emqx4.3/examples/gateway.mqttsn.conf.example

##--------------------------------------------------------------------
## Gateway MQTT-SN
##
## Add a MQTT-SN gateway
##--------------------------------------------------------------------
## 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

gateway.mqttsn {

    ## When publishing or subscribing, prefix all topics with a mountpoint string.
    ## It's a way that you can use to implement isolation of message routing between different
    ## gateway protocols
    mountpoint = "mqttsn/"

    ## Whether to periodically broadcast ADVERTISE messages
    broadcast = true

    ## The Gateway ID.
    ## When the broadcast option is enabled, the gateway will broadcast ADVERTISE message with this value
    gateway_id = 1

    ## Allows connectionless clients to publish messages with a Qos of -1.
    ## This feature is defined for very simple client implementations which do not support any other
    ## features except this one. There is no connection setup nor tear down, no registration nor
    ## subscription. The client just sends its 'PUBLISH' messages to a GW
    enable_qos3 = false

    ## The pre-defined topic IDs and topic names
    predefined = [
        {id = 1, topic = "predefined/topic1"},
        {id = 2, topic = "predefined/topic2"}
    ]

    listeners.udp.default {
        bind = "0.0.0.0:1884"
    }
}