Allow for additional services like logging

[dvv]

Example below:

#include <BleKeyboard.h>

class Myshonok : public BleKeyboard {
private:
  BLEService *pLogService;
  BLECharacteristic *pTxCharacteristic;
public:
  Myshonok(const char *deviceName, const char *manufacturer) : BleKeyboard(deviceName, manufacturer) {
  }
  template <typename T> void log(T x) {
    if (!isConnected()) return;
    auto s = String(x);
    pTxCharacteristic->setValue((uint8_t *)s.c_str(), s.length());
    pTxCharacteristic->notify();
  }
protected:
  void onStarted(BLEServer *pServer) override {
    pLogService = pServer->createService("6E400001-B5A3-F393-E0A9-E50E24DCCA9E");
    pTxCharacteristic = pLogService->createCharacteristic("6E400003-B5A3-F393-E0A9-E50E24DCCA9E", BLECharacteristic::PROPERTY_NOTIFY);
    pTxCharacteristic->addDescriptor(new BLE2902());
    pLogService->start();
  }
};

static Myshonok kbd("Myshonok", "x670cm69");

void setup() {
  kbd.begin();
}

void loop() {
  if (SMTH) {
    kbd.log("SMTH");
  }
}

Please consider applying
TIA

[T-vK]

Sure, why not. What systems have you tested this with? Would you mind creating another PR for https://github.com/T-vK/ESP32-BLE-Mouse and maybe also for https://github.com/lemmingDev/ESP32-BLE-Gamepad which is maintained by lemmingDev?

[dvv]

It runs on my esp32 devkit steer keys reader and controls an android phone.
Sure, asap.