Buffer overflow makes thread exit.

`package org.godotengine.godot;
import android.app.Activity; import android.app.AlertDialog; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import android.os.Handler; import android.os.Message; //import android.support.v7.app.AppCompatActivity; import android.content.DialogInterface; import android.util.Log; import android.widget.Toast; import android.content.Intent;
import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.UUID; import java.util.Set; import java.util.ArrayList; import java.util.List;
/**
Created by Rodrigo Favarete, Mad Forest Games' Lead Game Developer, on September 8, 2017 */
public class GodotBluetooth extends Godot.SingletonBase {
protected Activity activity;
private boolean initialized;
private boolean pairedDevicesListed = false;
boolean connected = false;
boolean bluetoothRequired = true;

private static final int REQUEST_ENABLE_BT = 1;
private static final int MESSAGE_READ = 2;
private int instanceId = 0;

Object[] pairedDevicesAvailable;

ConnectedThread cThread;
Handler localHandler;

StringBuilder receivedData = new StringBuilder();
private static String macAdress;
String remoteBluetoothName;
String[] externalDevicesDialogAux;
private static final String TAG = "godotbluetooth";

BluetoothAdapter localBluetooth;
BluetoothDevice remoteBluetooth;
BluetoothSocket socket;
UUID bluetoothUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

/* Methods
 * ********************************************************************** */

/**
 * Initialize the Module
 */

public void init(final int newInstanceId, final boolean newBluetoothRequired) {
    if (!initialized) {
        activity.runOnUiThread(new Runnable() {
            @Override 
            public void run() 
            {
                localBluetooth = BluetoothAdapter.getDefaultAdapter();
                if(localBluetooth == null) 
                {
                    Toast.makeText(activity, "ERROR: Bluetooth Adapter not found!", Toast.LENGTH_LONG).show();
                    activity.finish();
                }
                else if (!localBluetooth.isEnabled())
                {
                    Intent enableBluetoothIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                    activity.startActivityForResult(enableBluetoothIntent, REQUEST_ENABLE_BT);
                }
                instanceId = newInstanceId;
                bluetoothRequired = newBluetoothRequired;
                initialized = true;

                localHandler = new Handler()
                {
                    @Override
                    public void handleMessage(Message msg) 
                    {
                        if(msg.what == MESSAGE_READ)
                        {
                            String newData = (String) msg.obj;
                            receivedData.append(newData);

                            int endElement = receivedData.indexOf("}");
                            if(endElement > 0) 
                            {
                                String completeData = receivedData.substring(0, endElement);
                                int dataSize = completeData.length();

                                if(receivedData.charAt(0) == '{') 
                                {
                                    String finalizedData = receivedData.substring(1, dataSize);
                                    GodotLib.calldeferred(instanceId, "_on_data_received", new Object[]{ finalizedData });
                                }

                                receivedData.delete(0, receivedData.length());
                            }
                        }
                    }
                };
            }
        });
    }
}

/**
 * Gets a list of all external devices that are already paired with the local device
 */

public void getPairedDevices(final boolean nativeDialog) {
    if (initialized) {
        activity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                if(connected) {
                        try {
                            socket.close();
                            connected = false;
                            pairedDevicesListed = false;
                            Toast.makeText(activity, "Bluetooth Disconnected!", Toast.LENGTH_LONG).show();
                            GodotLib.calldeferred(instanceId, "_on_disconnected", new Object[]{});
                        }
                        catch (IOException e) {
                            Toast.makeText(activity, "ERROR: \n" + e, Toast.LENGTH_LONG).show();
                        }
                }
                else{
                    if (nativeDialog){
                        nativeLayoutDialogBox();
                    }
                    else {
                        listPairedDevices();
                    }
                }
            }
        });
    }

    else {
        Toast.makeText(activity, "ERROR: Module Wasn't Initialized!", Toast.LENGTH_LONG).show();
    }
}

/**
 * Native dialog box to show paired external devices
 */

private void nativeLayoutDialogBox() {
    String localDeviceName = localBluetooth.getName();
    String localDeviceAddress = localBluetooth.getAddress();

    Set<BluetoothDevice> pairedDevices = localBluetooth.getBondedDevices();

    if(pairedDevices.size() > 0) {
        pairedDevicesAvailable = (Object []) pairedDevices.toArray();

        List<String> externalDeviceInfo = new ArrayList<String>();

        for (BluetoothDevice device : pairedDevices) {
            String externalDeviceName = device.getName();
            String externalDeviceAddress = device.getAddress();

            externalDeviceInfo.add(externalDeviceName + "\n" + externalDeviceAddress);
        }
        externalDevicesDialogAux = new String[externalDeviceInfo.size()];
        externalDevicesDialogAux = externalDeviceInfo.toArray(new String[externalDeviceInfo.size()]);;
    }

    AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle("Choose a Device To Connect!");
        builder.setItems(externalDevicesDialogAux, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                connect(which);
            }
        });
        pairedDevicesListed = true;
        AlertDialog dialog = builder.create();
        dialog.show();
}

/**
 * Organizes and sends to Godot all external paired devices
 */

private void listPairedDevices() {

    String localDeviceName = localBluetooth.getName();
    String localDeviceAddress = localBluetooth.getAddress();

    Set<BluetoothDevice> pairedDevices = localBluetooth.getBondedDevices();

    if(pairedDevices.size() > 0) {
        pairedDevicesAvailable = (Object []) pairedDevices.toArray();
        int externalDeviceID = 0;

        for (BluetoothDevice device : pairedDevices) {
            String externalDeviceName = device.getName();
            String externalDeviceAddress = device.getAddress();

            GodotLib.calldeferred(instanceId, "_on_single_device_found", new Object[]{ externalDeviceName, externalDeviceAddress, externalDeviceID });
            externalDeviceID += 1;
        }

        pairedDevicesListed = true;
    }
}

/**
 * Prepares to connect to another device, identified by the 'newExternalDeviceID'
 */

public void connect(final int newExternalDeviceID){
    if (initialized && pairedDevicesListed) {
        activity.runOnUiThread(new Runnable() {
            @Override
                public void run() {
                    if(!connected){
                        BluetoothDevice device = (BluetoothDevice) pairedDevicesAvailable[newExternalDeviceID];

                        macAdress = device.getAddress();
                        remoteBluetoothName = device.getName();

                        createSocket(macAdress);
                    }
                    else{
                        try {
                            socket.close();
                            connected = false;
                            pairedDevicesListed = false;
                            Toast.makeText(activity, "Bluetooth Disconnected!", Toast.LENGTH_LONG).show();
                        }
                        catch (IOException e) {
                            Toast.makeText(activity, "ERROR: \n" + e, Toast.LENGTH_LONG).show();
                        }
                    }
                }
        });
    }
    else {
        Toast.makeText(activity, "ERROR: Module Wasn't Initialized!", Toast.LENGTH_LONG).show();
    }
}

/**
 * Creates the Socket to communicate with another device and establishes the connection
 */

private void createSocket (String MAC) {

    remoteBluetooth = localBluetooth.getRemoteDevice(MAC);

    try {
        socket = remoteBluetooth.createRfcommSocketToServiceRecord(bluetoothUUID);
        socket.connect();
        connected = true;
        pairedDevicesListed = true;
        cThread = new ConnectedThread(socket);
        cThread.start();
        GodotLib.calldeferred(instanceId, "_on_connected", new Object[]{ remoteBluetoothName, macAdress });
        Toast.makeText(activity, "Connected With " + remoteBluetoothName, Toast.LENGTH_LONG).show();
        }

    catch (IOException e) {
        pairedDevicesListed = false;
        connected = false;
        GodotLib.calldeferred(instanceId, "_on_connected_error", new Object[]{ });
        Toast.makeText(activity, "ERROR: Cannot connect to " + MAC, Toast.LENGTH_LONG).show();
    }
}

/**
 * Calls the method that converts the desired data from String to Bytes and sends it to the connected device
 */

public void sendData(final String dataToSend){

    if (initialized) {
        activity.runOnUiThread(new Runnable() {
            @Override
                public void run() {
                    if(connected) {
                        cThread.sendData(dataToSend);
                    }
                    else {
                        Toast.makeText(activity, "Bluetooth not connected!", Toast.LENGTH_LONG).show();
                    }
                }
        });
    }
}

/**
 * Calls the method that sends data as bytes to the connected device
 */

public void sendDataBytes(final byte[] dataBytesToSend){

    if (initialized) {
        activity.runOnUiThread(new Runnable() {
            @Override
                public void run() {
                    if(connected) {
                        cThread.sendDataBytes(dataBytesToSend);
                    }
                    else {
                        Toast.makeText(activity, "Bluetooth not connected!", Toast.LENGTH_LONG).show();
                    }
                }
        });
    }
}

/**
 * Class responsible for communication between connected devices
 */

private class ConnectedThread extends Thread {

    private final InputStream mmInStream;
    private final OutputStream mmOutStream;

    public ConnectedThread(BluetoothSocket newSocket) {

        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        try {
            tmpIn = newSocket.getInputStream();
            tmpOut = newSocket.getOutputStream();
        } catch (IOException e) { }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }

    public void run() 
    {
        /*
        byte[] buffer = new byte[1024];
        int bytes;

        while (true) 
        {
            try 
            {
                bytes = mmInStream.read(buffer);
                String externalData = new String(buffer, 0, bytes);
                localHandler.obtainMessage(MESSAGE_READ, bytes, -1, externalData).sendToTarget();
            } 

            catch (IOException e) 
            {
                break;
            }
        }
        */
        BufferedReader br = new BufferedReader(new InputStreamReader(mmInStream));

        while(true)
        {
            try
            {
                // bytes = mmInStream.read(buffer);
                String resp = br.readLine();
                //Transfer these data to the UI thread
                Message msg = new Message();
                msg.what = MESSAGE_READ;
                msg.obj = resp;
                localHandler.sendMessage(msg);
            }
            catch(IOException e)
            {
                break;
            }
        }
    }

    public void sendData(String dataToSend) {

        byte[] dataBuffer = dataToSend.getBytes();

        try {
            mmOutStream.write(dataBuffer);
        } 
        catch (IOException e) { }
    }

    public void sendDataBytes(byte[] bytes) {

        try {
            mmOutStream.write(bytes);
        } 
        catch (IOException e) { }
    }
}

/**
 * Internal callbacks
 */

@Override
protected void onMainActivityResult(int requestCode, int resultCode, Intent data) {

    switch (requestCode) {
        case REQUEST_ENABLE_BT:

            if(resultCode == Activity.RESULT_OK) {
                Toast.makeText(activity, "Bluetooth Activated!", Toast.LENGTH_LONG).show();
            }
            else {
                if(bluetoothRequired){
                    Toast.makeText(activity, "Bluetooth wasn't activated, application closed!", Toast.LENGTH_LONG).show();
                    activity.finish();
                }
                else{
                    Toast.makeText(activity, "Bluetooth wasn't activated!", Toast.LENGTH_LONG).show();
                }
            }

            break;

        default:
            Toast.makeText(activity, "ERROR: Unknown situation!", Toast.LENGTH_LONG).show();
    }
}

/* Definitions
 * ********************************************************************** */

/**
 * Initilization of the Singleton
 */

static public Godot.SingletonBase initialize(Activity p_activity)
{
    return new GodotBluetooth(p_activity);
}

/**
 * Constructor
 */

public GodotBluetooth (Activity activity) 
{
    registerClass("GodotBluetooth", new String[]
    {
        "init", 
        "getPairedDevices",
        "connect",
        "sendData",
        "sendDataBytes",
    });

    this.activity = activity;
}
} ` this is fixed listening thread that don't buffer overflow.
favarete / GodotBluetooth

Buffer overflow makes thread exit. #8
