emqx4.3/rel/config/examples/rate_limit.conf.example

## Rate Limit

## Rate limiting is applied on the listener
listeners.tcp.my_tcp_listener_name {

    ## Connections per second per listener
    max_conn_rate = "1000/s"

    ## Incoming messages per second per client
    messages_rate = "1000/s"

    ## Incoming message size in bytes per second per client
    bytes_rate = "1MB/s"
}