Just use basic client-server architecture. Let’s say for example hc-06 module to be used as a client and by programming ESP32’s bluetooth to act as a server so as to establish communication

If you are asking about physical connection, H6-06 can be connected via UART.

Have u try setting up the ESP32 in Bluetooth Serial mode with `BluetoothSerial`

HC 06 uses **Bluetooth Classic**, so code it to handle pairing as a Bluetooth Serial device, not BLE. Once you ve gotten the ESP32 set as a server, make sure its discoverable and try pairing with AT commands from HC 06

If u want to directly use the `ESP32’s` built-in Bluetooth functionality, you can opt for `Classic Bluetooth` or `Bluetooth Low Energy` (BLE) depending on your project. `Classic Bluetooth` is great for continuous data exchange, while `BLE` is optimized for low-power, intermittent communication.

#include "BluetoothSerial.h"
#include 
#include 

BluetoothSerial ESP_BT;  // Classic Bluetooth object

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

  // Classic Bluetooth setup
  ESP_BT.begin("ESP32_BT_Device");  // Name the device
  Serial.println("Classic Bluetooth Device is Ready to Pair");

  // BLE setup
  BLEDevice::init("ESP32_BLE_Server");  // Name the BLE server
  BLEServer *pServer = BLEDevice::createServer();
  Serial.println("BLE Server is Running");
}

void loop() {
  // Handle Classic Bluetooth data
  if (ESP_BT.available()) {
    char received = ESP_BT.read();
    Serial.write(received);  // Echo received data
  }

  // BLE logic can be added here as needed for advanced configurations
}