如何使用ESP32cam在bme680传感器的mqtt上发布数据

#include <WiFi.h>
#include <PubSubClient.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME680.h>

// Wi-Fi连接信息
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// MQTT服务器信息
const char* mqtt_server = "your_MQTT_SERVER";
const int mqtt_port = 1883;
const char* mqtt_topic = "your_MQTT_TOPIC";

// BME680传感器对象
Adafruit_BME680 bme;

// MQTT客户端对象
WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  // 初始化串口
  Serial.begin(115200);

  // 连接Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // 连接MQTT服务器
  client.setServer(mqtt_server, mqtt_port);
  while (!client.connected()) {
    if (client.connect("ESP32-CAM")) {
      Serial.println("Connected to MQTT server");
    } else {
      Serial.print("Failed to connect to MQTT server, rc=");
      Serial.println(client.state());
      delay(2000);
    }
  }

  // 初始化BME680传感器
  if (!bme.begin()) {
    Serial.println("Failed to initialize BME680 sensor");
    while (1);
  }
}

void loop() {
  // 读取传感器数据
  float temperature = bme.readTemperature();
  float humidity = bme.readHumidity();
  float pressure = bme.readPressure() / 100.0;
  float gasResistance = bme.readGasResistance() / 1000.0;

  // 将数据转换为JSON格式
  String jsonPayload = "{\"temperature\":" + String(temperature) +
                       ",\"humidity\":" + String(humidity) +
                       ",\"pressure\":" + String(pressure) +
                       ",\"gasResistance\":" + String(gasResistance) + "}";

  // 发布数据到MQTT主题
  if (client.connected()) {
    client.publish(mqtt_topic, jsonPayload.c_str());
    Serial.println("Published data to MQTT topic");
  }

  // 延时一段时间
  delay(5000);
}