at_command_sim800c

#define RXD2 26
#define TXD2 25

#define PKEY 7
unsigned long cur_time, old_time;

bool hold = 0;

int baud_rate[] = {1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800};

#define TINY_GSM_MODEM_SIM800
#define SerialMon Serial
#define SerialAT Serial3

#if !defined(TINY_GSM_RX_BUFFER)
#define TINY_GSM_RX_BUFFER 650
#endif
#define TINY_GSM_DEBUG SerialMon
#define GSM_PIN ""

// Your GPRS credentials, if any
const char apn[]      = "Internet";
const char gprsUser[] = "";
const char gprsPass[] = "";

// Server details
const char _server[]   = "iotles.com";
const char resource[] = "/TinyGSM/logo.txt";
const int  port       = 80;

#include <TinyGsmClient.h>
#include <ArduinoHttpClient.h>

#ifdef DUMP_AT_COMMANDS
#include <StreamDebugger.h>
StreamDebugger debugger(SerialAT, SerialMon);
TinyGsm        modem(debugger);
#else
TinyGsm        modem(SerialAT);
#endif

TinyGsmClient client(modem);
HttpClient    http(client, _server, port);


void setup() {
  // put your setup code here, to run once:
  delay(1000);
  SerialMon.begin(115200);
  SerialAT.begin(9600);
  delay(1000);
  Serial.println("test at mulai");
  pinMode(PKEY, OUTPUT);
  pinMode(27, OUTPUT);
  digitalWrite(PKEY, HIGH);
  digitalWrite(27, HIGH);

  delay(1100);

  digitalWrite(PKEY, LOW);
  delay(1100);
  digitalWrite(PKEY, HIGH);

  String modemInfo = modem.getModemInfo();
  SerialMon.print("Modem Info: ");
  SerialMon.println(modemInfo);
  delay(1000);

  //change_baud();
  /*
    while (1) {

    for (int i = 0; i < 10; i++) {
      Serial.print(i);Serial.print(",");
      Serial.println(baud_rate[i]);

      SerialAT.begin(baud_rate[i], SERIAL_8N1, RXD2, TXD2);
      delay(500);
      send_at("AT+IPR?");
      delay(500);
    }
    }
  */
}

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


  send_at("AT+GSN");
  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");

  while (1) {
    send_at("AT");
    send_at("AT+IPR?");
    //send_at("AT&V");
    delay(1000);
    send_at("AT+COPS?");
    digitalWrite(27, LOW);
    send_at("AT+CSQ");
    digitalWrite(27, HIGH);
    send_at("AT+GSN");
    digitalWrite(27, HIGH);
  }
}

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());
    }
  }
}