BT code new Perplexity

#include "BluetoothSerial.h"

BluetoothSerial SerialBT;

const char* targetDeviceName = "HostDeviceName"; // Replace with the name of your host device
const char* pin = "1234"; // Replace with the correct PIN for pairing

void setup() {
  Serial.begin(115200);
  Serial.println("Starting ESP32 Bluetooth...");

  // Initialize Bluetooth as a client
  if (!SerialBT.begin("ESP32_Client", true)) { // Enable Secure Simple Pairing (SSP)
    Serial.println("Failed to initialize Bluetooth!");
    while (1);
  }
  Serial.println("Bluetooth initialized as client.");

  // Set the PIN for pairing
  esp_bt_gap_set_pin(ESP_BT_PIN_TYPE_FIXED, 4, (uint8_t*)pin);

  // Scan for devices and connect to the target
  connectToHost();
}

void loop() {
  // Check if data is available from the host device
  if (SerialBT.available()) {
    String receivedData = "";
    while (SerialBT.available()) {
      char c = SerialBT.read();
      receivedData += c;
    }
    Serial.print("Received: ");
    Serial.println(receivedData);
  }

  delay(100); // Add a small delay to avoid overwhelming the host device
}

void connectToHost() {
  Serial.println("Scanning for devices...");

  int numDevices = SerialBT.discover();
  if (numDevices == 0) {
    Serial.println("No devices found. Retrying...");
    delay(5000);
    connectToHost();
    return;
  }

  bool found = false;
  for (int i = 0; i < numDevices; i++) {
    String deviceName = SerialBT.getDiscoveredDeviceName(i);
    if (deviceName == targetDeviceName) {
      found = true;
      Serial.print("Found target device: ");
      Serial.println(deviceName);

      if (SerialBT.connect(deviceName)) {
        Serial.println("Connected to host device.");
      } else {
        Serial.println("Failed to connect. Retrying...");
        delay(5000);
        connectToHost();
      }
      break;
    }
  }

  if (!found) {
    Serial.println("Target device not found. Retrying...");
    delay(5000);
    connectToHost();
  }
}