Problems sending information between 2 HM-10 at 19200baud

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1

Hello there,
I'm working on a project in which I need to connect 2 Arduino cards using Bluetooth. I therefore bought 2 HM-10 modules.
I need the information to be transfered with a 19200 baud rate, but I encounter problems doing that.
First of all, I need the information to be transfered with no delay, but the terminal doesn't seem to be okay and sends me back either nothing, or interrogation points.
When I put delays, information is sent. But the other card receives and prints weird infos.
Here is the code :

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10,11); //RX,TX

void setup() {

  Serial.begin(19200); //launching the Serial on 19200
  mySerial.begin(9600); //launching the HM-10 on its native mode, 9600baud
  mySerial.write("AT+BAUD?"); //making sure of what's the actual baud rate
  delay(20);
  mySerial.write("AT+BAUD1"); //change the baud rate to 19200
  delay(20);
  mySerial.write("AT+ROLE1"); //changing the role to master
  delay(20);
  mySerial.write("AT+ADDR?"); //finds the address (we don't always know which controller is master) and connects
  delay(100);
  if(mySerial.read()=="34151387DE12"){ 
    delay(100);
    mySerial.write("AT+CON341513E640BF");
    delay(100);
  }
  else{
    delay(100);
    mySerial.write("AT+CON34151387DE12");
    delay(100);
  }
  Serial.write(mySerial.read()); //prints on the terminal what has been sent back
  delay(20);

}

//at this point the 2 cards are connected and should be ready to work, the other in slave mode doesn't have the connection part but has roughly the same code

void loop() {


  mySerial.write('1'); //sends 1 on the HM-10
  Serial.write('1'); //sends 1 on the terminal
  delay(1000);

  if(mySerial.available()) {
    Serial.write(mySerial.read()); //permits seeing what has been sent to the card
    
  }
  
  if(Serial.available()) 
    mySerial.write(Serial.read()); //permits sending the 1 from the terminal to the HM-10 (double checking)
    
}
}

Anyone has an idea ?

2 
  if(mySerial.read()=="34151387DE12"){

The read() method returns an int, with the data in the low order byte and the error in the sign bit. That low order byte will NEVER equal that string literal.

  mySerial.write("AT+BAUD1"); //change the baud rate to 19200
  delay(20);
  mySerial.write("AT+ROLE1"); //changing the role to master
  delay(20);
  mySerial.write("AT+ADDR?"); //finds the address (we don't always know which controller is master) and connects
  delay(100);

Change the baud rate, but continue writing and reading at the old rate. Hmmm.