Size of a sketch

[lesept]

Hello
I'm playing with the Wifi and BLE connexions of the ESP32. I use the BLE libraries from Neil Kolban.
I built a sketch that receives data from an Android app I developed using App Inventor and it works. I wanted to add the possibility to connect on my Wifi network to get the current time, using a sketch which works also on its own.
When joining both sketches, the IDE says that the size is 123% of the available memory, although there are less than or around 50 code lines at all. I had to change the memory option of the Arduino IDE to no OTA to be able to upload it.

Do you know why I had this problem? Is it coming from the libraries used which are too heavy? Can anyone suggest other libraries for BLE and Wifi that are lighter?

The other problem I ran into (but I knew it would be such) is that when I want to connect to the Wifi, it forces the BLE to disconnect. Is there a way to disconnect BLE before connecting to the Wifi and auto-reconnect the BLE after disconnecting from the Wifi, without any action on the Android app side?

[lesept]

Actually, it's 180 lines...

Code: Select all

/*
    Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleWrite.cpp
    Ported to Arduino ESP32 by Evandro Copercini
*/
#include <WiFi.h>
#include "time.h"

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>

// See the following for generating UUIDs:
// https://www.uuidgenerator.net/

#define SERVICE_UUID        "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"

const char* ssid       = "Lesept";
const char* password   = "LeAnaisJuju030198";

const char* ntpServer = "de.pool.ntp.org";
const long  gmtOffset_sec = 3600;
const int   daylightOffset_sec = 3600;
struct tm timeinfo;
byte n = 0;
/*
  struct tm
  {
  int    tm_sec;   //   Seconds [0,60].
  int    tm_min;   //   Minutes [0,59].
  int    tm_hour;  //   Hour [0,23].
  int    tm_mday;  //   Day of month [1,31].
  int    tm_mon;   //   Month of year [0,11].
  int    tm_year;  //   Years since 1900.
  int    tm_wday;  //   Day of week [0,6] (Sunday =0).
  int    tm_yday;  //   Day of year [0,365].
  int    tm_isdst; //   Daylight Savings flag.
  }
*/



class MyCallbacks: public BLECharacteristicCallbacks {
    void onWrite(BLECharacteristic *pCharacteristic) {
      std::string value = pCharacteristic->getValue();

      char carac;
      if (value.length() > 0) {
        Serial.print("New value: ");
        for (int i = 0; i < value.length(); i++) Serial.print(value[i]);
        Serial.print (" : ");
        carac = value[0];
        switch (carac) {
          case 'N':
            Serial.println("Minutes ON");
            break;
          case 'F':
            Serial.println("Minutes OFF");
            break;
          case 'O':
            Serial.println("Fond ON");
            break;
          case 'E':
            Serial.println("Fond OFF");
            break;
          case 'U':
            {
              Serial.println("Couleur");
              byte red = 0;
              int i = 1;
              while (value[i] != ',') {
                red = red * 10 + value[i] - '0';
                i++;
              }
              Serial.print (red);
              Serial.print (" - ");
              i++;
              byte green = 0;
              while (value[i] != ',') {
                green = green * 10 + value[i] - '0';
                i++;
              }
              Serial.print (green);
              Serial.print (" - ");
              i++;
              byte blue = 0;
              while (value[i] != '*') {
                blue = blue * 10 + value[i] - '0';
                i++;
              }
              Serial.println (blue);
              break;
            }
          case 'A':
            {
              Serial.print("Animation ");
              int numAnim = 0;
              int i = 1;
              while (value[i] != '*') {
                numAnim = numAnim * 10 + value[i] - '0';
                i++;
              }
              Serial.println(numAnim);
              break;
            }
          case 'P':
            {
              Serial.print("Palette ");
              int numPal = 0;
              int i = 1;
              while (value[i] != '*') {
                numPal = numPal * 10 + value[i] - '0';
                i++;
              }
              Serial.println(numPal);
              break;
            }
        }
        Serial.println();
      }
    }
};

void printLocalTime()
{
  getLocalTime(&timeinfo);
  Serial.println(&timeinfo, "%A, %d %B %Y %H:%M:%S");
}

void WifiGetTime () {
  //connect to WiFi
  Serial.printf("Connecting to %s ", ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" CONNECTED");
  //init and get the time
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  printLocalTime();
  //disconnect WiFi as it's no longer needed
  WiFi.disconnect(true);
  WiFi.mode(WIFI_OFF);
}

void BLEStart () {
  Serial.println("Please connect Bluetooth LE device");
  BLEDevice::init("MyESP32");
  BLEServer *pServer = BLEDevice::createServer();
  BLEService *pService = pServer->createService(SERVICE_UUID);
  BLECharacteristic *pCharacteristic = pService->createCharacteristic(
                                         CHARACTERISTIC_UUID,
                                         BLECharacteristic::PROPERTY_READ |
                                         BLECharacteristic::PROPERTY_WRITE
                                       );
  pCharacteristic->setCallbacks(new MyCallbacks());
  pCharacteristic->setValue("Horloge Infinie (Lesept)");
  pService->start();
  BLEAdvertising *pAdvertising = pServer->getAdvertising();
  pAdvertising->start();
}


void setup() {
  Serial.begin(115200);
  WifiGetTime ();
  BLEStart ();
}

void loop() {
  delay(1000);
  printLocalTime();
  n++;
  if (n == 60) {
    Serial.println(F("Connecting to Wifi to get accurate time"));
    WifiGetTime ();
    n = 0;
  }
}

How can I reduce the size?

[richteel]

Lesept, it looks like you never received an answer to your question. The problem with the size is simply the size of the code in the include files for the libraries. I have just started working with this library and I am finding that with only the setup coded to initialize BLE, 90% of the programming memory is used. I plan to remove include statements to see if I can do without some of them or I'll look for another library. The one that Neil Kolban wrote is great but it too large. If I see ways to trim or refactor the code, I may fork Neil's code and submit a pull request. I'm trying to work several projects at the moment so trying to refactor working code is near the bottom of the list.