ini_setup_function

void setup()
{
  Screen.init();
  Screen.print(0, "IoT Device Demo");
  Screen.print(2, "Initializing...");

  Screen.print(3, " > Serial");
  Serial.begin(115200);

  // Initialize the WiFi module
  Screen.print(3, " > WiFi");
  hasWifi = false;
  initWifi();
  if (!hasWifi)
  {
    return;
  }

  Screen.print(3, " > Sensors");
  sensorInit();

  Screen.print(3, " > IoT Hub");
  DevKitMQTTClient_Init(true);
  DevKitMQTTClient_SetOption(OPTION_MINI_SOLUTION_NAME, "mlIoTPlatformDevice");
  DevKitMQTTClient_SetSendConfirmationCallback(sendConfirmationCallback);
  DevKitMQTTClient_SetMessageCallback(messageCallback);
  DevKitMQTTClient_SetDeviceTwinCallback(deviceTwinCallback);
  DevKitMQTTClient_SetDeviceMethodCallback(deviceMethodCallback);

  appstate = APPSTATE_Init;
  Serial.begin(115200);

  int filter_size = mfcc_GetInputSize(0);
  if (filter_size != FEATURIZER_INPUT_SIZE)
  {
    Serial.printf("Featurizer input size %d is not equal to %d\n", filter_size, FEATURIZER_INPUT_SIZE);
    show_error("Featurizer Error");
  }

  if (appstate != APPSTATE_Error)
  {
    ::memset(featurizer_input_buffers[0], 0, FEATURIZER_INPUT_SIZE);

    // give it a whirl !!
    mfcc_Filter(nullptr, featurizer_input_buffers[0], featurizer_output_buffer);

    // check audio gain and print the result.
    uint32_t id = Audio.readRegister(nau88c10_CHIPID_ADDR);
    if (id == NAU88C10_ID)
    {
      Serial.printf("Found audio device: NAU88C10\r\n");
    }
    else
    {
      Serial.printf("Found audio device: 0x%x\r\n", id);
    }

    // a default gain level of 4 seems to work pretty well.
    start_recording();

    Screen.clean();

    Screen.print(0, "Listening...");
    Screen.print(1, "A = min gain");
    Screen.print(2, "B = max gain");

    minGain = 0;
    maxGain = 7;

    set_gain();
    display_gain();
  }

  send_interval_ms = SystemTickCounterRead();
}