Edit
Successful addon update process broadcasts 
				
					{
    "id": "ui_broadcast",
    "msg_subclass": "hub.software.update.progress",
    "result": {
        "completed": 0,
        "error": null,
        "operationId": "_ID_",
        "serial": "92000123",
        "status": "started"
    }
}
{
    "id": "ui_broadcast",
    "msg_subclass": "hub.software.update.progress",
    "result": {
        "completed": 20,
        "error": null,
        "operationId": "_ID_",
        "serial": "92000123",
        "status": "process"
    }
}
...
{
    "id": "ui_broadcast",
    "msg_subclass": "hub.software.update.progress",
    "result": {
        "completed": 100,
        "error": null,
        "operationId": "_ID_",
        "serial": "92000123",
        "status": "finished"
    }
}
Edit
Error during firmware update process broadcasts 
				
					{
    "id": "ui_broadcast",
    "msg_subclass": "hub.software.update.progress",
    "result": {
        "completed": 0,
        "error": null,
        "operationId": "_ID_",
        "serial": "92000123",
        "status": "started"
    }
}
...
{
    "id": "ui_broadcast",
    "msg_subclass": "hub.software.update.progress",
    "result": {
        "completed": 100,
        "error": {
            "code": -32500,
            "data": "ezlo.update.internal.operation",
            "message" "Update operations error"
        },
        "operationId": "_ID_",
        "serial": "92000123",
        "status": "aborted"
    }
}