STM32f103rct6开发板如何把烟雾值传到阿里云，使用mqtt协议的一系列代码

以下是将STM32f103rct6开发板上的烟雾传感器读取的数据通过MQTT协议上传到阿里云物联网平台的代码。需要使用到MQTT库，可以使用PubSubClient库。

#include <PubSubClient.h>
#include <Ethernet.h>

#define SMOKE_SENSOR_PIN A0
#define MQTT_SERVER "your_MQTT_SERVER"
#define MQTT_PORT 1883
#define MQTT_USERNAME "your_MQTT_USERNAME"
#define MQTT_PASSWORD "your_MQTT_PASSWORD"
#define MQTT_TOPIC "your_MQTT_TOPIC"

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 1, 177);
EthernetClient ethClient;
PubSubClient mqttClient(ethClient);

void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect
  }

  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    while (true) {
      delay(1);
    }
  }

  mqttClient.setServer(MQTT_SERVER, MQTT_PORT);
}

void loop() {
  int smoke = analogRead(SMOKE_SENSOR_PIN);
  Serial.print("Smoke sensor value: ");
  Serial.println(smoke);

  if (mqttClient.connected()) {
    String payload = String(smoke);
    mqttClient.publish(MQTT_TOPIC, payload.c_str());
    Serial.println("Published to MQTT");
  } else {
    Serial.print("Connecting to MQTT server...");
    if (mqttClient.connect("STM32f103rct6", MQTT_USERNAME, MQTT_PASSWORD)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.println(mqttClient.state());
    }
  }
  
  mqttClient.loop();
  delay(1000);
}

需要注意的是，MQTT协议需要连接到阿里云的物联网平台，需要在阿里云控制台中创建设备和Topic，并配置设备的身份验证信息。具体的步骤请参考阿里云的相关文档。