Basic chat program between Arduino Serial Monitor & connected Bluetooth Terminal. Switch baud rate for AT mode.

BluetoothVerify.ino

/* 
HC05 - Bluetooth Verifier
modified on 10 Feb 2019 
by Saeed Hosseini 
https://electropeak.com/learn/guides

Notes:
 - when using Serial monitor, the "Both NL & CR" newline must be set
 - BlE does AT FIRMWARE responses at baud rate 38400, reflected in code
 - BLE does respond via AT to most commands, but to use AT+NAME?, you must hold power/reset button on ble module while pressing enter
 - AT+ROLE -> 0 is slave, 1 is master
 - AT commands:
AT -> OK
AT+RESET
AT+VERSION
AT+ADDR
AT+NAME *press reset key here*
AT+NAME=yourname

``` captured April 17th, 2020
***AT commands mode***
OK
OK
+VERSION:2.0-20100601
OK
+ADDR:98d3:31:70727e
OK
+ADDR:98d3:31:70727e
OK
OK
OK
+ADDR:98d3:31:70727e
OK
OK
ERROR:(1A)
+UART:9600,0,0
OK
+NAME:SHAHBLE
OK
+ROLE:0
OK
+PSWD:1234
OK
+UART:9600,0,0
OK
```
*/ 
#include "SoftwareSerial.h"
SoftwareSerial MyBlue(3, 4); // RX | TX 
void setup() 
{ 
 Serial.begin(9600);
 MyBlue.begin(9600);  //Baud Rate for AT-command Mode: 38400
 Serial.println("***AT commands mode***");
} 
void loop() 
{ 
 //from bluetooth to Terminal. 
 if (MyBlue.available()) 
   Serial.write(MyBlue.read()); 
 //from termial to bluetooth 
 if (Serial.available()) 
   MyBlue.write(Serial.read());
}