JDY-30 bluetooth Module Example

AT_config_BT.ino

#include <SoftwareSerial.h>
SoftwareSerial mySerial(3, 4); // RX, TX


void setup() {
  // put your setup code here, to run once:
  mySerial.begin(9600);
  Serial.begin(9600);
   pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);
  sendCommand("AT");
  //sendCommand("AT+HELP");
  //sendCommand("AT+ROLE0");
  sendCommand("AT+NAMEgisbluetooh");
}

void sendCommand(const char * command){
  
  Serial.print("Command send :");
  Serial.println(command);
 
  mySerial.println(command);
  //wait some time
  delay(100);
  
  char reply[50];
  int i = 0;
 
  while (mySerial.available()) {
    reply[i] = mySerial.read();
    i += 1;
  }
  //end the string
  reply[i] = '\0';
  Serial.print(reply);
  Serial.println("Reply end");
}

void readSerial(){
  char reply[50];
  int i = 0;
  while (mySerial.available()) {
    reply[i] = mySerial.read();
    i += 1;
  }
  //end the string
  reply[i] = '\0';
  
  if(strlen(reply) > 0){
    Serial.println(reply);
    Serial.println("We have just read some data");
  int state=reply[0];
     if (state == '0') {
  digitalWrite(LED_BUILTIN, LOW); // Turn LED OFF
  Serial.println("LED: OFF"); // Send back, to the phone, the String "LED: ON"
  state = 0;
 }
 else if (state == '1') {
  digitalWrite(LED_BUILTIN, HIGH);
  Serial.println("LED: ON");
  state = 0;
 } 
  }
}

void loop() {
  
  char reply[50];
  int i = 0;
  if (Serial.available()){
  while (Serial.available()) {
    reply[i] = Serial.read();
    i += 1;
  }
  
  //end the string
  reply[i] = '\0';
   sendCommand(reply);
   
  }
  readSerial();
  delay(500);
}