添加 MQTT 定时发布传感器数据功能，支持将数据打包成 JSON 格式并发布

main/main.cpp

@@ -28,6 +28,7 @@
 #include "esp_system.h"
 #include "esp_efuse.h"
 #include "esp_efuse_table.h"
+#include "esp_timer.h"
 #include "sntp_time.h"
 #include "bh1750_use.h"
 #include "aht30.h"
@@ -38,6 +39,7 @@
 #include "hx711.hpp"
 #include "su-03t.h"
 #include "agri_env.h"
+#include "cJSON.h"
 
 #define TAG "MAIN"
 #define CO2_SPOILAGE_THRESHOLD_PPM 1500.0f
@@ -459,6 +461,68 @@ static void hx711_task(void *arg)
     }
 }
 
+/* 函数: mqtt_publish_task
+ * 作用: 定时将传感器数据打包成JSON并发布到MQTT
+ */
+static void mqtt_publish_task(void *arg)
+{
+    (void)arg;
+    for (;;)
+    {
+        if (agri_env_mqtt_is_connected())
+        {
+            env_data_t local_data;
+            if (s_env_data_lock)
+            {
+                xSemaphoreTake(s_env_data_lock, portMAX_DELAY);
+                local_data = s_env_data;
+                xSemaphoreGive(s_env_data_lock);
+                
+                cJSON *root = cJSON_CreateObject();
+                if (root)
+                {
+                    cJSON_AddStringToObject(root, "time", local_data.time_str);
+                    cJSON_AddNumberToObject(root, "lux", local_data.lux);
+                    cJSON_AddNumberToObject(root, "temp", local_data.temp);
+                    cJSON_AddNumberToObject(root, "humidity", local_data.humidity);
+                    cJSON_AddNumberToObject(root, "gas_percent", local_data.gas_percent);
+                    cJSON_AddNumberToObject(root, "tvoc", local_data.tvoc);
+                    cJSON_AddNumberToObject(root, "hcho", local_data.hcho);
+                    cJSON_AddNumberToObject(root, "co2", local_data.co2);
+                    cJSON_AddNumberToObject(root, "ice_weight", local_data.ice_weight);
+                    cJSON_AddNumberToObject(root, "fire_percent", local_data.fire_percent);
+                    
+                    cJSON_AddBoolToObject(root, "fire_danger", local_data.fire_danger);
+                    cJSON_AddBoolToObject(root, "human_present", local_data.human_present);
+                    cJSON_AddBoolToObject(root, "door_closed", local_data.door_closed);
+                    cJSON_AddBoolToObject(root, "fan_on", local_data.fan_on);
+                    cJSON_AddBoolToObject(root, "light_on", local_data.light_on);
+                    cJSON_AddBoolToObject(root, "cool_on", local_data.cool_on);
+                    cJSON_AddBoolToObject(root, "hot_on", local_data.hot_on);
+                    
+                    cJSON_AddNumberToObject(root, "su03t_last_msgno", local_data.su03t_last_msgno);
+                    cJSON_AddNumberToObject(root, "su03t_rx_count", local_data.su03t_rx_count);
+
+                    // 补充系统及其他分析状态数据
+                    cJSON_AddStringToObject(root, "ip_address", wifi_connect_get_ip());
+                    cJSON_AddStringToObject(root, "food_status", local_data.co2 >= CO2_SPOILAGE_THRESHOLD_PPM ? "spoilage" : "good");
+                    cJSON_AddNumberToObject(root, "uptime_s", esp_timer_get_time() / 1000000ULL);
+                    cJSON_AddNumberToObject(root, "free_heap_kb", esp_get_free_heap_size() / 1024);
+
+                    char *json_str = cJSON_PrintUnformatted(root);
+                    if (json_str)
+                    {
+                        agri_env_mqtt_publish(CONFIG_AGRI_ENV_MQTT_PUBLISH_TOPIC, json_str, 0, 0);
+                        free(json_str); // 注意 cJSON_PrintUnformatted 使用 malloc 分配内存
+                    }
+                    cJSON_Delete(root);
+                }
+            }
+        }
+        vTaskDelay(pdMS_TO_TICKS(5000)); // 每5秒发布一次
+    }
+}
+
 /* 函数: app_main
  * 作用: 执行模块内与函数名对应的业务逻辑。
  * 重点: 关注输入合法性、返回码与并发安全。
@@ -630,4 +694,7 @@ extern "C" void app_main(void)
 
     // 独立任务：继电器状态同步到 UI
     xTaskCreate(relay_status_task, "relay_status_task", 4096, NULL, 5, NULL);
+
+    // 独立任务：MQTT 定时发布传感器数据
+    xTaskCreate(mqtt_publish_task, "mqtt_publish_task", 4096 * 2, NULL, 5, NULL);
 }