espocrm-base/application/Espo/Resources/metadata/app/webSocket.json

{
    "categories": {
        "newNotification": {},
        "appParamsUpdate": {},
        "recordUpdate": {
            "paramList": ["scope", "id"],
            "accessCheckCommand": "AclCheck --userId=:userId --scope=:scope --id=:id --action=read"
        },
        "streamUpdate": {
            "paramList": ["scope", "id"],
            "accessCheckCommand": "AclCheck --userId=:userId --scope=:scope --id=:id --action=stream"
        }
    },
    "messagers": {
        "ZeroMQ": {
            "senderClassName": "Espo\\Core\\WebSocket\\ZeroMQSender",
            "subscriberClassName": "Espo\\Core\\WebSocket\\ZeroMQSubscriber"
        }
    }
}