test_at_atmega2560

#define PKEY 7
#define RST 6

#define SerialMon Serial
#define SerialAT Serial3

int ledState = LOW;
const int ledPin =  12;
int counter = 0;

unsigned long cur_time_led, old_time_led;
unsigned long cur_time, old_time;
bool hold = 0;

#define TINY_GSM_MODEM_SIM7600
#if !defined(TINY_GSM_RX_BUFFER)
#define TINY_GSM_RX_BUFFER 650
#endif
#define TINY_GSM_DEBUG SerialMon
// set GSM PIN, if any
#define GSM_PIN ""

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

const char server[]   = "vsh.pp.ua";
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:
  SerialMon.begin(115200);
  SerialAT.begin(115200);
  delay(250);
  SerialMon.println("test at mulai");
  pinMode(ledPin, OUTPUT);
  pinMode(RST, OUTPUT);
  pinMode(PKEY, OUTPUT);

  digitalWrite(PKEY, LOW);
  digitalWrite(RST, LOW);
  delay(1000);
  digitalWrite(PKEY, HIGH);
  digitalWrite(RST, HIGH);
  delay(1000);
  digitalWrite(PKEY, LOW);
  digitalWrite(RST, LOW);
  delay(1000);
  SerialMon.println("Initializing modem...");
  modem.restart();
  String modemInfo = modem.getModemInfo();
  SerialMon.print("Modem Info: ");
  SerialMon.println(modemInfo);
  delay(1000);
  /*
  send_at("AT+CMGF=1");
  send_at("AT+IPREX=9600");
  SerialAT.begin(9600, SERIAL_8N1, RXD2, TXD2);
  send_at("AT&W");
  send_at("AT&V");
  */
}

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

  cur_time_led = millis();
  if (cur_time_led - old_time_led >= 1000) {
    SerialMon.println("SEND AT");
    counter++;
    /*bool pin_sts =   res_cmd("AT+CPIN?", "+CPIN: READY", 1000);
    Serial.print("sts pin: ");
    Serial.println(pin_sts);
    if(pin_sts == 0){
      reset_sim();
      wakeup_sim();
    }
    */
    switch (counter) {
      case 1:
        send_at("AT+CPIN?");
        break;
      case 2:
        send_at("AT+CSQ");
        break;
      case 3:
        send_at("AT+CPSI?");
        break;
      case 4:
        send_at("AT+IPR?");
        counter = 0;
        break;
    }

    if (ledState == LOW) {
      ledState = HIGH;
    } else {
      ledState = LOW;
    }

    digitalWrite(ledPin, ledState);
    old_time_led = cur_time_led;
  }
}

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) {
      SerialMon.print(SerialAT.readString());
    }
  }
}


void reset_sim() {
  digitalWrite(RST, HIGH);
}

void wakeup_sim() {
  SerialMon.println("wakeup sim7600");
  digitalWrite(PKEY, LOW);
  digitalWrite(RST, LOW);
  delay(1000);
  digitalWrite(PKEY, HIGH);
  digitalWrite(RST, HIGH);
  delay(1000);
  digitalWrite(PKEY, LOW);
  digitalWrite(RST, LOW);
  delay(1000);
  wRespon(15000);
}

int8_t res_cmd(char* ATcommand, char* expected_answer, unsigned int timeout) {
  uint8_t x = 0, answer = 0;
  char response[100];
  unsigned long prevMillis;
  memset(response, '\0', 100);
  delay(100);

  while (SerialAT.available() > 0)SerialAT.read();
  SerialAT.println(ATcommand);

  prevMillis = millis();

  do {
    if (SerialAT.available() != 0) {
      response[x] = SerialAT.read();
      x++;
      if (strstr(response, expected_answer) != NULL) {
        answer = 1;
      }
    }
  } while ((answer == 0) && ((millis() - prevMillis) < timeout));
  return answer;
}