test_at_command

#define SerialMon Serial
#define SerialAT Serial1

#define RXD2 26
#define TXD2 25

#define PKEY 14
unsigned long cur_time, old_time;

bool hold = 0;

void setup() {
  // put your setup code here, to run once:
  SerialMon.begin(115200);
  SerialAT.begin(115200, SERIAL_8N1, RXD2, TXD2);
  delay(1000);
  Serial.println("test at mulai");
  pinMode(PKEY, OUTPUT);
  pinMode(27, OUTPUT);
  digitalWrite(PKEY, HIGH);
  /*
  delay(1100);

  digitalWrite(PKEY, LOW);
  delay(1100);
  digitalWrite(PKEY, HIGH);
  */
  wRespon(15000);
  //change_baud();

}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("SEND AT");
  digitalWrite(27,HIGH);
  send_at("AT+IPR?");
  digitalWrite(27,LOW);
  send_at("AT+CPIN?");
  digitalWrite(27,HIGH);
  send_at("AT+COPS?");
  digitalWrite(27,LOW);
  send_at("AT+CSQ");
  digitalWrite(27,HIGH);
  send_at("AT+CREG?");
  digitalWrite(27,LOW);
}

void change_baud() {
  send_at("AT");
  send_at("AT+IPR=?");
  Serial.println("change baut rate");
  send_at("AT+IPR=9600");
  send_at("AT&W");
  SerialAT.begin(9600, SERIAL_8N1, RXD2, TXD2);
  while (1) {
    send_at("AT");
    send_at("AT+IPR?");
    //send_at("AT&V");
    delay(1000);
  }
}

void send_at(char *_command) {
  SerialAT.println(_command);
  wRespon(1000);
}

void wRespon(long waktu) {
  cur_time = millis();
  old_time = cur_time;
  while (cur_time - old_time < waktu ) {
    cur_time = millis();
    while (SerialAT.available() > 0) {
      Serial.print(SerialAT.readString());
    }
  }
}