[Bug] Zenoh uses the MQTT plugin as a server, but it cannot connect to port 1883 normally.

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Describe the bug

Zenoh uses the MQTT plugin as a server, but it cannot connect to port 1883 normally.

To reproduce

2025-01-23T08:11:04.540764139Z 2025-01-23T08:11:04.540550Z  INFO main ThreadId(01) zenohd: zenohd v1.1.1 built with rustc 1.75.0 (82e1608df 2023-12-21)
2025-01-23T08:11:04.541059430Z 2025-01-23T08:11:04.540894Z  INFO main ThreadId(01) zenohd: Initial conf: {"access_control":{"default_permission":"deny","enabled":false,"policies":null,"rules":null,"subjects":null},"adminspace":{"enabled":true,"permissions":{"read":true,"write":false}},"aggregation":{"publishers":[],"subscribers":[]},"connect":{"endpoints":["tcp/[::]:7447","tcp/[::]:1883"],"exit_on_failure":null,"retry":null,"timeout_ms":null},"downsampling":[],"id":"b9a6660ca2e315a6af6a6aa78ecad45f","listen":{"endpoints":["tcp/[::]:7447","tcp/[::]:1883"],"exit_on_failure":null,"retry":null,"timeout_ms":null},"metadata":null,"mode":"router","open":{"return_conditions":{"connect_scouted":null,"declares":null}},"plugins":{"mqtt":{"auth":{"dictionary_file":"/etc/zenoh/mqtt-pwfile"},"port":"0.0.0.0:1883"}},"plugins_loading":{"enabled":true,"search_dirs":[{"kind":"current_exe_parent","value":null},".","~/.zenoh/lib","/opt/homebrew/lib","/usr/local/lib","/usr/lib"]},"qos":{"publication":[]},"queries_default_timeout":null,"routing":{"interests":{"timeout":null},"peer":{"mode":null},"router":{"peers_failover_brokering":null}},"scouting":{"delay":null,"gossip":{"autoconnect":null,"enabled":null,"multihop":null,"target":null},"multicast":{"address":null,"autoconnect":null,"enabled":true,"interface":null,"listen":null,"ttl":null},"timeout":null},"timestamping":{"drop_future_timestamp":null,"enabled":null},"transport":{"auth":{"pubkey":{"key_size":null,"known_keys_file":null,"private_key_file":null,"private_key_pem":null,"public_key_file":null,"public_key_pem":null},"usrpwd":{"dictionary_file":null,"password":null,"user":null}},"link":{"protocols":null,"rx":{"buffer_size":65535,"max_message_size":1073741824},"tcp":{"so_rcvbuf":null,"so_sndbuf":null},"tls":{"close_link_on_expiration":null,"connect_certificate":null,"connect_private_key":null,"enable_mtls":null,"listen_certificate":null,"listen_private_key":null,"root_ca_certificate":null,"so_rcvbuf":null,"so_sndbuf":null,"verify_name_on_connect":null},"tx":{"batch_size":65535,"keep_alive":4,"lease":10000,"queue":{"batching":{"enabled":true,"time_limit":1},"congestion_control":{"block":{"wait_before_close":5000000},"drop":{"max_wait_before_drop_fragments":50000,"wait_before_drop":1000}},"size":{"background":1,"control":1,"data":4,"data_high":2,"data_low":2,"interactive_high":1,"interactive_low":1,"real_time":1}},"sequence_number_resolution":"32bit","threads":5},"unixpipe":{"file_access_mask":null}},"multicast":{"compression":{"enabled":false},"join_interval":2500,"max_sessions":1000,"qos":{"enabled":false}},"shared_memory":{"enabled":true},"unicast":{"accept_pending":100,"accept_timeout":10000,"compression":{"enabled":false},"lowlatency":false,"max_links":1,"max_sessions":1000,"open_timeout":10000,"qos":{"enabled":true}}}}
2025-01-23T08:11:04.541128380Z 2025-01-23T08:11:04.541060Z  INFO main ThreadId(01) zenoh::net::runtime: Using ZID: b9a6660ca2e315a6af6a6aa78ecad45f
2025-01-23T08:11:04.541299126Z 2025-01-23T08:11:04.541219Z  INFO main ThreadId(01) zenoh::api::loader: Loading  plugin "mqtt"
2025-01-23T08:11:04.543176600Z 2025-01-23T08:11:04.542993Z  INFO main ThreadId(01) zenoh::api::loader: Starting  plugin "mqtt"
2025-01-23T08:11:04.543415747Z 2025-01-23T08:11:04.543298Z  INFO main ThreadId(01) zenoh::api::loader: Successfully started plugin mqtt from "/usr/lib/libzenoh_plugin_mqtt.so"
2025-01-23T08:11:04.543434182Z 2025-01-23T08:11:04.543331Z  INFO main ThreadId(01) zenoh::api::loader: Finished loading plugins
2025-01-23T08:11:04.544688244Z 2025-01-23T08:11:04.544416Z  INFO main ThreadId(01) zenoh::net::runtime::orchestrator: Zenoh can be reached at: tcp/172.21.0.2:1883
2025-01-23T08:11:04.544717533Z 2025-01-23T08:11:04.544448Z  INFO main ThreadId(01) zenoh::net::runtime::orchestrator: Zenoh can be reached at: tcp/172.21.0.2:7447
2025-01-23T08:11:04.544724323Z 2025-01-23T08:11:04.544508Z  INFO main ThreadId(01) zenoh::net::runtime::orchestrator: zenohd listening scout messages on 224.0.0.224:7446

zenoh.config5

/**
 * Configuration file for the Eclipse zenoh router (service "zenohd").
 *
 * This file presents only the main settings. For a complete example of configuration file,
 * see https://github.com/eclipse-zenoh/zenoh/blob/master/EXAMPLE_CONFIG.json5
 */
{
  /**
   * The identifier (as hex-string) that zenohd must use.
   * If not set, a random unsigned 128bit integer will be used.
   * WARNING: this id must be unique in your zenoh network.
   */
  // id: "123456789ABCDEF",

  /**
   * Which endpoints to listen on. E.g. tcp/localhost:7447.
   * By configuring the endpoints, it is possible to tell zenoh which are the endpoints that other routers,
   * peers, or client can use to establish a zenoh session.
   * If none are specified, "tcp/[::]:7447" will be used (i.e. any interface)
   */
  listen: {
    endpoints: [
      // "<proto>/<address>"
      "tcp/[::]:7447",
      "tcp/[::]:1883"
    ],
  },

  /**
   * Which endpoints to connect to. E.g. tcp/localhost:7447.
   * By configuring the endpoints, it is possible to tell zenoh which router/peer to connect to at startup.
   */
  connect: {
    endpoints: [
      // "<proto>/<address>"
      "tcp/[::]:7447",
      "tcp/[::]:1883"
    ],
  },

  /**
   * Configuration of the scouting protocol (for discovery of other routers, peers or clients)
   * Uncoment to change the default values.
   */
  // scouting: {
  //   /* How multicast should behave */
  //   multicast: {
  //     /* Whether multicast scouting is enabled or not */
  //     enabled: true,
  //     /* The socket which should be used for multicast scouting */
  //     address: "224.0.0.224:7446",
  //     /* The network interface which should be used for multicast scouting */
  //     interface: "auto", // auto selection of interface
  //     /**
  //      * An autoconnection mask (accepted values are bit-or-like combinations of peer, router and client).
  //      * If the configured instance's mode intersects with this field, zenoh will automatically establish a connection with other nodes discovered through this method of scouting.
  //      */
  //     autoconnect: "peer|client",
  //   },
  // },

  /**
   * Directories where plugins configured by name should be looked for.
   * Plugins configured by __path__ are not subject to lookup
   */
//  plugins_search_dirs: ["/usr/lib"],

  plugins: {
    /**
     * REST plugin configuration. Uncomment to activate it.
     */
    // rest: {
    //   /* Setting this option to true allows zenohd to panic should it detect issues with this plugin.
    //    * Setting it to false politely asks the plugin not to panic. */
    //   __required__: true,
    //   http_port: 8000,
    // },
    /**
     * Storages plugin configuration . Uncomment to activate it and configure backends/storages
     */
    // storages: {
    //   /* Storages are grouped by backend, which may implement the storage function in various ways. */
    //   backends: {
    //     /* The memory backend is always available, and stores values in RAM. */
    //     memory: {
    //       /* Each backend may manage several storages */
    //       storages: {
    //         /* Each storage must be named */
    //         demo: {
    //           key_expr: "demo/example/**",
    //         },
    //       },
    //     },
    //   },
    // },
    mqtt: {
      ////
      //// port: The address to bind the MQTT server. Default: "0.0.0.0:1883". Accepted values:'
      ////       - a port number ("0.0.0.0" will be used as IP to bind, meaning any interface of the host)
      ////       - a string with format `<local_ip>:<port_number>` (to bind the MQTT server to a specific interface).
      ////
      port: "0.0.0.0:1883",
      ////
      //// MQTT client authentication related configuration.
      ////
      auth: {
        ////
        //// dictionary_file: Path to a file containing the MQTT client username/password dictionary.
        ////
        dictionary_file: "/etc/zenoh/mqtt-pwfile"
      }
    }
  },
}

System info

platform:ubuntu 22.04 64bit
zenoh version：1.1.1-amd64