blynk_watchdog

#define RXD2 26
#define TXD2 27

#define PKEY 14
#define RST 12

#define TINY_GSM_MODEM_SIM7600
#define BLYNK_TEMPLATE_ID "TMPLE1aPZJfE"
#define BLYNK_TEMPLATE_NAME "Solar_Tracker"
#define BLYNK_AUTH_TOKEN "aoZ95-IDwV16oVP3N9TChD36QmmPWMRz"

#define BLYNK_PRINT Serial
#define SerialMon Serial
#define SerialAT Serial2
#include <TinyGsmClient.h>
#include <BlynkSimpleTinyGSM.h>
TinyGsm modem(SerialAT);

unsigned long cur_time_res, old_time_res;
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
char apn[]  = "Internet";
char user[] = "";
char pass[] = "";

int counter = 0;
int count_con = 0;

#define WATCHDOG_TIMEOUT_S 20 // restart jika tidak ada respon 5detik
hw_timer_t * watchDogTimer = NULL;

void IRAM_ATTR watchDogInterrupt() {
  Serial.println("reboot");
  ESP.restart();
}

void watchDogRefresh()
{
  timerWrite(watchDogTimer, 0);                    //reset timer (feed watchdog)
}

void setup() {
  // put your setup code here, to run once:

  delay(100);
  Serial.begin(115200);
  SerialAT.begin(115200, SERIAL_8N1, RXD2, TXD2);

  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();
  Serial.print("Modem Info: ");
  Serial.println(modemInfo);

  Blynk.begin(BLYNK_AUTH_TOKEN, modem, apn, user, pass);
  delay(100);

}

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

  cur_time_res = millis();
  if (cur_time_res - old_time_res >= 1000) {
    watchDogRefresh();

    old_time_res = millis();
  }



  cur_time = millis();
  if (cur_time - old_time >= 4000) {
    //baca_pzem();
    Blynk.virtualWrite(V3, counter);
    counter ++;
    if (counter == 1500) {
      counter = 0;
    }
    bool check_con = Blynk.connected();
    Serial.print("connected: " );
    Serial.println(check_con);
    if (check_con == false) {
      count_con++;
      if (count_con == 20) {
        Serial.print("disconnect: ");
        Serial.println(count_con);
        reset_sim();
        wakeup_sim();
      }
    }
    old_time = millis();
  }
}

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);
}

void wRespon(long waktu) {
  cur_time_res = millis();
  old_time_res = cur_time_res;
  while (cur_time_res - old_time_res < waktu ) {
    cur_time_res = millis();
    while (SerialAT.available() > 0) {
      SerialMon.print(SerialAT.readString());
    }
  }
}