auto_subscribe {
    topics = [
        ## {
        ##     topic = "/c/${clientid}"
        ##     qos   = 0
        ##     rh    = 0
        ##     rap   = 0
        ##     nl    = 0
        ## },
        ## {
        ##     topic = "/u/${username}"
        ## },
        ## {
        ##     topic = "/h/${host}"
        ##     qos   = 2
        ## },
        ## {
        ##     topic = "/p/${port}"
        ## },
        ## {
        ##     topic = "/topic/abc"
        ## },
        ## {
        ##     topic = "/client/${clientid}/username/${username}/host/${host}/port/${port}"
        ## }
    ]
}