Adding text items in a list and displaying in a list view

Hi everybody
I receive 18 texts via Bluetooth and want to display them in a listview, but instead of receiving a display of text in each line, I receive a display of all 18 text strings in one line


Thanks in advance

Show us the sketch that sends the data

void loop() {
  if (SerialBT.available()) {
    char command =;
  //Update date and time sent from android to ds3231
  if (command == '1') {
    String receivedData = SerialBT.readStringUntil('\n');
    Serial.println("Received data: " + receivedData);

    //Send the current date and time to android
    else if (command == '2') {
      //SerialBT.println("ESP32 ontroller"); 
    //Save 18 strings from android to array
    else if (command == '3') {
      if (!StringReceived) {
    //Send all array to android
    else if (command == '4') {
    for (int i = 0; i < rows; i++) {

     // delay(10);

     //Reset ESP
    else if (command == '5') {
    command = 0;   //Clear parameter
// DateTime code block
DateTime now =;
static int lastMinute = now.minute();

if (now.minute() != lastMinute) {
  lastMinute = now.minute();
   // Construct a string with the desired format
    String timestampStr = String( + "/" + String(now.month()) + "/" + String(now.year()) + " " +
                          String(now.hour()) + ":" + (now.minute() < 10 ? "0" : "") +
                          String(now.minute(), DEC); // Add leading zero using DEC format




And there is more ...

Here is a simple BlueTooth text receiver sample, for single value per line:
initialize global message to

You omitted the use of listview, which is the problematic thing I encountered, I want to use listview because it allows me to edit a line that I would like to execute in the future.
Is there another way to receive a string and display in each line with listview?

You used the value -1 instead of ByteAvailableToReceive what is the difference?

Be sure to use println() at the end of each message to send from the sending device, to signal end of message.

Only use print() in the middle of a message.

Be sure not to println() in the middle of a message, or you will break it into two short messages and mess up the item count after you split the message in AI2.

Do not rely on timing for this, which is unreliable.

In the AI2 Designer, set the Delimiter attribute of the BlueTooth Client component to 10 to recognize the End of Line character.
Also, return data is not immediately available after sending a request,
you have to start a Clock Timer repeating and watch for its arrival in the Clock Timer event. The repeat rate of the Clock Timer should be faster than the transmission rate in the sending device, to not flood the AI2 buffers.

In your Clock Timer, you should check

  Is the BlueTooth Client still Connected?
  Is Bytes Available > 0?
     IF Bytes Available > 0 THEN
       set message var  to BT.ReceiveText(-1) 

This takes advantage of a special case in the ReceiveText block:

Receive text from the connected Bluetooth device. If numberOfBytes is less than 0, read until a delimiter byte value is received.

If you are sending multiple data values per message separated by | or comma, have your message split into a local or global variable for inspection before trying to select list items from it. Test if (length of list(split list result) >= expected list length) before doing any select list item operations, to avoid taking a long walk on a short pier. This bulletproofing is necessary in case your sending device sneaks in some commentary messages with the data values.

Some people send temperature and humidity in separate messages with distinctive prefixes like "t:" (for temperature) and "h:" (for humidity).
(That's YAML format.)

The AI2 Charts component can recognize these and graph them. See Bluetooth Client Polling Rate - #12 by ABG

To receive YAML format messages, test if the incoming message contains ':' . If true, split it at ':' into a list variable, and find the prefix in item 1 and the value in item 2.

Here are lots of loggers ...

I will make the necessary changes not now, in any case thank you very much, I will update here later