MQTT订阅/OTA更新深度睡眠/ESP32/FreeRTOS

要实现MQTT订阅、OTA更新、深度睡眠和ESP32、FreeRTOS的功能，您可以按照以下步骤操作：

1. 配置WiFi连接和MQTT客户端：

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

const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* mqtt_server = "mqtt_server_IP";
const int mqtt_port = 1883;
const char* mqtt_username = "mqtt_username";
const char* mqtt_password = "mqtt_password";

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
  delay(10);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
}

void callback(char* topic, byte* payload, unsigned int length) {
  // 处理订阅消息
}

void reconnect() {
  while (!client.connected()) {
    if (client.connect("ESP32", mqtt_username, mqtt_password)) {
      client.subscribe("OTA_TOPIC");
    } else {
      delay(500);
    }
  }
}

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
}

2. 配置OTA更新：

#include <WiFiOTA.h>

void setup() {
  WiFi.begin(ssid, password);
  while (WiFi.waitForConnectResult() != WL_CONNECTED) {
    delay(500);
  }
  WiFiOTA.begin();
}

void loop() {
  WiFiOTA.handle();
  // 其他代码
}

3. 配置深度睡眠：

#include <esp_deep_sleep.h>

const int wakeupPin = GPIO_NUM_32;
const int wakeupTrigger = HIGH;

void setup() {
  pinMode(wakeupPin, INPUT_PULLUP);
}

void loop() {
  esp_sleep_enable_ext0_wakeup((gpio_num_t)wakeupPin, wakeupTrigger);
  esp_deep_sleep_start();
}

4. 配置FreeRTOS：

#include <WiFi.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>

const int ledPin = 2;

void task1(void* parameter) {
  while (true) {
    digitalWrite(ledPin, HIGH);
    vTaskDelay(1000 / portTICK_PERIOD_MS);
    digitalWrite(ledPin, LOW);
    vTaskDelay(1000 / portTICK_PERIOD_MS);
  }
}

void setup() {
  pinMode(ledPin, OUTPUT);
  xTaskCreatePinnedToCore(task1, "Task 1", 10000, NULL, 1, NULL, 0);
}

void loop() {
  // 其他代码
}

以上代码示例可以实现MQTT订阅、OTA更新、深度睡眠和ESP32、FreeRTOS的功能。您可以根据自己的需求进行修改和扩展。