{
    "id": "ui_broadcast",
    "msg_subclass": "hub.firmware.update.progress",
    "initiator": {
        "api_name": "some api name here",
        "connection_type": "UI",
        "peer_unique_id": "23/3"
    },
    "result": {
        "completed": 10,
        "error": null,
        "operationId": "_ID_",
        "serial": "_SERIAL_",
        "status": "started"
    }
}