ESP32 BLE Media Controller Code

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <BleKeyboard.h>
#include <WiFi.h>
#include <WebServer.h>
#include <esp_bt.h>

// WIFI
const char* ssid = "TD";
const char* password = "boom boom";

WebServer server(80);

// PINS =
#define CLK 18
#define DT  19
#define SW  23

// OLED
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// BLE
BleKeyboard bleKeyboard("ESP32 Controller", "Tanay", 100);

// STATE
int volume = 50;
bool isPlaying = false;

String track  = "No Track";
String artist = "No Artist";

// ENCODER
int lastCLK;
unsigned long lastConnectedTime = 0;

//  SETUP
void setup() {
  Serial.begin(115200);

  pinMode(CLK, INPUT_PULLUP);
  pinMode(DT, INPUT_PULLUP);
  pinMode(SW, INPUT_PULLUP);

  lastCLK = digitalRead(CLK);

  Wire.begin(21, 22);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("OLED FAIL");
    while (1);
  }

  display.clearDisplay();
  display.setTextColor(WHITE);

  bleKeyboard.begin();
  bleKeyboard.setDelay(0);

  // WIFI CONNECT
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nConnected!");
  Serial.println(WiFi.localIP());

  // HTTP ENDPOINT
  server.on("/update", []() {
    if (server.hasArg("track")) track = server.arg("track");
    if (server.hasArg("artist")) artist = server.arg("artist");

    Serial.println("Track: " + track);
    Serial.println("Artist: " + artist);

    server.send(200, "text/plain", "OK");
  });

  server.begin();
}

// LOOP
void loop() {

  server.handleClient();

  // BLE CONNECTION HANDLING
  static bool wasConnected = false;

  if (bleKeyboard.isConnected()) {
    if (!wasConnected) {
      Serial.println("BLE Connected");
      wasConnected = true;
    }
    lastConnectedTime = millis();

  } else {
    if (wasConnected) {
      Serial.println("BLE Disconnected → restarting BLE");
      wasConnected = false;

      delay(500);
      Serial.println("Resetting BLE stack...");

      // turn off bluetooth completely
      esp_bluedroid_disable();
      esp_bluedroid_deinit();
      esp_bt_controller_disable();

      // small delay
      delay(500);

      // restart clean
      ESP.restart();
    }

    delay(500);
    return;
  }

  handleEncoder();
  handleButton();
  drawUI();
}

// ENCODER
void handleEncoder() {
  static int lastStateCLK = HIGH;
  int currentStateCLK = digitalRead(CLK);

  if (currentStateCLK != lastStateCLK) {

    if (digitalRead(DT) != currentStateCLK) {
      volume = min(100, volume + 2);
      bleKeyboard.write(KEY_MEDIA_VOLUME_UP);
      Serial.println("VOL UP");
    } else {
      volume = max(0, volume - 2);
      bleKeyboard.write(KEY_MEDIA_VOLUME_DOWN);
      Serial.println("VOL DOWN");
    }

    delay(3); // debounce
  }

  lastStateCLK = currentStateCLK;
}

// BUTTON
void handleButton() {
  static unsigned long lastPress = 0;

  if (digitalRead(SW) == LOW && millis() - lastPress > 300) {
    lastPress = millis();

    isPlaying = !isPlaying;
    bleKeyboard.write(KEY_MEDIA_PLAY_PAUSE);

    Serial.println("PLAY/PAUSE");
  }
}

// UI
void drawUI() {
  display.clearDisplay();

  display.setTextSize(1);

  // HEADER
  display.setCursor(20, 0);
  display.print("Now Playing");

  // TRACK
  display.setCursor(0, 15);
  display.print(track);

  // ARTIST
  display.setCursor(0, 25);
  display.print(artist);

  // STATE
  display.setCursor(0, 35);
  display.print(isPlaying ? "Playing" : "Paused");

  // VOLUME BAR
  display.drawRect(0, 48, 128, 10, WHITE);
  int fill = map(volume, 0, 100, 0, 126);
  display.fillRect(1, 49, fill, 8, WHITE);

  display.display();
}