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

newState.messages.push(m);
      }
    });

    // msg could be null if one or more messages were deleted.
    if (msg && !msg.deleted) {
      // If the message is added to the end of the message list,
      // scroll to the bottom.
      if (topic.isNewMessage(msg.seq)) {
        newState.scrollPosition = 0;
      }

      // Aknowledge messages except own messages. They are
      // automatically assumed to be read and recived.
      const status = topic.msgStatus(msg);
      if (status >= Tinode.MESSAGE_STATUS_SENT && msg.from != this.props.myUserId) {
        this.props.readTimerHandler(() => {
          topic.noteRead(msg.seq);
        });
      }
      this.props.onData(msg);
    }
    this.setState(newState);
  }

const {formatMessage} = this.props.intl;
    let timestamp;
    if (this.props.received <= Tinode.MESSAGE_STATUS_SENDING) {
      timestamp = formatMessage(messages.sending);
    } 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>
    );
  }
};

tnData(data) {
    const topic = this.tinode.getTopic(data.topic);
    if (topic.msgStatus(data) >= Tinode.MESSAGE_STATUS_SENT && data.from != this.state.myUserId) {
      clearTimeout(this.receivedTimer);
      this.receivedTimer = setTimeout(() => {
        this.receivedTimer = undefined;
        topic.noteRecv(data.seq);
      }, RECEIVED_DELAY);
    }
  }