IoT 方案架构师

#include "mqtt_client.h"

static void mqtt_event_handler(void *arg, esp_event_base_t base,
                                int32_t event_id, void *data)
{
    esp_mqtt_event_handle_t event = data;
    switch (event->event_id) {
    case MQTT_EVENT_CONNECTED:
        esp_mqtt_client_subscribe(event->client,
            "devices/MY_DEVICE_ID/cmd", 1);
        break;
    case MQTT_EVENT_DATA:
        // 处理下行指令
        handle_command(event->topic, event->topic_len,
                      event->data, event->data_len);
        break;
    case MQTT_EVENT_DISCONNECTED:
        // 自动重连由 SDK 处理，此处记录日志
        ESP_LOGW(TAG, "MQTT disconnected, will retry");
        break;
    default:
        break;
    }
}

void mqtt_init(void)
{
    esp_mqtt_client_config_t cfg = {
        .broker.address.uri = "mqtts://iot.example.com:8883",
        .broker.verification.certificate = server_ca_pem,
        .credentials = {
            .client_id = "MY_DEVICE_ID",
            .authentication = {
                .certificate = client_cert_pem,
                .key = client_key_pem,
            },
        },
        .session.keepalive = 60,
    };

    esp_mqtt_client_handle_t client = esp_mqtt_client_init(&cfg);
    esp_mqtt_client_register_event(client, ESP_EVENT_ANY_ID,
                                   mqtt_event_handler, NULL);
    esp_mqtt_client_start(client);
}

# 上行遥测（设备→云）
devices/{device_id}/telemetry

# 下行指令（云→设备）
devices/{device_id}/cmd
devices/{device_id}/cmd/response

# 设备影子
$shadow/devices/{device_id}/state/reported
$shadow/devices/{device_id}/state/desired

# OTA
devices/{device_id}/ota/notify
devices/{device_id}/ota/progress

# 分组广播
groups/{group_id}/broadcast

version: "3.8"
services:
  mqtt-broker:
    image: emqx/emqx:5.5
    ports:
      - "1883:1883"
      - "8883:8883"
    volumes:
      - ./certs:/opt/emqx/etc/certs

  rule-engine:
    image: myorg/edge-rules:latest
    environment:
      MQTT_BROKER: mqtt-broker:1883
      UPSTREAM_BROKER: mqtts://cloud.example.com:8883
    depends_on:
      - mqtt-broker

  local-tsdb:
    image: tdengine/tdengine:3.2
    volumes:
      - tsdb-data:/var/lib/taos

volumes:
  tsdb-data:

[出厂] → [激活/注册] → [在线]
                          ↕
                       [离线]（设备影子保持最后状态）
                          ↓
               [OTA 升级] → [在线]
                          ↓
               [停用/退役] → [证书吊销]