{
    "_id" : ObjectId("59c9e021af4886c9149a28c7"),
    "userkey" : "r1Et2ZNdW",
    "devicekey" : "12345",
    "analog" : {
        "4" : 458,
        "6" : 448,
        "7" : 100
    },
    "__v" : 0
}

DeviceModel.update({_id : device.id}, {$set : {"analog" : analog}}, function(err, doc){
            if(err) throw err;
            console.log("Device switches updated");
});