Bluetooth data parsing problem

[Eldar_Maharramli]

Hi, I want to parse Bluetooth data coming from Arduino to 9 separate textboxes. But, it seems the data packet isn't received as a whole, so the app can't parse the the data and gives some errors. I've used \n symbol (newline in ascii is 10) as delimiter byte for Bluetooth, but it didn't solve the problem.

The problem isn't related to Arduino because I can see on com port data coming from Arduino is like this:

#1,0.16,0.00,0.00,0.00,-2,0.13,3,1000.00$
#1,0.05,0.00,0.00,0.00,-2,0.11,5,1000.00$
#1,0.43,0.00,0.00,0.00,-2,0.11,7,1000.00$
#1,0.49,0.00,0.00,0.00,-2,0.05,9,1000.00$
#1,0.38,0.00,0.00,0.00,-2,0.14,11,1000.00$
#1,0.27,0.00,0.00,0.00,-2,0.20,13,1000.00$
#1,0.22,0.00,0.00,0.00,-2,0.11,15,1000.00$
#1,0.16,0.00,0.00,0.00,-2,0.09,17,1000.00$

Here is my aia project: https://drive.google.com/file/d/1_FBWcWqHqa9w0EOUIblsU-F-sYnBRpSX/view?usp=sharing
My Arduino code is pretty complex, so I'm sharing one piece of it where I send the data packet to the app:

void serialSendPkg()
{
if ((currentMillis - lastMillis) >= delayTime)
{
String dataToSend = "";
//send package begin
dataToSend += '#';
dataToSend += String(device_state);
dataToSend += (",");
dataToSend += String(printVoltage);
dataToSend += (",");
dataToSend += String(printCurrent);
dataToSend += (",");
dataToSend += String(printResistance);
dataToSend += (",");
dataToSend += String(printCapacitance);
dataToSend += (",");
dataToSend += String(pwr_state);
dataToSend += (",");
dataToSend += String(pwr_voltage);
dataToSend += (",");
dataToSend += String(testCounter);
dataToSend += (",");
dataToSend += String(delayTime + delayWhileSending);
testCounter += 1;
if (testCounter > 64000)
{
testCounter = 0;
}
dataToSend += ("$");
Serial.println(dataToSend);
dataToSend = "";
//send package end
lastMillis = currentMillis;
}
}

Thanks before.

[ABG]

This is a corrected version of your timer, draggable.

For the board, this was your original, before I fixed the number of bytes and added list length checking (edit - deleted, because I posted the wrong Clock component's Timer event - ABG)

Standard Delimiter advice:

Please see the Delimiter article in FAQ

FAQ Section: Bluetooth < version 4 (BlueTooth Client) and Arduino

Arduino HC-06 tutorials Arduino USB - Pavitra and Thunkable Arduino via USB Delimiter usage for receiving one message per ReadText DHT22 Temperature or Humidity, no Clock - kio4.com How to send CR the hard way http://www.martyncurrey.com/android-mit-app-inventor-auto-connect-to-bluetooth/ Instructables YouTube course on Arduino/AI2 - Magesh Jayakumar Martyn Arduino Bluetooth sketch Sending Slider Data to Arduino - Neil Kenyon Turning a LED on and off with an Arduino, a HC-06 and Andr…

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

ReceiveText(numberOfBytes)
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.