at_command_sim7600_en_reg

#define RXD2 26
#define TXD2 27

#define PKEY 14
#define RST 12

#define pin_en 13

#define SerialMon Serial
#define SerialAT Serial2

int ledState = LOW;
const int ledPin =  15;
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, SERIAL_8N1, RXD2, TXD2);
  delay(250);
  SerialMon.println("test at mulai");
  pinMode(ledPin, OUTPUT);
  pinMode(RST, OUTPUT);
  pinMode(PKEY, OUTPUT);
  pinMode(pin_en, 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();
  wRespon(5000);
  if(res_cmd("AT","OK",5000)){
    Serial.println("sim7600 on");
  }else{
    Serial.println("sim7600 nok");
    digitalWrite(pin_en,HIGH);delay(1000);
    digitalWrite(pin_en,LOW); delay(1000);
    ESP.restart();
  }



  //bool res = modem.sendSMS("082165062273", "bismillaah, ini dari saya,monitoring smart farming , testing ya");
  //DBG("SMS:", res ? "OK" : "fail");
  /*SerialAT.println("AT");
    wRespon(1000);
    SerialAT.println("AT+IPREX?");
    wRespon(1000);
    SerialAT.println("AT+IPREX=115200");
    wRespon(1000);
    SerialAT.println("AT&W");
    wRespon(1000);22,21m
    SerialAT.begin(115200, SERIAL_8N1, RXD2, TXD2);
  */
}

void loop() {
  // put your main code here, to run repeatedly:
  SerialMon.println("SEND AT");

  cur_time_led = millis();
  if (cur_time_led - old_time_led >= 1000) {
    counter++;
    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("ATI");
        break;
      case 5:
        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;
}