GET /devices?serialNumber=12345
[
    {
        "id": 1,
        "serialNumber": "12345"
    }
]

GET /devices?serialNumber=12345
[
    {
        "id": 1,
        "serialNumber": "12345"
    },
     {
        "id": 2,
        "serialNumber": "78901"
    }
]

GET /devices?serialNumber=12345
[
    {
        "id": 1,
        "serialNumber": "12345"
        "connected":
        {
            "id": 2,
            "serialNumber": "78901"
        }
    }
]