Arduino not connecting to wifi automatically

Using Arduino Project Guidance
#1 
#include <SoftwareSerial.h>
#include <Arduino.h>
SoftwareSerial mySerial(2,3); // RX, TX

void setup()
{
  pinMode(9,OUTPUT);
  delay(10);
 Serial.begin(9600);
 delay(10);
  mySerial.begin(115200);
  delay(1000);
  while(mySerial.available())
  {  
   mySerial.println('AT+CWMODE=1');
   delay(1000);
   mySerial.println('AT+CWLAP');
   delay(1000);
   mySerial.println('AT+CIPMUX=1');
   delay(1000);
  mySerial.println('AT+CWJAP="Swaraj_WLAN","internet"');
  delay(1000);
  mySerial.println('AT+CIPSERVER=1,4444');
  delay(1000);
  mySerial.println('AT+CIFSR');
  }
}

void loop() 
{ 
 if (mySerial.available()) 
 {
  String a;
  a=mySerial.readString();
  Serial.println(a);
  char b[15];
  a.toCharArray(b,15);
  Serial.println(b[9]);
  if(b[11]=='o'&&b[12]=='n')
  {
    Serial.print("This segment ram!");
    pinMode(9,OUTPUT);
    digitalWrite(9,HIGH);
  }
  if(b[11]=='o'&&b[12]=='f'&&b[13]=='f')
  {
    Serial.print("This 2 segment ram!");
    digitalWrite(9,LOW);
  }
   
 }

    if(Serial.available())
    {
      mySerial.write(Serial.read());
    }
}


/*void Check_Protocol(char inStr[])
{   
 Serial.print("Command: ");
 Serial.print(inStr);
 Serial.println("-");     
 Serial.println("Check_Protocol");
 if(inStr[0]=='o'&&inStr[1]=='n')
 {
 Serial.println("on");
 digitalWrite(9, HIGH);
 }

  if(inStr[0]=='o'&&inStr[1]=='f'&&inStr[2]=='f')
 {
 Serial.println("on");
 digitalWrite(9, HIGH);
 }
}*/

The above code worked like a charm for the first time.But the next day i was surprised it was not working.I reuploaded some other code ,and then reuploaded this same code in arduino.Later after experimenting I found out that , i need to manually enter the commands “AT+CWLAP”,“AT+CIPMUX=1” etc then after even if I close the arduino ide and the console it works.

But, if i unplug the usb cable used to power the arduino and plug it again it is not connecting to wifi.

#2

the readString() call does not have any warranty it reads exact lines, so exact positioning "on" "off" sequences on input string can easily get screwed up.

There-s somewhere here an example on the forum on how to properly use serial input.

You might need a readStringUntil() to detect input line boundaries.

#3

The readstring is converted to character array , and that works .
But if i unplug the usb and replug it again it doesnt work until i type the wifi code in console.How to make it work without pc?

#4