Handle Bluetooth Connection Lost

Projects Networking, Protocols, and Devices
1

Hello.

I'm developing an arduino program for control a set of WS2812 Leds with the phone.

I've made an android app that simulates the typical controller behaviours and add a couple more of funcionalities. The data is sent to the arduino throught the bluetooth using a byte buffer. Then the arduino checks if there is data available and reads it storing in a uint_16t.

All the connection works good except when this is lost, the character that is sent from the BT when the connection is lost is readed as a control code and produces errors.

So, how can i ignore that character or avoid to be sent?

The bluetooth module that i use is the JDY 31

2

oscarvx:
All the connection works good except when this is lost, the character that is sent from the BT when the connection is lost is readed as a control code and produces errors.

You need to post your Arduino program.

If a character is received it suggests that the connection has not actually been lost - more likely that the sender and receiver have become out of sync with each other.

...R

3

This is the code of the app:

private class ConnectedThread{
        private final BluetoothSocket socket;
        private final OutputStream outputStream;


        public ConnectedThread(BluetoothSocket ss){
            socket = ss;
            OutputStream OS = null;
            try{
                OS = socket.getOutputStream();
            } catch (IOException e){}

            outputStream = OS;
        }

        public void write(byte[] bytes){
            try{
                outputStream.write(bytes);
                Log.d("Data send:", bytes.toString());
            } catch (IOException e) {}
        }

        public void cancel(){
            try{
                socket.close();
            } catch (IOException e) {}
        }
    }

The method write(byte[] bytes) its called when an option is selected, the codes are integers between 00010-34000

This method creates the message:

   public void onCodeToSend(short code) {
        byte [] buff = intToBytes(code);

        int newDim = buff.length + 1;

        char c = '*';


        buff = Arrays.copyOf(buff, newDim);
        buff[newDim - 1] = (byte) c;

        if(buff != null) connectThread.connectedThread.write(buff);
        else Toast.makeText(this.getBaseContext(), "Buffer null", Toast.LENGTH_SHORT);
    }

     public byte[] intToBytes(short x){

        return ByteBuffer.allocate(Short.BYTES).putShort(x).array();
    }

On the arduino i have this functions:

Main loop:

void loop() {

  
  if(Serial.available()){
    uint16_t code;


    code = readData();


    delay(25);    
    clean_buffer();
    delay(25);
    switch(code/10000){
      case 1:
        manual(code);
        break;
      case 0:
        break;
      case 2:
        automatico(code);
        break;
      default:
        //Serial.println("Error");
        clean_buffer();
        break;
    }
   clean_buffer();
       
  }
   delay(25); 
}

Function used to read the data from the BT:

uint16_t readData(){

  char endMarker = '*';
  byte bytes[2];
  int i = 0;
  char c;
  boolean newData = false;

  while(Serial.available() > 0 && !newData){
    c = Serial.read();
    delay(50);
    if(c != endMarker){      
      bytes[i] = (byte)c;
      i++;
    }
    else{
      newData = true;
    }  
  }

  uint16_t val = byteToLong(bytes[0], bytes[1]);
  return val;  
}


uint16_t byteToLong(byte byte1, byte byte2){
  return byte1 << 8
        | byte2;

}

Then i have code for control the stips, in some sequences that are in a infinite loop the input is checked every iteration:

while(true){
do_strip_control()
if(Serial.available())
          return_to_main;
}

The problem becomes when I close the app or a time is elapsed and the sync is lost, some type of control message is sent.

4

Please just post the complete program in one piece so we don't have to join the parts.

...R