[ {
  owls ,
  [
    { secure, true },
    { role , node },
    { node_id , 1 },
    { server_port, 1883 },
    { num_listeners, 50 },
    { num_servers, 100 }
    ]}
  ,
  {lager,
    [
      {log_root, "/app_data/logs"},
      {colored,true},
      {handlers,
        [
          {lager_console_backend, [{level,error}]},
          {lager_file_backend, [{file, "error.log"}, {level, error}, {size, 10485760}, {date, "$D0"}, {count, 5}]},
          {lager_file_backend, [{file, "info.log"}, {level, info}, {size, 10485760}, {date, "$D0"}, {count, 5}]},
          {lager_file_backend, [{file, "warning.log"}, {level, warning}, {size, 10485760}, {date, "$D0"}, {count, 5}]}
        ]}
    ] }
].