{
    "device_id": "KL001",
    "vin": "AAAABBBBCCCCDDDD1",
    "server_ip": "192.168.4.196",
    "server_port": 11883,
    "client_id": "test_device_001",
    "username": "zxwl",
    "password": "zxwl1234@",
    "qos": 1,
    "keep_alive": 15,
    "clean_session": true,
    "topics": {
        "uplink_1": "vehicle/data/",
        "uplink_2": "vehicle/notify/",
        "downlink": "vehicle/broadcast/"
    },
    "ports": {
        "config_port": 10001,
        "uplink_1_port": 10002,
        "uplink_2_port": 10003,
        "downlink_port": 10004
    }
}