reading from XS-3868

Using Arduino Audio
1

hello
Im trying to intercept message from bluetooth module XS-3868 that someething was connected to it
bul all I receive from it through serial is some strange chars.
I was trying to set different speed for serial in my program but it did not help
my code is

int incomingByte = 0; 
void setup() {
Serial.begin(115200); 
}
void loop() {
     if (Serial.available() > 0) {
        Serial.print(" I received:");
        Serial.println(Serial.readString());
    }
}

and what i receiving is:

 I received:
MR
?
 I received:
?M?H?
 I received:
?J?
?
 I received:
?M?H
 I received:
?MR

 I received:
?J?
?
 I received:
?MR
?
 I received:
M?H?

Any clues what shoul I change to receive proper responses from my bluetooth deveice?
Thanks in advance for any help

2

If you are using an Arduino Uno, or Nano, try connecting the module into software serial pins. If you are using an Arduino Mega, connect it in another serial port (different from the pins 0 and 1).