Arduino Uno R4 WiFi with Bluetooth Classic

Official Hardware UNO Family UNO R4 WiFi
1

I'm trying to connect HC-06 Bluetooth Classic Module to R4 WiFi.
This is the code I'm using.

#include <SoftwareSerial.h>

SoftwareSerial BTSerial(2, 3);
boolean NewLine = true;

void setup() {
  Serial.begin(9600);
  while (!Serial) ;
  BTSerial.begin(9600);
}

void loop() {
  if (Serial.available()) {	
    char ch = Serial.read();

    if (ch != '\r' && ch != '\n') {
      BTSerial.write(ch);
    }
    if (NewLine) {
      Serial.print("\n> ");
      NewLine = false;
    }
    if (ch == '\n') {
      NewLine = true;
    }
    Serial.write(ch);
  }

  if (BTSerial.available()) {
    char ch = BTSerial.read();
    Serial.write(ch);
  }
}

After uploading the code, I cannot get 'OK' when type in 'AT'.
I can get 'OK' with R4 Minima. :roll_eyes:
Same code, same Bluetooth classic module, same wiring...

What is the difference between R4 WiFi and R4 Minima?
Did I miss something?

Another interesting thing is that
when I connected the module to Serial1,
I can get 'OK' with R4 WiFi.
Some bug in SoftwareSerial for R4 WiFi ?

Any hint for this?
Thank you in advance.

3

Interestingly, this minimal code works both for R4 WiFi and R4 Minima.

#include <SoftwareSerial.h>

SoftwareSerial BTSerial(2, 3);

void setup() {
  Serial.begin(9600); 
  BTSerial.begin(9600);
}

void loop() {
  if (BTSerial.available())
    Serial.write(BTSerial.read());

  if (Serial.available())
    BTSerial.write(Serial.read());
}

Any idea for this?

4

The Arduino Uno R4 WiFi, has a bluetooth capabilities, why you are trying to connect an external Bluetooth connection.?