Write to sd card from phone app via bluetooth using arduino uno

I have written a code with the help of [Write to sd card from phone app via bluetooth] discussion 
// program to receive test data Iinto a null termnated character
// array (string) and write the string to a SD card
// using methods from Robin2's serial input basics
// by C. Goulding
 
#include <SoftwareSerial.h>
#include <SPI.h>
#include <SD.h>
 
const byte csSD = 4;//10;
 
File testDataFile;
SoftwareSerial ssPort(0,1);    //(RX, TX)
 
const byte numChars = 32; //**** adjust this number for the longest data set
                          // can be up to 255.
char receivedChars[numChars];
boolean newData = false;  // true whenever new data comes in
                          // must be set to false before new data can be read
void setup()
{
   Serial.begin(9600);
   ssPort.begin(9600);
   initSD();
   Serial.println(F("starting test data reception"));
   delay(3000);
}
 
void loop()
{
   recvWithStartEndMarkers();  // get new data if it is there
   if (newData == true) // got new data, save it to SD
   {
      //Serial.print(F("This data just received   "));
      Serial.println(receivedChars);
      testDataFile = SD.open("test.txt", FILE_WRITE);
      if (testDataFile)
      {
         //Serial.print(F("Writing to test.txt..."));
         testDataFile.println(receivedChars);
         testDataFile.close();
        // Serial.println(F("-1"));
      }
      else
      {
         Serial.println(F(" $$$$$ error opening test.txt $$$$"));
      }
      newData = false;  // OK ready for more data
   }
}
 
void recvWithStartEndMarkers()
{
   static boolean recvInProgress = false;
   static byte ndx = 0;
   char startMarker = '@';//'<'
   char endMarker = '$'; //’>’
  char rc;

while (ssPort.available() > 0 && newData == false)
  //while (Serial.available() > 0 && newData == false)
  {
      
      rc = ssPort.read();
     //rc = Serial.read();
     
if (recvInProgress == true)
     {
        if (rc != endMarker)
        {
           receivedChars[ndx] = rc;
           ndx++;
           if (ndx >= numChars)
           {
              ndx = numChars - 1;
           }
        }
        else
        {
           //receivedChars[ndx] = ‘\0’; // terminate the string
           //receivedChars[ndx] = ‘\0’;
           recvInProgress = false;
           ndx = 0;
           //delay(500);
           newData = true;
        }
     }
     else if (rc == startMarker)
     {
        //delay(500);
        recvInProgress = true;
     }
  }
}

void initSD()
{
  if (!SD.begin(csSD))
  {
  Serial.println("############ initialization failed! ########");
     while (1);
  }
  Serial.println("############ initialization done! ########");
 }

The text file which I want to send to sd card is as below
6,0805,1,w.wav,last bell
6,0805,2,r.wav,last bell
6,0805,3,p.wav,last bell
6,0805,4,p.wav,last bell
6,0805,5,p.wav,last bell
6,0805,1,w.wav,last bell
6,0805,2,r.wav,last bell
6,0805,3,p.wav,last bell
6,0805,4,p.wav,last bell
6,0805,5,p.wav,last bell
-1
but result is 
############ initialization done! ########
starting test data reception
6,0805,1,w.wav,last bell
6,0805,1,w.wav,last bell
6,0805,1@6,0805,1,w.wav,last belB 
6,0805,1,w.wav,last belllast belB 
6,0805,1,w.wav,last belllast belB 
6,0805,.wav,last bellelllast belB 
6,0805,1,wv,last bellelllast belB 
6,0805,1,w.wav,last bell@6,0805lB 
6,0805,1,w.wav,last bell@6,0805lB 
6,0805,1,w.wav,last bell@6,0805lB 
6,0805,.wav,last bellell@6,0805lB 
6,0805,1,w6,0805,1,w.wav,last blB 

the android app is developed in Mit App Inventor 2


![mit2|689x418](upload://hbZxURrahkle3oDal1Rs27BcVDb.png)

Please resolve the issue so that data may be send properly to sd card without corruption of data`Preformatted text`

@i4infotech, your topic was moved to a more suitable location on the foum.

Please edit your post, select all code and click </> to apply code tags to your code. Next save the post again.

First quesdtion is why you use SoftwareSerial on the hardware serial port.

Then what should I use? Please guide me

Some other pins that you don't use; e.g.

SoftwareSerial ssPort(2,3);

And hook your bluetooth module up to pins 2 and 3.