system:
  log:
    console:
      level: info # available levels: debug, info, warn, error, dpanic, panic, fatal
  http:
    defaultPort: 8080 # default HTTP listener assigned. Assigned to plugins like debug/health/metrics if they dont specify own port

plugins:
    enabled: # list of plugins server will load on startup
      - systree
      - prometheus
      - debug
      - health
      - auth_http
      - persistence_bbolt
    config: # configuration of each plugin
      <plugin type>:
        - backed: systree # plugin name, allowed: systree, prometheus, http, prof.profiler, health, bbolt
          name: http1     # required by auth plugins only. Value used in auth.order
          config:         # configuration passed to plugin on load stage. refer to particular plugin for configuration

auth:
  order: # default auth order. Authenticators invoked in the order they present in the config. Listener can override
    - internal

mqtt:
  version: // list of supported MQTT specifications
    - v3.1.1
    - v5.0
  keepAlive:
    period: 60 # KeepAlive The number of seconds to keep the connection live if there's no data.
    # Default is 60 seconds
    force: false # Force connection to use server keep alive interval (MQTT 5.0 only)
    # Default is false
  options:
    connectTimeout: 10 # The number of seconds to wait for the CONNACK message before disconnecting.
    # If not set then default to 2 seconds.
    offlineQoS0: true # OfflineQoS0 tell server to either persist (true) or not persist (false) QoS 0 messages for non-clean sessions
    # If not set than default is false
    sessionPreempt: true # AllowDuplicates Either allow or deny replacing of existing session if there new client with same clientID
    # If not set than default is false
    retainAvail: true # don't set to use default
    subsOverlap: false # tells server how to handle overlapping subscriptions from within one client
                       # - true server will send only one publish with max subscribed QoS even there are n subscriptions
                       # - false server will send as many publishes as amount of subscriptions matching publish topic exists
                       # Default is false
    subsId: false # don't set to use default
    subsShared: false # don't set to use default
    subsWildcard: true # don't set to use default
    receiveMax: 65535 # don't set to use default
    maxPacketSize: 268435455 # don't set to use default
    maxTopicAlias: 65535 # don't set to use default
    maxQoS: 2

listeners:
  defaultAddr: "0.0.0.0" # default 127.0.0.1
  mqtt: # there are two types of listeners allowed tcp and ws (aka WebSocket) 
    tcp:
      1883:                # port number. can be as many ports configurations as needed
        host: 127.0.0.1    # optional. listen address. defaultAddr is used if omitted
        auth:              # optional. default auth configuration is used if omitted
          order:           # optional. default auth configuration is used if omitted
            - internal
      1884:
        auth:
          order:
            - http1
        tls:               # TLS configuration
          cert:            # path to certificate file
          key:             # path to key file
    ws:
      8883:
        path: mqtt
        auth:
          order:
            - http1
      8884:
        path: mqtt
        auth:
          order:
            - http1
        tls:               # TLS configuration
          cert:            # path to certificate file
          key:             # path to key file