#include <SoftwareSerial.h>

#define buttonPin 2
#define ledPin 3

SoftwareSerial mySerial(0, 1); // RX, TX
int bState;
void setup() {
  // put your setup code here, to run once:

   mySerial.begin(115200);

   pinMode(buttonPin, INPUT_PULLUP);
   pinMode(ledPin, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:

    if (mySerial.available()) {
    char in = mySerial.read();
    if (in == 'l') digitalWrite(3, LOW);
    if (in == 'L') digitalWrite(3, HIGH);
  }
int newBstate = digitalRead (2);
if (bState != newBstate) {
  bState = newBstate;
  if (bState) mySerial.print('b');
  else mySerial.print('B');

  }
  delay(10);
  }