Esp32-ethernet-kit_A_V1.2 使用mqtt协议，实现客户端与服务器通信，数据上报给服务器包括客户端设备ID，用户名ＩＰ地址，端口号，连接时间，连接状态等等

最新推荐文章于 2025-10-02 08:30:00 发布

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最新推荐文章于 2025-10-02 08:30:00 发布 · 753 阅读

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CC 4.0 BY-SA版权

本文介绍ESP32使用MQTT协议与服务器交互的过程，包括客户端配置、事件处理及发布订阅操作。通过示例代码展示了如何连接MQTT服务器并进行消息收发。

ＩＤＦ：esp-idf-v4.0.1\examples\protocols\mqtt\tcp

tcp端口号使用1883

ws端口号使用8083

客户端代码如下：

/* MQTT (over TCP) Example

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/

#include <stdio.h>
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include "esp_wifi.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "esp_event.h"
#include "tcpip_adapter.h"
#include "protocol_examples_common.h"

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "freertos/queue.h"

#include "lwip/sockets.h"
#include "lwip/dns.h"
#include "lwip/netdb.h"

#include "esp_log.h"
#include "mqtt_client.h"

static const char *TAG = "MQTT_EXAMPLE";


static esp_err_t mqtt_event_handler_cb(esp_mqtt_event_handle_t event)
{
    esp_mqtt_client_handle_t client = event->client;
    int msg_id;
    // your_context_t *context = event->context;
    switch (e