ESP32如何链接腾讯云的云服务器

ESP32可以通过MQTT协议连接腾讯云的云服务器。具体步骤如下：

1.注册腾讯云账号并开通IoT服务。

2.创建设备和产品，获取设备证书和密钥。

3.在腾讯云控制台中创建一个IoT Hub，选择MQTT协议并设置订阅和发布Topic。

4.在ESP32上安装MQTT库，并编写代码实现设备与云服务器的连接和通信。

以下是一个示例代码，需要将其中的设备证书、密钥、Wi-Fi名称和密码等信息替换成自己的：

#include <WiFi.h>
#include <PubSubClient.h>

const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* mqtt_server = "your_mqtt_server_address";
const char* client_id = "your_client_id";
const char* username = "your_device_name";
const char* password_mqtt = "your_device_secret";
const char* topic_pub = "your_publish_topic";
const char* topic_sub = "your_subscribe_topic";

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
    if (client.connect(client_id, username, password_mqtt)) {
      Serial.println("Connected to MQTT");
      client.subscribe(topic_sub);
    } else {
      Serial.print("Failed with state ");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  
  String message = "Hello World";
  client.publish(topic_pub, message.c_str());
  delay(1000);
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message received: ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

void reconnect() {
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
    if (client.connect(client_id, username, password_mqtt)) {
      Serial.println("Connected to MQTT");
      client.subscribe(topic_sub);
    } else {
      Serial.print("Failed with state ");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

参考链接：https://cloud.tencent.com/document/product/1081/34739