Feature request: Filter for SocktIO listeners

[viktorvorobev]

I've got a project, that emits me a several broadcasts with different payloads that looks something like that:

{
    "name": "my_frist_broadcast",
    "payload": {
        "some_usefull": "data"
    }
}


{
    "name": "my_second_broadcast",
    "payload": {
        "another_usefull": "data"
    }
}

It would be great if I could filter out messages from one listener by a payload that it consists of. Thanks!