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

##--------------------------------------------------------------------
## Flapping Detect
##
## Ban the client when the times of connections exceed the limit in the time window
##--------------------------------------------------------------------
## Note: This is an example of how to configure this feature
##       you should copy and paste the below data into the emqx.conf for working

flapping_detect {
    ## use false to disabled
    enable = true

    ## Time window for flapping detection
    window_time = 1m

    ## Maximum number of connects allowed for a MQTT Client in window_time
    max_count = 15

    ## How long the flapping clientid will be banned
    ban_time = 5m
}