{
    "received_at": "2026-07-20 11:33:12",
    "payload": {
        "device_uid": "DEV-001",
        "device_type": "red_tag",
        "heartbeat": "yes",
        "date": "2026-07-20",
        "time": "11:33:09",
        "run_status": 0,
        "frequency": 0,
        "rpm": 0,
        "interface": "WiFi"
    }
}