How to use the azure-iot-mqtt-base.MqttBase function in azure-iot-mqtt-base

this._config = config;
    this._topicTelemetryPublish = 'devices/' + this._config.deviceId + '/messages/events/';
    this._topicMessageSubscribe = 'devices/' + this._config.deviceId + '/messages/devicebound/#';
    this._topicMethodSucbscribe = '$iothub/methods/POST/#';

    debug('topic publish: ' + this._topicTelemetryPublish);
    debug('topic subscribe: ' + this._topicMessageSubscribe);
    const sdkVersionString = encodeURIComponent('azure-iot-device/' + packageJson.version);

    /*Codes_SRS_NODE_DEVICE_MQTT_16_016: [The Mqtt constructor shall initialize the `uri` property of the `config` object to `mqtts://`.]*/
    (this._config as any).uri = 'mqtts://' + config.host;
    /* Codes_SRS_NODE_DEVICE_MQTT_18_025: [ If the Mqtt constructor receives a second parameter, it shall be used as a provider in place of mqtt.js ]*/
    if (provider) {
      this._mqtt = provider;
    } else {
      this._mqtt = new MqttBase(sdkVersionString);
    }

    /* Codes_SRS_NODE_DEVICE_MQTT_18_026: When MqttTransport fires the close event, the Mqtt object shall emit a disconnect event */
    this._mqtt.on('error', (err) => {
      debug('on close');
      this._fsm.handle('disconnect', () => {
        this.emit('disconnect', err);
      });
    });

    this._mqtt.on('message', this._dispatchMqttMessage.bind(this));

    // MQTT topics to subscribe to
    this._topics = {
      'message': {
        name: this._topicMessageSubscribe,

constructor(mqttBase?: MqttBase) {
    super();
    this._mqttBase = mqttBase || new MqttBase();
    this._config.pollingInterval = ProvisioningDeviceConstants.defaultPollingInterval;

    const responseHandler = (topic: string, payload: any) => {
      let payloadString: string = payload.toString('ascii');
      debug('message received on ' + topic);
      debug('request payload is: ' + payloadString);

      /* Codes_SRS_NODE_PROVISIONING_MQTT_18_010: [ When waiting for responses, `registrationRequest` shall watch for messages with a topic named $dps/registrations/res//?$rid=.] */
      /* Codes_SRS_NODE_PROVISIONING_MQTT_18_024: [ When waiting for responses, `queryOperationStatus` shall watch for messages with a topic named $dps/registrations/res//?$rid=.] */
      let match = topic.match(/^\$dps\/registrations\/res\/(.*)\/\?(.*)$/);

      if (!!match && match.length === 3) {
        let queryParameters = queryString.parse(match[2]);
        if (queryParameters.$rid) {
          let rid: string = queryParameters.$rid as string;
          if (this._operations[rid]) {