Proyek: Smart Home Controller via BLE

Arsitektur Proyek

Error Handling & Reconnect

Di dunia nyata, koneksi BLE bisa terputus. Kita harus menangani error dengan baik.

Pola Error Handling:

Dart// 1. Connection with timeout
Future<void> _connectWithRetry(BluetoothDevice device) async {
  int retries = 3;
  while (retries > 0) {
    try {
      await device.connect(timeout: const Duration(seconds: 10));
      setState(() => _connected = true);
      return;
    } catch (e) {
      retries--;
      if (retries == 0) {
        setState(() => _status = 'Connection failed after 3 retries');
      }
      await Future.delayed(const Duration(seconds: 2));
    }
  }
}

// 2. Listen for disconnection
device.connectionState.listen((state) {
  if (state == BluetoothConnectionState.disconnected) {
    setState(() {
      _connected = false;
      _status = 'Disconnected — tap to reconnect';
    });
  }
});

// 3. Safe write with error handling
Future<void> _safeWrite(BluetoothCharacteristic char, String value) async {
  try {
    await char.write(utf8.encode(value), withoutResponse: false);
  } catch (e) {
    setState(() => _status = 'Write failed: $e');
  }
}

Rangkaian Hardware

Checklist Minggu 10

• Rangkaian hardware lengkap di breadboard
• ESP32 BLE Server dengan multiple services & characteristics
• Flutter app: BLE scan, connect, read, write, notify
• Dashboard menampilkan suhu, kelembaban, cahaya
• Toggle LED dan Relay via BLE
• Error handling: reconnect otomatis, timeout, UI indicators
• Connection status jelas di UI