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# Module: VertxMqttServer::MqttMessage

Included in:
  MqttMessageImpl, MqttPublishMessage, MqttSubAckMessage, MqttSubscribeMessage, MqttUnsubscribeMessage
Defined in:
  /Users/julien/java/vertx-stack/stack-docs/target/rb/vertx-mqtt-server/mqtt_message.rb

## Instance Method Summary (collapse)

- - (Fixnum) message_id
  Message identifier.

## Instance Method Details

### - (`Fixnum`) message_id

Returns Message identifier

Returns:

- (`Fixnum`) —
  Message identifier

Raises:

- (`ArgumentError`)

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    # File '/Users/julien/java/vertx-stack/stack-docs/target/rb/vertx-mqtt-server/mqtt_message.rb', line 6

    def message_id
      if !block_given?
        if @cached_message_id != nil
          return @cached_message_id
        end
        return @cached_message_id = @j_del.java_method(:messageId, []).call()
      end
      raise ArgumentError, "Invalid arguments when calling message_id()"
    end