require("phpMQTT.php");

// ...

function messageReceived($topic, $payload) {
    // 接收到消息时调用此函数
    $data = json_decode($payload, true);
    
    // 解析天气数据
    $temperature = $data['temperature'];
    $humidity = $data['humidity'];
    $wind_direction = $data['wind_direction'];
    
    // 显示天气数据
    echo "Temperature: ".$temperature."°C
";
    echo "Humidity: ".$humidity."%
";
    echo "Wind Direction: ".$wind_direction."
";
}

$mqtt->debug = true;
$mqtt->onMessage('messageReceived');

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>

// 定义WiFi连接信息
const char* ssid = "your_wifi_ssid";
const char* password = "your_wifi_password";

// 定义MQTT服务器信息
const char* mqtt_server = "mqtt_server_ip";
const char* mqtt_topic = "weather_station";

WiFiClient espClient;
PubSubClient mqttClient(espClient);

void setup() {
  // 连接WiFi
  WiFi.begin(ssid, password);
  
  // 连接MQTT服务器
  mqttClient.setServer(mqtt_server, 1883);
  
  // 设置回调函数
  mqttClient.setCallback(callback);
  
  // 读取传感器数据并发布
  float temperature = readTemperature();
  float humidity = readHumidity();
  String windDirection = readWindDirection();
  publishData(temperature, humidity, windDirection);
}

void loop() {
  // 接收MQTT消息
  mqttClient.loop();
}

void callback(char* topic, byte* payload, unsigned int length) {
  // 不处理接收消息的回调函数
  // 可以添加自己的逻辑以处理接收到的消息
}

void publishData(float temperature, float humidity, String windDirection) {
  // 构造JSON字符串
  String json = "{"temperature":" + String(temperature) + ",";
  json += ""humidity":" + String(humidity) + ",";
  json += ""wind_direction":"" + windDirection + ""}";
  
  // 发布消息到MQTT服务器
  mqttClient.publish(mqtt_topic, json.c_str());
}