How to use the tinode-sdk.MESSAGE_STATUS_READ function in tinode-sdk

} else if (this.props.received == Tinode.MESSAGE_STATUS_FAILED) {
      timestamp = formatMessage(messages.failed);
    } else {
      timestamp = shortDateFormat(this.props.timestamp, this.props.intl.locale);
    }

    let marker = null;
    if (this.props.received <= Tinode.MESSAGE_STATUS_SENDING) {
      marker = (<i>access_time</i>); // watch face
    } else if (this.props.received == Tinode.MESSAGE_STATUS_FAILED) {
      marker = (<i>warning</i>); // yellow icon /!\
    } else if (this.props.received == Tinode.MESSAGE_STATUS_SENT) {
      marker = (<i>done</i>); // checkmark
    } else if (this.props.received == Tinode.MESSAGE_STATUS_RECEIVED) {
      marker = (<i>done_all</i>); // double checkmark
    } else if (this.props.received == Tinode.MESSAGE_STATUS_READ) {
      marker = (<i>done_all</i>); // blue double checkmark
    }

    return (
      <span>
        {timestamp}{'\u00a0'}{marker}
      </span>
    );
  }
};