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

## Flapping Detect
##
## Ban the client when the times of connections exceed the limit in the configured time window

flapping_detect {
    ## use 'true' to enable this feature
    enable = false

    ## 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
}