esp01s连接阿里云mqtt

要连接ESP01S到阿里云MQTT，需要进行以下步骤：

1. 注册阿里云账号并创建MQTT实例。
2. 下载Arduino IDE和相应的ESP01S库。
3. 在Arduino IDE中打开一个新的sketch，然后使用以下代码连接到阿里云MQTT：

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

// Replace with your WiFi network credentials
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// Replace with your Aliyun IoT MQTT Broker credentials
const char* mqttServer = "your_MQTT_BROKER_ENDPOINT";
const int mqttPort = 1883;
const char* mqttUser = "your_MQTT_USER";
const char* mqttPassword = "your_MQTT_PASSWORD";

// Create an instance of the WiFiClient object
WiFiClient espClient;

// Create an instance of the PubSubClient object
PubSubClient client(espClient);

void setup() {
  // Connect to WiFi network
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
  }
  
  // Connect to MQTT broker
  client.setServer(mqttServer, mqttPort);
  client.setCallback(callback);
  while (!client.connected()) {
    if (client.connect("ESP8266Client", mqttUser, mqttPassword)) {
      Serial.println("Connected to MQTT broker");
    } else {
      delay(1000);
    }
  }
  
  // Subscribe to a topic
  client.subscribe("your_MQTT_TOPIC");
}

void loop() {
  // Handle MQTT messages
  client.loop();
}

void callback(char* topic, byte* payload, unsigned int length) {
  // Handle MQTT messages
}

4. 将代码中的“your_SSID”，“your_PASSWORD”，“your_MQTT_BROKER_ENDPOINT”，“your_MQTT_USER”，“your_MQTT_PASSWORD”和“your_MQTT_TOPIC”替换为您的WiFi网络凭据，阿里云MQTT Broker凭据和订阅的MQTT主题。
5. 将ESP01S连接到计算机，并在Arduino IDE中选择正确的端口和板。
6. 上载代码到ESP01S，并观察串口输出，以确保ESP01S已成功连接到阿里云MQTT Broker并订阅了MQTT主题。