#include <SoftwareSerial.h>

int bluetoothTx = 2;
int bluetoothRx = 3;

SofwareSerial bluetooth(bluetoothTx, bluetoothRx);

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

  bluetooth.begin(115200);
  bluetooth.print("$");
  bluetooth.print("$");
  bluetooth.print("$");
  delay(100);
  bluetooth.println("u,9600,N");

  bluetooth.begin(9600);
}

void loop(){
  if bluetooth.available()){
    Serial.print((char)bluetooth.read());
  }
  if(Serial.available()){
    bluetooth.print((char)Serial.read());
  }
}