telegram_bot_sim7600

// my whatsapp: +6282165062273
//tutorial get chat id group: https://stackoverflow.com/questions/32423837/telegram-bot-how-to-get-a-group-chat-id


#define TINY_GSM_MODEM_SIM7600

#if !defined(TINY_GSM_RX_BUFFER)
#define TINY_GSM_RX_BUFFER 650
#endif
#define TINY_GSM_DEBUG SerialMon
#define GSM_PIN ""
#define SerialMon Serial
#define SerialAT Serial2

#include <TinyGsmClient.h>
TinyGsm modem(SerialAT);

#define RXD2 26
#define TXD2 27

#define PKEY 14
#define RST 12
byte pin_led = 13;
byte pin_wdt = 19;
bool ledState = 0;

char apn[] = "Internet";
char gprsUser[] = "";
char gprsPass[] = "";

unsigned long cur_time_at, old_time_at ;

String str_token = "6959418433:BBES5hhzLL-OVX53DKBYBRbvHjl9OEGXKeU"; // token bot telegram
String str_chat_id = "-4056201879"; // chat id group telegram

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  SerialAT.begin(115200, SERIAL_8N1, RXD2, TXD2);
  pinMode(pin_wdt, OUTPUT);
  pinMode(pin_led, OUTPUT);
  pinMode(RST, OUTPUT);
  pinMode(PKEY, OUTPUT);
  delay(1000);

  Serial.println("reset sim");
  rst_sim();
  Serial.println("list cert");
  send_at("AT+CCERTLIST");

}

void loop() {
  ledState = !ledState;
  digitalWrite(pin_led, ledState);
  digitalWrite(pin_wdt, ledState);
  push_telegram(str_token, str_chat_id, "dariSim7600");
  delay(3000);
}

void push_telegram(String _token, String _chat_id, String _txt_message) {
  if (koneksi()) {
    Serial.println("gsm ok");
    String _url = "GET /bot" + _token + "/sendMessage?";
    _url += "chat_id=" + _chat_id + "&text=" + _txt_message + " HTTP/1.1";
    _url += "\r\n";
    _url += "Host: api.telegram.org\r\n";
    _url += "Content-Type: text/plain\r\n";
    _url += "\r\n";
    Serial.print("url: ");
    Serial.println(_url);

    res_cmd("AT+CSSLCFG=\"sslversion\",0,4", "OK", 1000); Serial.println("1");
    res_cmd("AT+CSSLCFG=\"authmode\",0,1", "OK", 1000); Serial.println("2");
    res_cmd("AT+CSSLCFG=\"cacert\",0,\"ca_cert.pem\"", "OK", 1000); Serial.println("3");
    res_cmd("AT+CCHSET=1", "OK", 1000); Serial.println("4");
    res_cmd("AT+CCHSTART", "OK", 1000); Serial.println("5");
    res_cmd("AT+CCHSSLCFG=0,0", "OK", 1000); Serial.println("6");
    res_cmd("AT+CCHOPEN=0,\"api.telegram.org\",443,2", "+CCHOPEN: 0,0", 30000);
    char buf_at[40];
    String str_at = "";
    str_at = "AT+CCHSEND=0," + String(_url.length());
    str_at.toCharArray(buf_at, str_at.length() + 1);
    send_at(buf_at);
    SerialAT.println(_url);
    wRespon(5000);
    res_cmd("AT+CCHCLOSE=0", "OK", 1000);
    res_cmd("AT+CCHSTOP", "OK", 1000);
  }
  else {
    Serial.println("gsm not ok");
  }
}



bool koneksi() {
  bool sts_koneksi;
  SerialMon.print(F("Waiting for network..."));
  int i = 0;
  while (!modem.waitForNetwork()) {
    SerialMon.println(" fail");
    delay(1000); i++;
    if (i == 1)break;
  }
  i = 0;
  SerialMon.println(F(" success"));
  while (!modem.isNetworkConnected()) {
    SerialMon.println(F("Network fail"));
    delay(1000); i++;
    if (i == 1)break;
  }
  SerialMon.println(F("Network connected"));

  i = 0;
  // GPRS connection parameters are usually set after network registration

  SerialMon.print(F("Connecting to "));
  SerialMon.print(apn);
  while (!modem.gprsConnect(apn, gprsUser, gprsPass)) {
    SerialMon.println(" fail");
    delay(1000); i++;
    if (i == 1)break;
  }

  i = 0;
  SerialMon.println(F(" success"));
  if (modem.isGprsConnected()) {
    SerialMon.println(F("GPRS connected"));
    sts_koneksi = true;
  } else {
    sts_koneksi = false;
  }
  Serial.print("status koneksi: ");
  Serial.println(sts_koneksi);
  return sts_koneksi;
}

void send_at(char *_command) {
  SerialAT.println(_command);
  wRespon(500);
}

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

void rst_sim() {
  digitalWrite(PKEY, LOW);
  digitalWrite(RST, LOW);
  delay(1000);
  digitalWrite(PKEY, HIGH);
  digitalWrite(RST, HIGH);
  delay(1000);
  digitalWrite(PKEY, LOW);
  digitalWrite(RST, LOW);
  Serial.println("Initializing modem...");
  modem.restart();
  String modemInfo = modem.getModemInfo();
  Serial.print("Modem Info: ");
  Serial.println(modemInfo);
}

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;
}