基于MQTT协议设备开发

2025-05-23

修改配置文件#

工程配置文件路径：code/dtu_config.json。

基于 TCP 私有服务器数据透传做如下配置：

默认 system_config.cloud 配置项定义为 "tcp" 即 TCP 透传模式，系统会自行读取 socket_private_cloud_config 配置项。此处改为 mqtt 协议模式。
```
{
   "system_config": {
       "cloud": "mqtt"  # The mqtt transparent transmission mode is configured by default
   }
}
```

本实验采用 MQTT 透传模式，用户需根据实际情况设置 mqtt_private_cloud_config 配置项中的 MQTT 服务器域名（server）、端口（port）、客户端id（client_id）以及订阅和发布主题等参数，如下。

{
   "mqtt_private_cloud_config": {
       "server": "mq.tongxinmao.com",
       "port": 18830,
       "client_id": "txm_1682300809",
       "user": "",
       "password": "",
       "clean_session": true,
       "qos": 0,
       "keepalive": 60,
       "subscribe": {"down": "/public/TEST/down"},  # Downlink data transparent topic
       "publish": {"up":  "/public/TEST/up"}  # Uplink data transparent transmission topic
   }
}

uart_config 配置项是串口配置参数，默认是根据当前实验开发板做的配置，不可更改。如用户采用其他开发板则需要根据实际硬件进行配置。

{
    "uart_config": {
        "port": 2,  # Serial port number. Set this parameter based on the actual hardware configuration
        "baudrate": 115200,  # Baud rate
        "bytesize": 8,  # data bits
        "parity": 0,  # Parity check
        "stopbits": 1,  # stop bit
        "flowctl": 0,  # fluid control

        }
    }
}

完整配置文件模版如下：

{
    "system_config": {
        "cloud": "tcp"
    },
    "mqtt_private_cloud_config": {
        "server": "mq.tongxinmao.com",
        "port": 18830,
        "client_id": "txm_1682300809",
        "user": "",
        "password": "",
        "clean_session": true,
        "qos": 0,
        "keepalive": 60,
        "subscribe": {"down": "/public/TEST/down"},
        "publish": {"up":  "/public/TEST/up"}
    },
    "socket_private_cloud_config": {
        "domain": "112.31.84.164",
        "port": 8305,
        "timeout": 5,
        "keep_alive": 5
    },
    "uart_config": {
        "port": 2,
        "baudrate": 115200,
        "bytesize": 8,
        "parity": 0,
        "stopbits": 1,
        "flowctl": 0,
        "rs485_config": {
        	"gpio_num": 28,
            "direction": 0
        }
    }
}