[
    {
        "id": 1,
        "device_uid": "861045088533008",
        "device_name": "O2-LTE-ESP32",
        "hostname": "O2-LTE-ESP32",
        "approved": 1,
        "is_active": 1,
        "current_operator": "O2 - UK",
        "signal_bars": 3,
        "signal_label": "Good",
        "rssi_dbm": -71,
        "rsrp_dbm": -999,
        "speed_kn": "0.00",
        "sats_gnss": 0,
        "serving_system": "LTE",
        "lat": null,
        "lon": null,
        "alt_m": "0.00",
        "gps_valid": 0,
        "sample_time_utc": "",
        "created_at": "2026-04-10 08:43:20",
        "display_time": "2026-04-10 08:43:20"
    }
]