Rate Limiter

Limiter is a new feature introduced in EMQX 5.0, it is a mechanism to restrict the number of messages that a client or topic can publish or subscribe to in a specified time period. For more information on the Limiter and how it works, see Rate limit.

For the moment, you can restrict the message rates from the following perspectives:

Type	Dashboard UI	Description	Recovery Behavior
bytes_rate	Data Publish Rate per Client	Incoming message size in bytes per second per client	Pause receiving client messages
messages_rate	Messages Publish Rate per Client	Incoming messages per second per client	Pause receiving client messages
max_conn_rate	Maximum Connection Rate per Listener	Connections per second per listener	Pause receiving new connections

For example, to set a limiter for the default TCP listener, you can work with the code below:

listeners.tcp.default {
  bind = "0.0.0.0:1883"
  max_conn_rate = "1000/s"
  messages_rate = "1000/s"
  bytes_rate = "1MB/s"
}

TIP

EMQX has offered more configuration items to better serve customized needs, you can continue to read Configuration Manual.