Please write me esp idf sample code to implement mqtt broker on esp32
时间: 2023-05-17 18:06:07 浏览: 65
Sure, here is a sample code to implement MQTT broker on ESP32 using ESP-IDF:
#include <stdio.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_log.h"
#include "esp_event.h"
#include "esp_netif.h"
#include "esp_wifi.h"
#include "esp_mqtt.h"
#define WIFI_SSID "your_wifi_ssid"
#define WIFI_PASS "your_wifi_password"
#define MQTT_BROKER "mqtt://your_mqtt_broker_ip"
#define MQTT_TOPIC "your_mqtt_topic"
static const char *TAG = "MQTT_BROKER";
static esp_err_t wifi_event_handler(void *ctx, system_event_t *event)
{
switch(event->event_id) {
case SYSTEM_EVENT_STA_START:
esp_wifi_connect();
break;
case SYSTEM_EVENT_STA_CONNECTED:
break;
case SYSTEM_EVENT_STA_GOT_IP:
ESP_LOGI(TAG, "Got IP: %s", ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
esp_mqtt_start(MQTT_BROKER, NULL, 0, NULL);
break;
case SYSTEM_EVENT_STA_DISCONNECTED:
esp_wifi_connect();
break;
default:
break;
}
return ESP_OK;
}
static void mqtt_event_handler(void *handler_args, esp_event_base_t base, int32_t event_id, void *event_data)
{
esp_mqtt_event_handle_t event = (esp_mqtt_event_handle_t)event_data;
switch (event_id) {
case MQTT_EVENT_CONNECTED:
ESP_LOGI(TAG, "MQTT_EVENT_CONNECTED");
esp_mqtt_subscribe(event->client, MQTT_TOPIC, 0);
break;
case MQTT_EVENT_DISCONNECTED:
ESP_LOGI(TAG, "MQTT_EVENT_DISCONNECTED");
break;
case MQTT_EVENT_SUBSCRIBED:
ESP_LOGI(TAG, "MQTT_EVENT_SUBSCRIBED");
break;
case MQTT_EVENT_UNSUBSCRIBED:
ESP_LOGI(TAG, "MQTT_EVENT_UNSUBSCRIBED");
break;
case MQTT_EVENT_PUBLISHED:
ESP_LOGI(TAG, "MQTT_EVENT_PUBLISHED");
break;
case MQTT_EVENT_DATA:
ESP_LOGI(TAG, "MQTT_EVENT_DATA");
ESP_LOGI(TAG, "Topic=%.*s", event->topic_len, event->topic);
ESP_LOGI(TAG, "Data=%.*s", event->data_len, event->data);
break;
case MQTT_EVENT_ERROR:
ESP_LOGI(TAG, "MQTT_EVENT_ERROR");
break;
default:
ESP_LOGI(TAG, "Other event id:%d", event_id);
break;
}
}
void app_main()
{
esp_netif_init();
esp_event_loop_create_default();
esp_netif_create_default_wifi_sta();
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
esp_wifi_init(&cfg);
esp_wifi_set_storage(WIFI_STORAGE_RAM);
wifi_config_t wifi_config = {
.sta = {
.ssid = WIFI_SSID,
.password = WIFI_PASS,
},
};
esp_wifi_set_mode(WIFI_MODE_STA);
esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config);
esp_wifi_start();
esp_event_handler_instance_t wifi_event_handler_instance;
esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &wifi_event_handler, NULL, &wifi_event_handler_instance);
esp_mqtt_client_config_t mqtt_cfg = {
.event_handle = mqtt_event_handler,
};
esp_mqtt_client_handle_t mqtt_client = esp_mqtt_client_init(&mqtt_cfg);
esp_mqtt_client_start(mqtt_client);
}