void setupModule() {
    // Wait until the module is ready to accept AT commands
  while(!sim800l->isReady()) {
    Serial.println(F("Problem to initialize AT command, retry in 1 sec"));
    delay(1000);
  }
  Serial.println(F("Setup Complete!"));

  // Wait for the GSM signal
  uint8_t signal = sim800l->getSignal();
  while(signal <= 0) {
    delay(1000);
    signal = sim800l->getSignal();
  }
  Serial.print(F("Signal OK (strenght: "));
  Serial.print(signal);
  Serial.println(F(")"));
  delay(1000);

  // Wait for operator network registration (national or roaming network)
  NetworkRegistration network = sim800l->getRegistrationStatus();
  while(network != REGISTERED_HOME && network != REGISTERED_ROAMING) {
    delay(1000);
    network = sim800l->getRegistrationStatus();
  }
  Serial.println(F("Network registration OK"));
  delay(1000);

  // Setup APN for GPRS configuration
  bool success = sim800l->setupGPRS(APN);
  while(!success) {
    success = sim800l->setupGPRS(APN);
    delay(5000);
  }
  Serial.println(F("GPRS config OK"));
}