Root Machine 
{
    "state": "idle",
    "event": {
        "type": ""
    },
    "previousEvent": null
}

 Sub Machine 
{
    "state": "idle",
    "event": {
        "type": ""
    },
    "previousEvent": null
}

 Sub2 Machine 
{
    "state": "idle",
    "event": {
        "type": ""
    },
    "previousEvent": null
}