From 6960f248e0ab14e9f742a54f3f1314766d016326 Mon Sep 17 00:00:00 2001
From: Sergei <serter2069@gmail.com>
Date: Sun, 1 Feb 2026 09:19:38 -0800
Subject: [PATCH] Implement comprehensive BLE error handling system
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- Add BLEError class with error codes, severity levels, and recovery actions
- Create error types for connection, permission, communication, WiFi, and sensor errors
- Add user-friendly error messages with localized titles
- Implement BLELogger for consistent logging with batch progress tracking
- Add parseBLEError utility to parse native BLE errors into typed BLEErrors
- Update BLEManager to use new error types with proper logging
- Update MockBLEManager to match error handling behavior for consistency
- Add comprehensive tests for error handling utilities (41 tests passing)

This enables proper error categorization, user-friendly messages, and
recovery suggestions for BLE operations.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 __tests__/services/ble/errors.test.ts | 411 ++++++++++++++++
 services/ble/BLEManager.ts            | 303 +++++++++---
 services/ble/MockBLEManager.ts        |  99 +++-
 services/ble/errors.ts                | 661 ++++++++++++++++++++++++++
 services/ble/index.ts                 |   3 +
 5 files changed, 1410 insertions(+), 67 deletions(-)
 create mode 100644 __tests__/services/ble/errors.test.ts
 create mode 100644 services/ble/errors.ts

diff --git a/__tests__/services/ble/errors.test.ts b/__tests__/services/ble/errors.test.ts
new file mode 100644
index 0000000..a3ba864
--- /dev/null
+++ b/__tests__/services/ble/errors.test.ts
@@ -0,0 +1,411 @@
+import {
+  BLEError,
+  BLEErrorCode,
+  BLEErrorSeverity,
+  BLERecoveryAction,
+  BLE_ERROR_MESSAGES,
+  BLE_RECOVERY_ACTIONS,
+  parseBLEError,
+  isBLEError,
+  getErrorInfo,
+  getRecoveryActionLabel,
+  BLELogger,
+} from '@/services/ble/errors';
+
+describe('BLEError', () => {
+  describe('constructor', () => {
+    it('creates error with correct code and default message', () => {
+      const error = new BLEError(BLEErrorCode.CONNECTION_FAILED);
+
+      expect(error.code).toBe(BLEErrorCode.CONNECTION_FAILED);
+      expect(error.name).toBe('BLEError');
+      expect(error.userMessage.title).toBe('Connection Failed');
+      expect(error.userMessage.message).toContain('Could not connect');
+      expect(error.timestamp).toBeGreaterThan(0);
+    });
+
+    it('creates error with custom message', () => {
+      const error = new BLEError(BLEErrorCode.CONNECTION_TIMEOUT, {
+        message: 'Custom timeout message',
+      });
+
+      expect(error.message).toBe('Custom timeout message');
+      expect(error.userMessage.title).toBe('Connection Timeout');
+    });
+
+    it('creates error with device context', () => {
+      const error = new BLEError(BLEErrorCode.DEVICE_NOT_FOUND, {
+        deviceId: 'device-123',
+        deviceName: 'WP_497_81a14c',
+      });
+
+      expect(error.deviceId).toBe('device-123');
+      expect(error.deviceName).toBe('WP_497_81a14c');
+    });
+
+    it('wraps original error', () => {
+      const originalError = new Error('Native BLE error');
+      const error = new BLEError(BLEErrorCode.COMMAND_FAILED, {
+        originalError,
+      });
+
+      expect(error.originalError).toBe(originalError);
+    });
+
+    it('sets correct severity for critical errors', () => {
+      const permissionError = new BLEError(BLEErrorCode.PERMISSION_DENIED);
+      const bluetoothError = new BLEError(BLEErrorCode.BLUETOOTH_DISABLED);
+
+      expect(permissionError.severity).toBe(BLEErrorSeverity.CRITICAL);
+      expect(bluetoothError.severity).toBe(BLEErrorSeverity.CRITICAL);
+    });
+
+    it('sets correct severity for warning errors', () => {
+      const busyError = new BLEError(BLEErrorCode.DEVICE_BUSY);
+      const scanError = new BLEError(BLEErrorCode.WIFI_SCAN_IN_PROGRESS);
+
+      expect(busyError.severity).toBe(BLEErrorSeverity.WARNING);
+      expect(scanError.severity).toBe(BLEErrorSeverity.WARNING);
+    });
+
+    it('sets recovery actions from mapping', () => {
+      const connectionError = new BLEError(BLEErrorCode.CONNECTION_FAILED);
+      const passwordError = new BLEError(BLEErrorCode.WIFI_PASSWORD_INCORRECT);
+
+      expect(connectionError.recoveryActions).toContain(BLERecoveryAction.RETRY);
+      expect(connectionError.recoveryActions).toContain(BLERecoveryAction.MOVE_CLOSER);
+
+      expect(passwordError.recoveryActions).toContain(BLERecoveryAction.CHECK_WIFI_PASSWORD);
+    });
+  });
+
+  describe('toLogString', () => {
+    it('formats error for logging with device name', () => {
+      const error = new BLEError(BLEErrorCode.CONNECTION_FAILED, {
+        deviceName: 'WP_497_81a14c',
+        message: 'Connection failed',
+      });
+
+      const logString = error.toLogString();
+
+      expect(logString).toContain('[BLE]');
+      expect(logString).toContain('[BLE_CONNECTION_FAILED]');
+      expect(logString).toContain('[WP_497_81a14c]');
+      expect(logString).toContain('Connection failed');
+    });
+
+    it('uses deviceId when deviceName is not available', () => {
+      const error = new BLEError(BLEErrorCode.COMMAND_TIMEOUT, {
+        deviceId: 'device-123',
+      });
+
+      const logString = error.toLogString();
+
+      expect(logString).toContain('[device-123]');
+    });
+  });
+
+  describe('isRetryable', () => {
+    it('returns true for retryable errors', () => {
+      const connectionError = new BLEError(BLEErrorCode.CONNECTION_FAILED);
+      const timeoutError = new BLEError(BLEErrorCode.COMMAND_TIMEOUT);
+
+      expect(connectionError.isRetryable()).toBe(true);
+      expect(timeoutError.isRetryable()).toBe(true);
+    });
+
+    it('returns false for non-retryable errors', () => {
+      const cancelledError = new BLEError(BLEErrorCode.OPERATION_CANCELLED);
+      const alreadyConnectedError = new BLEError(BLEErrorCode.ALREADY_CONNECTED);
+
+      expect(cancelledError.isRetryable()).toBe(false);
+      expect(alreadyConnectedError.isRetryable()).toBe(false);
+    });
+  });
+
+  describe('isSkippable', () => {
+    it('returns true for skippable errors in batch operations', () => {
+      const commandError = new BLEError(BLEErrorCode.COMMAND_FAILED);
+      const rebootError = new BLEError(BLEErrorCode.SENSOR_REBOOT_FAILED);
+
+      expect(commandError.isSkippable()).toBe(true);
+      expect(rebootError.isSkippable()).toBe(true);
+    });
+
+    it('returns false for non-skippable errors', () => {
+      const permissionError = new BLEError(BLEErrorCode.PERMISSION_DENIED);
+      const bluetoothError = new BLEError(BLEErrorCode.BLUETOOTH_DISABLED);
+
+      expect(permissionError.isSkippable()).toBe(false);
+      expect(bluetoothError.isSkippable()).toBe(false);
+    });
+  });
+});
+
+describe('parseBLEError', () => {
+  it('parses permission denied errors', () => {
+    const error = new Error('Bluetooth permissions not granted');
+    const bleError = parseBLEError(error);
+
+    expect(bleError.code).toBe(BLEErrorCode.PERMISSION_DENIED);
+  });
+
+  it('parses bluetooth disabled errors', () => {
+    const error = new Error('Bluetooth is disabled');
+    const bleError = parseBLEError(error);
+
+    expect(bleError.code).toBe(BLEErrorCode.BLUETOOTH_DISABLED);
+  });
+
+  it('parses timeout errors', () => {
+    const error = new Error('Connection timeout');
+    const bleError = parseBLEError(error);
+
+    expect(bleError.code).toBe(BLEErrorCode.CONNECTION_TIMEOUT);
+  });
+
+  it('parses connection in progress errors', () => {
+    const error = new Error('Connection already in progress');
+    const bleError = parseBLEError(error);
+
+    expect(bleError.code).toBe(BLEErrorCode.CONNECTION_IN_PROGRESS);
+  });
+
+  it('parses WiFi password incorrect errors', () => {
+    const error = new Error('WiFi password is incorrect');
+    const bleError = parseBLEError(error);
+
+    expect(bleError.code).toBe(BLEErrorCode.WIFI_PASSWORD_INCORRECT);
+  });
+
+  it('parses WiFi network not found errors', () => {
+    const error = new Error('WiFi network not found');
+    const bleError = parseBLEError(error);
+
+    expect(bleError.code).toBe(BLEErrorCode.WIFI_NETWORK_NOT_FOUND);
+  });
+
+  it('parses device disconnected errors', () => {
+    const error = new Error('Device disconnected unexpectedly');
+    const bleError = parseBLEError(error);
+
+    expect(bleError.code).toBe(BLEErrorCode.DEVICE_DISCONNECTED);
+  });
+
+  it('parses cancelled operation errors', () => {
+    const error = new Error('Operation was cancelled');
+    const bleError = parseBLEError(error);
+
+    expect(bleError.code).toBe(BLEErrorCode.OPERATION_CANCELLED);
+  });
+
+  it('includes device context when provided', () => {
+    const error = new Error('Connection timeout');
+    const bleError = parseBLEError(error, {
+      deviceId: 'device-123',
+      deviceName: 'WP_497_81a14c',
+    });
+
+    expect(bleError.deviceId).toBe('device-123');
+    expect(bleError.deviceName).toBe('WP_497_81a14c');
+  });
+
+  it('defaults to unknown error for unrecognized messages', () => {
+    const error = new Error('Some random error message');
+    const bleError = parseBLEError(error);
+
+    expect(bleError.code).toBe(BLEErrorCode.UNKNOWN_ERROR);
+  });
+
+  it('handles non-Error objects', () => {
+    const bleError = parseBLEError('string error');
+
+    expect(bleError).toBeInstanceOf(BLEError);
+    expect(bleError.code).toBe(BLEErrorCode.UNKNOWN_ERROR);
+  });
+});
+
+describe('isBLEError', () => {
+  it('returns true for BLEError instances', () => {
+    const error = new BLEError(BLEErrorCode.CONNECTION_FAILED);
+
+    expect(isBLEError(error)).toBe(true);
+  });
+
+  it('returns false for regular Error instances', () => {
+    const error = new Error('Regular error');
+
+    expect(isBLEError(error)).toBe(false);
+  });
+
+  it('returns false for non-error objects', () => {
+    expect(isBLEError('string')).toBe(false);
+    expect(isBLEError(null)).toBe(false);
+    expect(isBLEError(undefined)).toBe(false);
+    expect(isBLEError({})).toBe(false);
+  });
+});
+
+describe('getErrorInfo', () => {
+  it('extracts info from BLEError', () => {
+    const error = new BLEError(BLEErrorCode.WIFI_PASSWORD_INCORRECT);
+    const info = getErrorInfo(error);
+
+    expect(info.code).toBe(BLEErrorCode.WIFI_PASSWORD_INCORRECT);
+    expect(info.title).toBe('Wrong Password');
+    expect(info.message).toContain('incorrect');
+    expect(info.severity).toBe(BLEErrorSeverity.ERROR);
+    expect(info.recoveryActions).toContain(BLERecoveryAction.CHECK_WIFI_PASSWORD);
+    expect(info.isRetryable).toBe(true);
+  });
+
+  it('parses and extracts info from regular Error', () => {
+    const error = new Error('Bluetooth is disabled');
+    const info = getErrorInfo(error);
+
+    expect(info.code).toBe(BLEErrorCode.BLUETOOTH_DISABLED);
+    expect(info.title).toBe('Bluetooth Disabled');
+    expect(info.severity).toBe(BLEErrorSeverity.CRITICAL);
+    expect(info.recoveryActions).toContain(BLERecoveryAction.ENABLE_BLUETOOTH);
+  });
+});
+
+describe('getRecoveryActionLabel', () => {
+  it('returns correct labels for all actions', () => {
+    expect(getRecoveryActionLabel(BLERecoveryAction.RETRY)).toBe('Retry');
+    expect(getRecoveryActionLabel(BLERecoveryAction.SKIP)).toBe('Skip');
+    expect(getRecoveryActionLabel(BLERecoveryAction.CANCEL)).toBe('Cancel');
+    expect(getRecoveryActionLabel(BLERecoveryAction.ENABLE_BLUETOOTH)).toBe('Enable Bluetooth');
+    expect(getRecoveryActionLabel(BLERecoveryAction.GRANT_PERMISSIONS)).toBe('Grant Permission');
+    expect(getRecoveryActionLabel(BLERecoveryAction.MOVE_CLOSER)).toBe('Move Closer');
+    expect(getRecoveryActionLabel(BLERecoveryAction.CHECK_WIFI_PASSWORD)).toBe('Check Password');
+    expect(getRecoveryActionLabel(BLERecoveryAction.CONTACT_SUPPORT)).toBe('Contact Support');
+  });
+});
+
+describe('BLE_ERROR_MESSAGES', () => {
+  it('has messages for all error codes', () => {
+    const errorCodes = Object.values(BLEErrorCode);
+
+    for (const code of errorCodes) {
+      expect(BLE_ERROR_MESSAGES[code]).toBeDefined();
+      expect(BLE_ERROR_MESSAGES[code].title).toBeTruthy();
+      expect(BLE_ERROR_MESSAGES[code].message).toBeTruthy();
+    }
+  });
+});
+
+describe('BLE_RECOVERY_ACTIONS', () => {
+  it('has recovery actions for all error codes', () => {
+    const errorCodes = Object.values(BLEErrorCode);
+
+    for (const code of errorCodes) {
+      expect(BLE_RECOVERY_ACTIONS[code]).toBeDefined();
+      expect(Array.isArray(BLE_RECOVERY_ACTIONS[code])).toBe(true);
+    }
+  });
+});
+
+describe('BLELogger', () => {
+  // Spy on console methods
+  const consoleSpy = {
+    log: jest.spyOn(console, 'log').mockImplementation(),
+    warn: jest.spyOn(console, 'warn').mockImplementation(),
+    error: jest.spyOn(console, 'error').mockImplementation(),
+  };
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    BLELogger.enable();
+  });
+
+  afterAll(() => {
+    consoleSpy.log.mockRestore();
+    consoleSpy.warn.mockRestore();
+    consoleSpy.error.mockRestore();
+  });
+
+  it('logs messages with BLE prefix', () => {
+    BLELogger.log('Test message');
+
+    expect(consoleSpy.log).toHaveBeenCalledWith('[BLE] Test message', '');
+  });
+
+  it('logs warnings with BLE prefix', () => {
+    BLELogger.warn('Warning message');
+
+    expect(consoleSpy.warn).toHaveBeenCalledWith('[BLE] Warning message', '');
+  });
+
+  it('logs errors with BLE prefix', () => {
+    BLELogger.error('Error message');
+
+    expect(consoleSpy.error).toHaveBeenCalledWith('[BLE] Error message', '');
+  });
+
+  it('logs BLEError with formatted string', () => {
+    const error = new BLEError(BLEErrorCode.CONNECTION_FAILED, {
+      deviceName: 'WP_497',
+    });
+    BLELogger.error('Failed', error);
+
+    expect(consoleSpy.error).toHaveBeenCalled();
+    const loggedMessage = consoleSpy.error.mock.calls[0][0];
+    expect(loggedMessage).toContain('[BLE]');
+    expect(loggedMessage).toContain('[BLE_CONNECTION_FAILED]');
+    expect(loggedMessage).toContain('[WP_497]');
+  });
+
+  it('does not log when disabled', () => {
+    BLELogger.disable();
+    BLELogger.log('Should not appear');
+    BLELogger.warn('Should not appear');
+    BLELogger.error('Should not appear');
+
+    expect(consoleSpy.log).not.toHaveBeenCalled();
+    expect(consoleSpy.warn).not.toHaveBeenCalled();
+    expect(consoleSpy.error).not.toHaveBeenCalled();
+  });
+
+  describe('logBatchProgress', () => {
+    it('logs batch progress with success indicator', () => {
+      BLELogger.logBatchProgress(1, 5, 'WP_497', 'connected', true);
+
+      expect(consoleSpy.log).toHaveBeenCalled();
+      const loggedMessage = consoleSpy.log.mock.calls[0][0];
+      expect(loggedMessage).toContain('[1/5]');
+      expect(loggedMessage).toContain('WP_497');
+      expect(loggedMessage).toContain('✓');
+      expect(loggedMessage).toContain('connected');
+    });
+
+    it('logs batch progress with failure indicator', () => {
+      BLELogger.logBatchProgress(2, 5, 'WP_498', 'connection failed', false);
+
+      expect(consoleSpy.log).toHaveBeenCalled();
+      const loggedMessage = consoleSpy.log.mock.calls[0][0];
+      expect(loggedMessage).toContain('[2/5]');
+      expect(loggedMessage).toContain('✗');
+    });
+
+    it('logs batch progress with duration', () => {
+      BLELogger.logBatchProgress(3, 5, 'WP_499', 'SUCCESS', true, 8500);
+
+      expect(consoleSpy.log).toHaveBeenCalled();
+      const loggedMessage = consoleSpy.log.mock.calls[0][0];
+      expect(loggedMessage).toContain('(8.5s)');
+    });
+  });
+
+  describe('logBatchSummary', () => {
+    it('logs batch summary with counts', () => {
+      BLELogger.logBatchSummary(5, 4, 1, 45000);
+
+      expect(consoleSpy.log).toHaveBeenCalled();
+      const loggedMessage = consoleSpy.log.mock.calls[0][0];
+      expect(loggedMessage).toContain('4/5 succeeded');
+      expect(loggedMessage).toContain('1 failed');
+      expect(loggedMessage).toContain('45.0s');
+    });
+  });
+});
diff --git a/services/ble/BLEManager.ts b/services/ble/BLEManager.ts
index e7c17a4..44bb412 100644
--- a/services/ble/BLEManager.ts
+++ b/services/ble/BLEManager.ts
@@ -23,6 +23,13 @@ import {
   ReconnectState,
   DEFAULT_RECONNECT_CONFIG,
 } from './types';
+import {
+  BLEError,
+  BLEErrorCode,
+  BLELogger,
+  parseBLEError,
+  isBLEError,
+} from './errors';
 import { requestBLEPermissions, checkBluetoothEnabled } from './permissions';
 import base64 from 'react-native-base64';
 
@@ -127,16 +134,27 @@ export class RealBLEManager implements IBLEManager {
   }
 
   async scanDevices(): Promise<WPDevice[]> {
+    BLELogger.log('Starting device scan...');
+    const startTime = Date.now();
+
     // Check permissions with graceful fallback
     const permissionStatus = await requestBLEPermissions();
     if (!permissionStatus.granted) {
-      throw new Error(permissionStatus.error || 'Bluetooth permissions not granted');
+      const error = new BLEError(BLEErrorCode.PERMISSION_DENIED, {
+        message: permissionStatus.error,
+      });
+      BLELogger.error('Scan failed: permission denied', error);
+      throw error;
     }
 
     // Check Bluetooth state
     const bluetoothStatus = await checkBluetoothEnabled(this.manager);
     if (!bluetoothStatus.enabled) {
-      throw new Error(bluetoothStatus.error || 'Bluetooth is disabled. Please enable it in settings.');
+      const error = new BLEError(BLEErrorCode.BLUETOOTH_DISABLED, {
+        message: bluetoothStatus.error,
+      });
+      BLELogger.error('Scan failed: Bluetooth disabled', error);
+      throw error;
     }
 
     const foundDevices = new Map<string, WPDevice>();
@@ -150,7 +168,9 @@ export class RealBLEManager implements IBLEManager {
         (error, device) => {
           if (error) {
             this.scanning = false;
-            reject(error);
+            const bleError = parseBLEError(error, { operation: 'scan' });
+            BLELogger.error('Scan error', bleError);
+            reject(bleError);
             return;
           }
 
@@ -170,6 +190,8 @@ export class RealBLEManager implements IBLEManager {
               rssi: device.rssi || -100,
               wellId,
             });
+
+            BLELogger.log(`Found device: ${device.name} (RSSI: ${device.rssi})`);
           }
         }
       );
@@ -177,7 +199,10 @@ export class RealBLEManager implements IBLEManager {
       // Stop scan after timeout
       setTimeout(() => {
         this.stopScan();
-        resolve(Array.from(foundDevices.values()));
+        const duration = Date.now() - startTime;
+        const devices = Array.from(foundDevices.values());
+        BLELogger.log(`Scan complete: found ${devices.length} devices (${(duration / 1000).toFixed(1)}s)`);
+        resolve(devices);
       }, BLE_CONFIG.SCAN_TIMEOUT);
     });
   }
@@ -190,10 +215,15 @@ export class RealBLEManager implements IBLEManager {
   }
 
   async connectDevice(deviceId: string): Promise<boolean> {
+    const startTime = Date.now();
+    BLELogger.log(`Connecting to device: ${deviceId}`);
+
     try {
       // Check if connection is already in progress
       if (this.connectingDevices.has(deviceId)) {
-        throw new Error('Connection already in progress for this device');
+        const error = new BLEError(BLEErrorCode.CONNECTION_IN_PROGRESS, { deviceId });
+        BLELogger.warn('Connection already in progress', error);
+        throw error;
       }
 
       // Check if already connected
@@ -201,6 +231,7 @@ export class RealBLEManager implements IBLEManager {
       if (existingDevice) {
         const isConnected = await existingDevice.isConnected();
         if (isConnected) {
+          BLELogger.log(`Device already connected: ${deviceId}`);
           this.updateConnectionState(deviceId, BLEConnectionState.READY, existingDevice.name || undefined);
           this.emitEvent(deviceId, 'ready');
           return true;
@@ -219,19 +250,27 @@ export class RealBLEManager implements IBLEManager {
       // Step 0: Check permissions (required for Android 12+)
       const permissionStatus = await requestBLEPermissions();
       if (!permissionStatus.granted) {
-        const error = permissionStatus.error || 'Bluetooth permissions not granted';
-        this.updateConnectionState(deviceId, BLEConnectionState.ERROR, undefined, error);
-        this.emitEvent(deviceId, 'connection_failed', { error });
-        throw new Error(error);
+        const error = new BLEError(BLEErrorCode.PERMISSION_DENIED, {
+          deviceId,
+          message: permissionStatus.error,
+        });
+        this.updateConnectionState(deviceId, BLEConnectionState.ERROR, undefined, error.userMessage.message);
+        this.emitEvent(deviceId, 'connection_failed', { error: error.message, code: error.code });
+        BLELogger.error('Connection failed: permission denied', error);
+        throw error;
       }
 
       // Step 0.5: Check Bluetooth is enabled
       const bluetoothStatus = await checkBluetoothEnabled(this.manager);
       if (!bluetoothStatus.enabled) {
-        const error = bluetoothStatus.error || 'Bluetooth is disabled. Please enable it in settings.';
-        this.updateConnectionState(deviceId, BLEConnectionState.ERROR, undefined, error);
-        this.emitEvent(deviceId, 'connection_failed', { error });
-        throw new Error(error);
+        const error = new BLEError(BLEErrorCode.BLUETOOTH_DISABLED, {
+          deviceId,
+          message: bluetoothStatus.error,
+        });
+        this.updateConnectionState(deviceId, BLEConnectionState.ERROR, undefined, error.userMessage.message);
+        this.emitEvent(deviceId, 'connection_failed', { error: error.message, code: error.code });
+        BLELogger.error('Connection failed: Bluetooth disabled', error);
+        throw error;
       }
 
       const device = await this.manager.connectToDevice(deviceId, {
@@ -240,17 +279,21 @@ export class RealBLEManager implements IBLEManager {
 
       // Update state to CONNECTED
       this.updateConnectionState(deviceId, BLEConnectionState.CONNECTED, device.name || undefined);
+      BLELogger.log(`Connected to device: ${device.name || deviceId}`);
 
       // Update state to DISCOVERING
       this.updateConnectionState(deviceId, BLEConnectionState.DISCOVERING, device.name || undefined);
       await device.discoverAllServicesAndCharacteristics();
+      BLELogger.log(`Services discovered for: ${device.name || deviceId}`);
 
       // Request larger MTU for Android (default is 23 bytes which is too small)
       if (Platform.OS === 'android') {
         try {
           await device.requestMTU(512);
+          BLELogger.log('MTU increased to 512');
         } catch {
           // MTU request may fail on some devices - continue anyway
+          BLELogger.warn('MTU request failed, continuing with default');
         }
       }
 
@@ -260,11 +303,19 @@ export class RealBLEManager implements IBLEManager {
       this.updateConnectionState(deviceId, BLEConnectionState.READY, device.name || undefined);
       this.emitEvent(deviceId, 'ready');
 
+      const duration = Date.now() - startTime;
+      BLELogger.log(`Device ready: ${device.name || deviceId} (${(duration / 1000).toFixed(1)}s)`);
+
       return true;
     } catch (error: any) {
-      const errorMessage = error?.message || 'Connection failed';
+      // Parse error if not already a BLEError
+      const bleError = isBLEError(error) ? error : parseBLEError(error, { deviceId });
+      const errorMessage = bleError.userMessage.message;
+
       this.updateConnectionState(deviceId, BLEConnectionState.ERROR, undefined, errorMessage);
-      this.emitEvent(deviceId, 'connection_failed', { error: errorMessage });
+      this.emitEvent(deviceId, 'connection_failed', { error: errorMessage, code: bleError.code });
+      BLELogger.error(`Connection failed for ${deviceId}`, bleError);
+
       return false;
     } finally {
       // Always remove from connecting set when done (success or failure)
@@ -336,10 +387,15 @@ export class RealBLEManager implements IBLEManager {
 
   async sendCommand(deviceId: string, command: string): Promise<string> {
     const startTime = Date.now();
+    // Only log first 20 chars to avoid logging passwords
+    const safeCommand = command.length > 20 ? command.substring(0, 20) + '...' : command;
+    BLELogger.log(`Sending command to ${deviceId}: ${safeCommand}`);
 
     const device = this.connectedDevices.get(deviceId);
     if (!device) {
-      throw new Error('Device not connected');
+      const error = new BLEError(BLEErrorCode.DEVICE_DISCONNECTED, { deviceId });
+      BLELogger.error('Command failed: device not connected', error);
+      throw error;
     }
 
     // Verify device is still connected
@@ -347,10 +403,18 @@ export class RealBLEManager implements IBLEManager {
       const isConnected = await device.isConnected();
       if (!isConnected) {
         this.connectedDevices.delete(deviceId);
-        throw new Error('Device disconnected');
+        const error = new BLEError(BLEErrorCode.DEVICE_DISCONNECTED, { deviceId });
+        BLELogger.error('Command failed: device disconnected', error);
+        throw error;
       }
-    } catch {
-      throw new Error('Failed to verify connection');
+    } catch (err) {
+      if (isBLEError(err)) throw err;
+      const error = new BLEError(BLEErrorCode.DEVICE_DISCONNECTED, {
+        deviceId,
+        originalError: err instanceof Error ? err : undefined,
+      });
+      BLELogger.error('Command failed: connection verification failed', error);
+      throw error;
     }
 
     // Generate unique transaction ID to prevent Android null pointer issues
@@ -398,10 +462,15 @@ export class RealBLEManager implements IBLEManager {
         const deviceKey = `${deviceId}`;
         this.updateCommunicationStats(deviceKey, false, responseTime);
 
-        // Ensure error has a valid message (fixes Android NullPointerException)
-        const errorMessage = error?.message || error?.reason || 'BLE operation failed';
+        // Parse and wrap error with proper BLEError
+        const bleError = parseBLEError(error, {
+          deviceId,
+          deviceName: device.name || undefined,
+          operation: 'command',
+        });
 
-        reject(new Error(`[${errorCode}] ${errorMessage}`));
+        BLELogger.error(`Command failed for ${deviceId}`, bleError);
+        reject(bleError);
       };
 
       try {
@@ -455,7 +524,12 @@ export class RealBLEManager implements IBLEManager {
         // Timeout
         timeoutId = setTimeout(() => {
           if (!responseReceived) {
-            safeReject(new Error('Command timeout'));
+            const timeoutError = new BLEError(BLEErrorCode.COMMAND_TIMEOUT, {
+              deviceId,
+              deviceName: device.name || undefined,
+              message: `Command timed out after ${BLE_CONFIG.COMMAND_TIMEOUT}ms`,
+            });
+            safeReject(timeoutError);
           }
         }, BLE_CONFIG.COMMAND_TIMEOUT);
       } catch (error: any) {
@@ -465,11 +539,23 @@ export class RealBLEManager implements IBLEManager {
   }
 
   async getWiFiList(deviceId: string): Promise<WiFiNetwork[]> {
+    BLELogger.log(`Getting WiFi list from device: ${deviceId}`);
 
     // Step 1: Unlock device
-    const unlockResponse = await this.sendCommand(deviceId, BLE_COMMANDS.PIN_UNLOCK);
-    if (!unlockResponse.includes('ok')) {
-      throw new Error('Failed to unlock device');
+    try {
+      const unlockResponse = await this.sendCommand(deviceId, BLE_COMMANDS.PIN_UNLOCK);
+      if (!unlockResponse.includes('ok')) {
+        throw new BLEError(BLEErrorCode.PIN_UNLOCK_FAILED, { deviceId });
+      }
+      BLELogger.log('Device unlocked successfully');
+    } catch (err) {
+      if (isBLEError(err)) throw err;
+      const error = new BLEError(BLEErrorCode.PIN_UNLOCK_FAILED, {
+        deviceId,
+        originalError: err instanceof Error ? err : undefined,
+      });
+      BLELogger.error('Failed to unlock device', error);
+      throw error;
     }
 
     // Step 2: Get WiFi list
@@ -478,15 +564,23 @@ export class RealBLEManager implements IBLEManager {
     // Parse response: "mac,XXXXXX|w|COUNT|SSID1,RSSI1|SSID2,RSSI2|..."
     const parts = listResponse.split('|');
     if (parts.length < 3) {
-      throw new Error('Invalid WiFi list response');
+      const error = new BLEError(BLEErrorCode.INVALID_RESPONSE, {
+        deviceId,
+        message: 'Invalid WiFi list response format',
+      });
+      BLELogger.error('Invalid response', error);
+      throw error;
     }
 
     const count = parseInt(parts[2], 10);
     if (count < 0) {
       if (count === -1) {
-        throw new Error('WiFi scan in progress, please wait');
+        const error = new BLEError(BLEErrorCode.WIFI_SCAN_IN_PROGRESS, { deviceId });
+        BLELogger.warn('WiFi scan in progress', error);
+        throw error;
       }
       if (count === -2) {
+        BLELogger.log('No WiFi networks found');
         return []; // No networks found
       }
     }
@@ -518,13 +612,25 @@ export class RealBLEManager implements IBLEManager {
   }
 
   async setWiFi(deviceId: string, ssid: string, password: string): Promise<boolean> {
+    BLELogger.log(`Setting WiFi on device: ${deviceId}, SSID: ${ssid}`);
+
     // Pre-validate credentials before BLE transmission
     // Check for characters that would break BLE protocol parsing
     if (ssid.includes('|') || ssid.includes(',')) {
-      throw new Error('Network name contains invalid characters. Please select a different network.');
+      const error = new BLEError(BLEErrorCode.WIFI_INVALID_CREDENTIALS, {
+        deviceId,
+        message: 'Network name contains invalid characters',
+      });
+      BLELogger.error('Invalid SSID characters', error);
+      throw error;
     }
     if (password.includes('|')) {
-      throw new Error('Password contains an invalid character (|). Please use a different password.');
+      const error = new BLEError(BLEErrorCode.WIFI_INVALID_CREDENTIALS, {
+        deviceId,
+        message: 'Password contains an invalid character (|)',
+      });
+      BLELogger.error('Invalid password characters', error);
+      throw error;
     }
 
     // Step 1: Unlock device
@@ -532,15 +638,25 @@ export class RealBLEManager implements IBLEManager {
     try {
       unlockResponse = await this.sendCommand(deviceId, BLE_COMMANDS.PIN_UNLOCK);
     } catch (err: any) {
-      if (err.message?.includes('timeout')) {
-        throw new Error('Sensor not responding. Please move closer and try again.');
+      if (isBLEError(err) && err.code === BLEErrorCode.COMMAND_TIMEOUT) {
+        const error = new BLEError(BLEErrorCode.SENSOR_NOT_RESPONDING, {
+          deviceId,
+          originalError: err,
+        });
+        BLELogger.error('Sensor not responding during unlock', error);
+        throw error;
       }
-      throw new Error(`Cannot communicate with sensor: ${err.message}`);
+      const error = parseBLEError(err, { deviceId, operation: 'unlock' });
+      BLELogger.error('Unlock failed', error);
+      throw error;
     }
 
     if (!unlockResponse.includes('ok')) {
-      throw new Error('Sensor authentication failed. Please try reconnecting.');
+      const error = new BLEError(BLEErrorCode.PIN_UNLOCK_FAILED, { deviceId });
+      BLELogger.error('PIN unlock rejected', error);
+      throw error;
     }
+    BLELogger.log('Device unlocked for WiFi configuration');
 
     // Step 1.5: Check if already connected to the target WiFi
     // This prevents "W|fail" when sensor uses old saved credentials
@@ -565,14 +681,23 @@ export class RealBLEManager implements IBLEManager {
     try {
       setResponse = await this.sendCommand(deviceId, command);
     } catch (err: any) {
-      if (err.message?.includes('timeout')) {
-        throw new Error('Sensor did not respond to WiFi config. Please try again.');
+      if (isBLEError(err) && err.code === BLEErrorCode.COMMAND_TIMEOUT) {
+        const error = new BLEError(BLEErrorCode.SENSOR_NOT_RESPONDING, {
+          deviceId,
+          message: 'Sensor did not respond to WiFi config',
+          originalError: err,
+        });
+        BLELogger.error('WiFi config timeout', error);
+        throw error;
       }
-      throw new Error(`WiFi configuration failed: ${err.message}`);
+      const error = parseBLEError(err, { deviceId, operation: 'wifi_config' });
+      BLELogger.error('WiFi config failed', error);
+      throw error;
     }
 
     // Parse response: "mac,XXXXXX|W|ok" or "mac,XXXXXX|W|fail" or other errors
     if (setResponse.includes('|W|ok')) {
+      BLELogger.log(`WiFi configured successfully for ${ssid}`);
       return true;
     }
 
@@ -587,6 +712,7 @@ export class RealBLEManager implements IBLEManager {
 
           // If connected to target SSID (using old credentials), consider it success
           if (currentSsid && currentSsid.trim().toLowerCase() === ssid.toLowerCase() && rssi < 0) {
+            BLELogger.log(`Sensor already connected to ${ssid} (using existing credentials)`);
             return true;
           }
         }
@@ -595,27 +721,53 @@ export class RealBLEManager implements IBLEManager {
       }
 
       // Password was definitely wrong
-      throw new Error('WiFi password is incorrect. Please check and try again.');
+      const error = new BLEError(BLEErrorCode.WIFI_PASSWORD_INCORRECT, { deviceId });
+      BLELogger.error('WiFi password incorrect', error);
+      throw error;
     }
 
     if (setResponse.includes('timeout') || setResponse.includes('Timeout')) {
-      throw new Error('Sensor did not respond to WiFi config. Please try again.');
+      const error = new BLEError(BLEErrorCode.SENSOR_NOT_RESPONDING, {
+        deviceId,
+        message: 'Sensor did not respond to WiFi config',
+      });
+      BLELogger.error('WiFi config timeout', error);
+      throw error;
     }
 
     // Check for specific error patterns
     if (setResponse.includes('not found') || setResponse.includes('no network')) {
-      throw new Error('WiFi network not found. Make sure the sensor is within range of your router.');
+      const error = new BLEError(BLEErrorCode.WIFI_NETWORK_NOT_FOUND, { deviceId });
+      BLELogger.error('WiFi network not found', error);
+      throw error;
     }
 
     // Unknown error - provide helpful message
-    throw new Error('WiFi configuration failed. Please try again or contact support.');
+    const error = new BLEError(BLEErrorCode.WIFI_CONFIG_FAILED, {
+      deviceId,
+      message: `Unexpected response: ${setResponse}`,
+    });
+    BLELogger.error('WiFi config failed with unknown error', error);
+    throw error;
   }
 
   async getCurrentWiFi(deviceId: string): Promise<WiFiStatus | null> {
+    BLELogger.log(`Getting current WiFi status from device: ${deviceId}`);
+
     // Step 1: Unlock device
-    const unlockResponse = await this.sendCommand(deviceId, BLE_COMMANDS.PIN_UNLOCK);
-    if (!unlockResponse.includes('ok')) {
-      throw new Error('Failed to unlock device');
+    try {
+      const unlockResponse = await this.sendCommand(deviceId, BLE_COMMANDS.PIN_UNLOCK);
+      if (!unlockResponse.includes('ok')) {
+        throw new BLEError(BLEErrorCode.PIN_UNLOCK_FAILED, { deviceId });
+      }
+    } catch (err) {
+      if (isBLEError(err)) throw err;
+      const error = new BLEError(BLEErrorCode.PIN_UNLOCK_FAILED, {
+        deviceId,
+        originalError: err instanceof Error ? err : undefined,
+      });
+      BLELogger.error('Failed to unlock device for WiFi status', error);
+      throw error;
     }
 
     // Step 2: Get current WiFi status
@@ -624,27 +776,49 @@ export class RealBLEManager implements IBLEManager {
     // Parse response: "mac,XXXXXX|a|SSID,RSSI" or "mac,XXXXXX|a|,0" (not connected)
     const parts = statusResponse.split('|');
     if (parts.length < 3) {
+      BLELogger.log('No WiFi status available (invalid response)');
       return null;
     }
 
     const [ssid, rssiStr] = parts[2].split(',');
     if (!ssid || ssid.trim() === '') {
+      BLELogger.log('Sensor not connected to any WiFi network');
       return null; // Not connected
     }
 
+    const rssi = parseInt(rssiStr, 10);
+    BLELogger.log(`Current WiFi: ${ssid} (RSSI: ${rssi})`);
+
     return {
       ssid: ssid.trim(),
-      rssi: parseInt(rssiStr, 10),
+      rssi: rssi,
       connected: true,
     };
   }
 
   async rebootDevice(deviceId: string): Promise<void> {
-    // Step 1: Unlock device
-    await this.sendCommand(deviceId, BLE_COMMANDS.PIN_UNLOCK);
+    BLELogger.log(`Rebooting device: ${deviceId}`);
 
-    // Step 2: Reboot (device will disconnect)
-    await this.sendCommand(deviceId, BLE_COMMANDS.REBOOT);
+    try {
+      // Step 1: Unlock device
+      await this.sendCommand(deviceId, BLE_COMMANDS.PIN_UNLOCK);
+
+      // Step 2: Reboot (device will disconnect)
+      await this.sendCommand(deviceId, BLE_COMMANDS.REBOOT);
+
+      BLELogger.log(`Reboot command sent to ${deviceId}`);
+    } catch (err) {
+      if (isBLEError(err)) {
+        BLELogger.error('Reboot failed', err);
+        throw err;
+      }
+      const error = new BLEError(BLEErrorCode.SENSOR_REBOOT_FAILED, {
+        deviceId,
+        originalError: err instanceof Error ? err : undefined,
+      });
+      BLELogger.error('Reboot failed', error);
+      throw error;
+    }
 
     // Remove from connected devices
     this.connectedDevices.delete(deviceId);
@@ -930,27 +1104,41 @@ export class RealBLEManager implements IBLEManager {
     onProgress?: (deviceId: string, status: 'connecting' | 'configuring' | 'rebooting' | 'success' | 'error', error?: string) => void
   ): Promise<BulkWiFiResult[]> {
     const results: BulkWiFiResult[] = [];
+    const total = devices.length;
+    const batchStartTime = Date.now();
 
-    for (const device of devices) {
-      const { id: deviceId, name: deviceName } = device;
+    BLELogger.log(`Starting bulk WiFi setup for ${total} devices, SSID: ${ssid}`);
+
+    for (let i = 0; i < devices.length; i++) {
+      const { id: deviceId, name: deviceName } = devices[i];
+      const deviceStartTime = Date.now();
+      const index = i + 1;
 
       try {
         // Step 1: Connect
+        BLELogger.logBatchProgress(index, total, deviceName, 'connecting...');
         onProgress?.(deviceId, 'connecting');
         const connected = await this.connectDevice(deviceId);
         if (!connected) {
-          throw new Error('Could not connect to device');
+          throw new BLEError(BLEErrorCode.CONNECTION_FAILED, { deviceId, deviceName });
         }
+        BLELogger.logBatchProgress(index, total, deviceName, 'connected', true);
 
         // Step 2: Set WiFi
+        BLELogger.logBatchProgress(index, total, deviceName, 'setting WiFi...');
         onProgress?.(deviceId, 'configuring');
         await this.setWiFi(deviceId, ssid, password);
+        BLELogger.logBatchProgress(index, total, deviceName, 'WiFi configured', true);
 
         // Step 3: Reboot
+        BLELogger.logBatchProgress(index, total, deviceName, 'rebooting...');
         onProgress?.(deviceId, 'rebooting');
         await this.rebootDevice(deviceId);
+        BLELogger.logBatchProgress(index, total, deviceName, 'rebooted', true);
 
         // Success
+        const duration = Date.now() - deviceStartTime;
+        BLELogger.logBatchProgress(index, total, deviceName, 'SUCCESS', true, duration);
         onProgress?.(deviceId, 'success');
         results.push({
           deviceId,
@@ -958,7 +1146,10 @@ export class RealBLEManager implements IBLEManager {
           success: true,
         });
       } catch (error: any) {
-        const errorMessage = error?.message || 'WiFi configuration failed';
+        const bleError = isBLEError(error) ? error : parseBLEError(error, { deviceId, deviceName });
+        const errorMessage = bleError.userMessage.message;
+
+        BLELogger.logBatchProgress(index, total, deviceName, `ERROR: ${errorMessage}`, false);
         onProgress?.(deviceId, 'error', errorMessage);
         results.push({
           deviceId,
@@ -969,6 +1160,12 @@ export class RealBLEManager implements IBLEManager {
       }
     }
 
+    // Log summary
+    const succeeded = results.filter(r => r.success).length;
+    const failed = results.filter(r => !r.success).length;
+    const batchDuration = Date.now() - batchStartTime;
+    BLELogger.logBatchSummary(total, succeeded, failed, batchDuration);
+
     return results;
   }
 
diff --git a/services/ble/MockBLEManager.ts b/services/ble/MockBLEManager.ts
index 9fc5b19..afadf11 100644
--- a/services/ble/MockBLEManager.ts
+++ b/services/ble/MockBLEManager.ts
@@ -19,6 +19,13 @@ import {
   ReconnectState,
   DEFAULT_RECONNECT_CONFIG,
 } from './types';
+import {
+  BLEError,
+  BLEErrorCode,
+  BLELogger,
+  isBLEError,
+  parseBLEError,
+} from './errors';
 
 const delay = (ms: number) => new Promise(resolve => setTimeout(resolve, ms));
 
@@ -126,7 +133,9 @@ export class MockBLEManager implements IBLEManager {
   }
 
   async scanDevices(): Promise<WPDevice[]> {
+    BLELogger.log('[Mock] Starting device scan...');
     await delay(2000); // Simulate scan delay
+    BLELogger.log(`[Mock] Scan complete: found ${this.mockDevices.length} devices`);
     return this.mockDevices;
   }
 
@@ -134,14 +143,19 @@ export class MockBLEManager implements IBLEManager {
   }
 
   async connectDevice(deviceId: string): Promise<boolean> {
+    BLELogger.log(`[Mock] Connecting to device: ${deviceId}`);
+
     try {
       // Check if connection is already in progress
       if (this.connectingDevices.has(deviceId)) {
-        throw new Error('Connection already in progress for this device');
+        const error = new BLEError(BLEErrorCode.CONNECTION_IN_PROGRESS, { deviceId });
+        BLELogger.warn('[Mock] Connection already in progress', error);
+        throw error;
       }
 
       // Check if already connected
       if (this.connectedDevices.has(deviceId)) {
+        BLELogger.log(`[Mock] Device already connected: ${deviceId}`);
         this.updateConnectionState(deviceId, BLEConnectionState.READY);
         this.emitEvent(deviceId, 'ready');
         return true;
@@ -163,11 +177,15 @@ export class MockBLEManager implements IBLEManager {
       this.updateConnectionState(deviceId, BLEConnectionState.READY);
       this.emitEvent(deviceId, 'ready');
 
+      BLELogger.log(`[Mock] Device ready: ${deviceId}`);
       return true;
     } catch (error: any) {
-      const errorMessage = error?.message || 'Connection failed';
+      const bleError = isBLEError(error) ? error : parseBLEError(error, { deviceId });
+      const errorMessage = bleError.userMessage.message;
+
       this.updateConnectionState(deviceId, BLEConnectionState.ERROR, undefined, errorMessage);
-      this.emitEvent(deviceId, 'connection_failed', { error: errorMessage });
+      this.emitEvent(deviceId, 'connection_failed', { error: errorMessage, code: bleError.code });
+      BLELogger.error(`[Mock] Connection failed for ${deviceId}`, bleError);
       return false;
     } finally {
       // Always remove from connecting set when done (success or failure)
@@ -223,14 +241,25 @@ export class MockBLEManager implements IBLEManager {
     ssid: string,
     password: string
   ): Promise<boolean> {
+    BLELogger.log(`[Mock] Setting WiFi on device: ${deviceId}, SSID: ${ssid}`);
     await delay(2000);
 
     // Pre-validate credentials (same as real BLEManager)
     if (ssid.includes('|') || ssid.includes(',')) {
-      throw new Error('Network name contains invalid characters. Please select a different network.');
+      const error = new BLEError(BLEErrorCode.WIFI_INVALID_CREDENTIALS, {
+        deviceId,
+        message: 'Network name contains invalid characters',
+      });
+      BLELogger.error('[Mock] Invalid SSID characters', error);
+      throw error;
     }
     if (password.includes('|')) {
-      throw new Error('Password contains an invalid character (|). Please use a different password.');
+      const error = new BLEError(BLEErrorCode.WIFI_INVALID_CREDENTIALS, {
+        deviceId,
+        message: 'Password contains an invalid character (|)',
+      });
+      BLELogger.error('[Mock] Invalid password characters', error);
+      throw error;
     }
 
     // Simulate various failure scenarios for testing
@@ -240,34 +269,56 @@ export class MockBLEManager implements IBLEManager {
 
     // Simulate wrong password
     if (lowerPassword === 'wrongpass' || lowerPassword === 'wrong') {
-      throw new Error('WiFi password is incorrect. Please check and try again.');
+      const error = new BLEError(BLEErrorCode.WIFI_PASSWORD_INCORRECT, { deviceId });
+      BLELogger.error('[Mock] Wrong password simulated', error);
+      throw error;
     }
 
     // Simulate network not found
     if (lowerSsid.includes('notfound') || lowerSsid === 'hidden_network') {
-      throw new Error('WiFi network not found. Make sure the sensor is within range of your router.');
+      const error = new BLEError(BLEErrorCode.WIFI_NETWORK_NOT_FOUND, { deviceId });
+      BLELogger.error('[Mock] Network not found simulated', error);
+      throw error;
     }
 
     // Simulate timeout
     if (lowerSsid.includes('timeout') || lowerPassword === 'timeout') {
-      throw new Error('Sensor did not respond to WiFi config. Please try again.');
+      const error = new BLEError(BLEErrorCode.SENSOR_NOT_RESPONDING, {
+        deviceId,
+        message: 'Sensor did not respond to WiFi config',
+      });
+      BLELogger.error('[Mock] Timeout simulated', error);
+      throw error;
     }
 
     // Simulate sensor not responding
     if (lowerSsid.includes('offline')) {
-      throw new Error('Sensor not responding. Please move closer and try again.');
+      const error = new BLEError(BLEErrorCode.SENSOR_NOT_RESPONDING, { deviceId });
+      BLELogger.error('[Mock] Sensor offline simulated', error);
+      throw error;
     }
 
     // Validate password length (WPA/WPA2 requirement)
     if (password.length < 8) {
-      throw new Error('Password must be at least 8 characters for WPA/WPA2 networks.');
+      const error = new BLEError(BLEErrorCode.WIFI_INVALID_CREDENTIALS, {
+        deviceId,
+        message: 'Password must be at least 8 characters for WPA/WPA2 networks',
+      });
+      BLELogger.error('[Mock] Password too short', error);
+      throw error;
     }
 
     if (password.length > 63) {
-      throw new Error('Password cannot exceed 63 characters.');
+      const error = new BLEError(BLEErrorCode.WIFI_INVALID_CREDENTIALS, {
+        deviceId,
+        message: 'Password cannot exceed 63 characters',
+      });
+      BLELogger.error('[Mock] Password too long', error);
+      throw error;
     }
 
     // Success for all other cases
+    BLELogger.log(`[Mock] WiFi configured successfully for ${ssid}`);
     return true;
   }
 
@@ -430,25 +481,36 @@ export class MockBLEManager implements IBLEManager {
     onProgress?: (deviceId: string, status: 'connecting' | 'configuring' | 'rebooting' | 'success' | 'error', error?: string) => void
   ): Promise<BulkWiFiResult[]> {
     const results: BulkWiFiResult[] = [];
+    const total = devices.length;
+    const batchStartTime = Date.now();
 
-    for (const device of devices) {
-      const { id: deviceId, name: deviceName } = device;
+    BLELogger.log(`[Mock] Starting bulk WiFi setup for ${total} devices, SSID: ${ssid}`);
+
+    for (let i = 0; i < devices.length; i++) {
+      const { id: deviceId, name: deviceName } = devices[i];
+      const index = i + 1;
 
       try {
         // Step 1: Connect (mock)
+        BLELogger.logBatchProgress(index, total, deviceName, 'connecting...');
         onProgress?.(deviceId, 'connecting');
         await delay(800);
         await this.connectDevice(deviceId);
+        BLELogger.logBatchProgress(index, total, deviceName, 'connected', true);
 
         // Step 2: Set WiFi (mock)
+        BLELogger.logBatchProgress(index, total, deviceName, 'setting WiFi...');
         onProgress?.(deviceId, 'configuring');
         await delay(1200);
         await this.setWiFi(deviceId, ssid, password);
+        BLELogger.logBatchProgress(index, total, deviceName, 'WiFi configured', true);
 
         // Step 3: Reboot (mock)
+        BLELogger.logBatchProgress(index, total, deviceName, 'rebooting...');
         onProgress?.(deviceId, 'rebooting');
         await delay(600);
         await this.rebootDevice(deviceId);
+        BLELogger.logBatchProgress(index, total, deviceName, 'SUCCESS', true);
 
         // Success
         onProgress?.(deviceId, 'success');
@@ -458,7 +520,10 @@ export class MockBLEManager implements IBLEManager {
           success: true,
         });
       } catch (error: any) {
-        const errorMessage = error?.message || 'WiFi configuration failed';
+        const bleError = isBLEError(error) ? error : parseBLEError(error, { deviceId, deviceName });
+        const errorMessage = bleError.userMessage.message;
+
+        BLELogger.logBatchProgress(index, total, deviceName, `ERROR: ${errorMessage}`, false);
         onProgress?.(deviceId, 'error', errorMessage);
         results.push({
           deviceId,
@@ -469,6 +534,12 @@ export class MockBLEManager implements IBLEManager {
       }
     }
 
+    // Log summary
+    const succeeded = results.filter(r => r.success).length;
+    const failed = results.filter(r => !r.success).length;
+    const batchDuration = Date.now() - batchStartTime;
+    BLELogger.logBatchSummary(total, succeeded, failed, batchDuration);
+
     return results;
   }
 
diff --git a/services/ble/errors.ts b/services/ble/errors.ts
new file mode 100644
index 0000000..358ba25
--- /dev/null
+++ b/services/ble/errors.ts
@@ -0,0 +1,661 @@
+// BLE Error Types and Error Handling Utilities
+
+/**
+ * BLE Error Codes
+ * Categorized by operation type for easier handling
+ */
+export enum BLEErrorCode {
+  // Connection errors (100-199)
+  CONNECTION_FAILED = 'BLE_CONNECTION_FAILED',
+  CONNECTION_TIMEOUT = 'BLE_CONNECTION_TIMEOUT',
+  CONNECTION_IN_PROGRESS = 'BLE_CONNECTION_IN_PROGRESS',
+  DEVICE_NOT_FOUND = 'BLE_DEVICE_NOT_FOUND',
+  DEVICE_OUT_OF_RANGE = 'BLE_DEVICE_OUT_OF_RANGE',
+  DEVICE_BUSY = 'BLE_DEVICE_BUSY',
+  ALREADY_CONNECTED = 'BLE_ALREADY_CONNECTED',
+
+  // Permission errors (200-299)
+  PERMISSION_DENIED = 'BLE_PERMISSION_DENIED',
+  BLUETOOTH_DISABLED = 'BLE_BLUETOOTH_DISABLED',
+  LOCATION_DISABLED = 'BLE_LOCATION_DISABLED',
+
+  // Communication errors (300-399)
+  COMMAND_FAILED = 'BLE_COMMAND_FAILED',
+  COMMAND_TIMEOUT = 'BLE_COMMAND_TIMEOUT',
+  INVALID_RESPONSE = 'BLE_INVALID_RESPONSE',
+  DEVICE_DISCONNECTED = 'BLE_DEVICE_DISCONNECTED',
+  SERVICE_NOT_FOUND = 'BLE_SERVICE_NOT_FOUND',
+  CHARACTERISTIC_NOT_FOUND = 'BLE_CHARACTERISTIC_NOT_FOUND',
+
+  // Authentication errors (400-499)
+  PIN_UNLOCK_FAILED = 'BLE_PIN_UNLOCK_FAILED',
+  AUTHENTICATION_FAILED = 'BLE_AUTHENTICATION_FAILED',
+
+  // WiFi configuration errors (500-599)
+  WIFI_CONFIG_FAILED = 'BLE_WIFI_CONFIG_FAILED',
+  WIFI_PASSWORD_INCORRECT = 'BLE_WIFI_PASSWORD_INCORRECT',
+  WIFI_NETWORK_NOT_FOUND = 'BLE_WIFI_NETWORK_NOT_FOUND',
+  WIFI_SCAN_IN_PROGRESS = 'BLE_WIFI_SCAN_IN_PROGRESS',
+  WIFI_INVALID_CREDENTIALS = 'BLE_WIFI_INVALID_CREDENTIALS',
+
+  // Sensor errors (600-699)
+  SENSOR_NOT_RESPONDING = 'BLE_SENSOR_NOT_RESPONDING',
+  SENSOR_REBOOT_FAILED = 'BLE_SENSOR_REBOOT_FAILED',
+  SENSOR_ATTACH_FAILED = 'BLE_SENSOR_ATTACH_FAILED',
+
+  // General errors (900-999)
+  UNKNOWN_ERROR = 'BLE_UNKNOWN_ERROR',
+  OPERATION_CANCELLED = 'BLE_OPERATION_CANCELLED',
+}
+
+/**
+ * Error severity levels for UI display
+ */
+export enum BLEErrorSeverity {
+  INFO = 'info',
+  WARNING = 'warning',
+  ERROR = 'error',
+  CRITICAL = 'critical',
+}
+
+/**
+ * Recovery action types
+ */
+export enum BLERecoveryAction {
+  RETRY = 'retry',
+  SKIP = 'skip',
+  CANCEL = 'cancel',
+  ENABLE_BLUETOOTH = 'enable_bluetooth',
+  ENABLE_LOCATION = 'enable_location',
+  GRANT_PERMISSIONS = 'grant_permissions',
+  MOVE_CLOSER = 'move_closer',
+  CHECK_SENSOR_POWER = 'check_sensor_power',
+  CHECK_WIFI_PASSWORD = 'check_wifi_password',
+  TRY_DIFFERENT_NETWORK = 'try_different_network',
+  CONTACT_SUPPORT = 'contact_support',
+}
+
+/**
+ * User-friendly error messages
+ */
+export const BLE_ERROR_MESSAGES: Record<BLEErrorCode, { title: string; message: string }> = {
+  // Connection errors
+  [BLEErrorCode.CONNECTION_FAILED]: {
+    title: 'Connection Failed',
+    message: 'Could not connect to the sensor. Make sure it is powered on and try again.',
+  },
+  [BLEErrorCode.CONNECTION_TIMEOUT]: {
+    title: 'Connection Timeout',
+    message: 'The sensor did not respond in time. Move closer and try again.',
+  },
+  [BLEErrorCode.CONNECTION_IN_PROGRESS]: {
+    title: 'Connection in Progress',
+    message: 'Already trying to connect to this sensor. Please wait.',
+  },
+  [BLEErrorCode.DEVICE_NOT_FOUND]: {
+    title: 'Sensor Not Found',
+    message: 'Could not find the sensor. Make sure it is powered on and nearby.',
+  },
+  [BLEErrorCode.DEVICE_OUT_OF_RANGE]: {
+    title: 'Sensor Out of Range',
+    message: 'The sensor is too far away. Move closer and try again.',
+  },
+  [BLEErrorCode.DEVICE_BUSY]: {
+    title: 'Sensor Busy',
+    message: 'The sensor is busy. Wait a moment and try again.',
+  },
+  [BLEErrorCode.ALREADY_CONNECTED]: {
+    title: 'Already Connected',
+    message: 'Already connected to this sensor.',
+  },
+
+  // Permission errors
+  [BLEErrorCode.PERMISSION_DENIED]: {
+    title: 'Permission Denied',
+    message: 'Bluetooth permission is required to connect to sensors. Please grant permission in Settings.',
+  },
+  [BLEErrorCode.BLUETOOTH_DISABLED]: {
+    title: 'Bluetooth Disabled',
+    message: 'Bluetooth is turned off. Please enable Bluetooth in your device settings.',
+  },
+  [BLEErrorCode.LOCATION_DISABLED]: {
+    title: 'Location Required',
+    message: 'Location access is required for Bluetooth scanning on Android. Please enable location services.',
+  },
+
+  // Communication errors
+  [BLEErrorCode.COMMAND_FAILED]: {
+    title: 'Command Failed',
+    message: 'Could not communicate with the sensor. Try reconnecting.',
+  },
+  [BLEErrorCode.COMMAND_TIMEOUT]: {
+    title: 'No Response',
+    message: 'The sensor did not respond. Make sure it is powered on and nearby.',
+  },
+  [BLEErrorCode.INVALID_RESPONSE]: {
+    title: 'Invalid Response',
+    message: 'Received an unexpected response from the sensor. Try again.',
+  },
+  [BLEErrorCode.DEVICE_DISCONNECTED]: {
+    title: 'Disconnected',
+    message: 'Lost connection to the sensor. Try reconnecting.',
+  },
+  [BLEErrorCode.SERVICE_NOT_FOUND]: {
+    title: 'Sensor Error',
+    message: 'The sensor may need a firmware update. Please contact support.',
+  },
+  [BLEErrorCode.CHARACTERISTIC_NOT_FOUND]: {
+    title: 'Sensor Error',
+    message: 'The sensor may need a firmware update. Please contact support.',
+  },
+
+  // Authentication errors
+  [BLEErrorCode.PIN_UNLOCK_FAILED]: {
+    title: 'Authentication Failed',
+    message: 'Could not unlock the sensor. Try reconnecting.',
+  },
+  [BLEErrorCode.AUTHENTICATION_FAILED]: {
+    title: 'Authentication Failed',
+    message: 'Sensor authentication failed. Try reconnecting.',
+  },
+
+  // WiFi configuration errors
+  [BLEErrorCode.WIFI_CONFIG_FAILED]: {
+    title: 'WiFi Setup Failed',
+    message: 'Could not configure WiFi on the sensor. Check your password and try again.',
+  },
+  [BLEErrorCode.WIFI_PASSWORD_INCORRECT]: {
+    title: 'Wrong Password',
+    message: 'The WiFi password is incorrect. Please check and try again.',
+  },
+  [BLEErrorCode.WIFI_NETWORK_NOT_FOUND]: {
+    title: 'Network Not Found',
+    message: 'WiFi network not found. Make sure the sensor is within range of your router.',
+  },
+  [BLEErrorCode.WIFI_SCAN_IN_PROGRESS]: {
+    title: 'Scanning',
+    message: 'WiFi scan is in progress. Please wait a moment and try again.',
+  },
+  [BLEErrorCode.WIFI_INVALID_CREDENTIALS]: {
+    title: 'Invalid Credentials',
+    message: 'The network name or password contains invalid characters.',
+  },
+
+  // Sensor errors
+  [BLEErrorCode.SENSOR_NOT_RESPONDING]: {
+    title: 'Sensor Not Responding',
+    message: 'The sensor is not responding. Check if it is powered on.',
+  },
+  [BLEErrorCode.SENSOR_REBOOT_FAILED]: {
+    title: 'Reboot Failed',
+    message: 'Could not reboot the sensor. Try again or power cycle manually.',
+  },
+  [BLEErrorCode.SENSOR_ATTACH_FAILED]: {
+    title: 'Registration Failed',
+    message: 'Could not register the sensor. Check your internet connection.',
+  },
+
+  // General errors
+  [BLEErrorCode.UNKNOWN_ERROR]: {
+    title: 'Error',
+    message: 'An unexpected error occurred. Please try again.',
+  },
+  [BLEErrorCode.OPERATION_CANCELLED]: {
+    title: 'Cancelled',
+    message: 'Operation was cancelled.',
+  },
+};
+
+/**
+ * Map error codes to suggested recovery actions
+ */
+export const BLE_RECOVERY_ACTIONS: Record<BLEErrorCode, BLERecoveryAction[]> = {
+  // Connection errors
+  [BLEErrorCode.CONNECTION_FAILED]: [BLERecoveryAction.RETRY, BLERecoveryAction.MOVE_CLOSER, BLERecoveryAction.CHECK_SENSOR_POWER],
+  [BLEErrorCode.CONNECTION_TIMEOUT]: [BLERecoveryAction.RETRY, BLERecoveryAction.MOVE_CLOSER],
+  [BLEErrorCode.CONNECTION_IN_PROGRESS]: [],
+  [BLEErrorCode.DEVICE_NOT_FOUND]: [BLERecoveryAction.RETRY, BLERecoveryAction.CHECK_SENSOR_POWER],
+  [BLEErrorCode.DEVICE_OUT_OF_RANGE]: [BLERecoveryAction.MOVE_CLOSER, BLERecoveryAction.RETRY],
+  [BLEErrorCode.DEVICE_BUSY]: [BLERecoveryAction.RETRY],
+  [BLEErrorCode.ALREADY_CONNECTED]: [],
+
+  // Permission errors
+  [BLEErrorCode.PERMISSION_DENIED]: [BLERecoveryAction.GRANT_PERMISSIONS],
+  [BLEErrorCode.BLUETOOTH_DISABLED]: [BLERecoveryAction.ENABLE_BLUETOOTH],
+  [BLEErrorCode.LOCATION_DISABLED]: [BLERecoveryAction.ENABLE_LOCATION],
+
+  // Communication errors
+  [BLEErrorCode.COMMAND_FAILED]: [BLERecoveryAction.RETRY, BLERecoveryAction.SKIP],
+  [BLEErrorCode.COMMAND_TIMEOUT]: [BLERecoveryAction.RETRY, BLERecoveryAction.MOVE_CLOSER],
+  [BLEErrorCode.INVALID_RESPONSE]: [BLERecoveryAction.RETRY, BLERecoveryAction.CONTACT_SUPPORT],
+  [BLEErrorCode.DEVICE_DISCONNECTED]: [BLERecoveryAction.RETRY],
+  [BLEErrorCode.SERVICE_NOT_FOUND]: [BLERecoveryAction.CONTACT_SUPPORT],
+  [BLEErrorCode.CHARACTERISTIC_NOT_FOUND]: [BLERecoveryAction.CONTACT_SUPPORT],
+
+  // Authentication errors
+  [BLEErrorCode.PIN_UNLOCK_FAILED]: [BLERecoveryAction.RETRY, BLERecoveryAction.SKIP],
+  [BLEErrorCode.AUTHENTICATION_FAILED]: [BLERecoveryAction.RETRY, BLERecoveryAction.SKIP],
+
+  // WiFi configuration errors
+  [BLEErrorCode.WIFI_CONFIG_FAILED]: [BLERecoveryAction.RETRY, BLERecoveryAction.CHECK_WIFI_PASSWORD],
+  [BLEErrorCode.WIFI_PASSWORD_INCORRECT]: [BLERecoveryAction.CHECK_WIFI_PASSWORD, BLERecoveryAction.RETRY],
+  [BLEErrorCode.WIFI_NETWORK_NOT_FOUND]: [BLERecoveryAction.TRY_DIFFERENT_NETWORK, BLERecoveryAction.MOVE_CLOSER],
+  [BLEErrorCode.WIFI_SCAN_IN_PROGRESS]: [BLERecoveryAction.RETRY],
+  [BLEErrorCode.WIFI_INVALID_CREDENTIALS]: [BLERecoveryAction.TRY_DIFFERENT_NETWORK],
+
+  // Sensor errors
+  [BLEErrorCode.SENSOR_NOT_RESPONDING]: [BLERecoveryAction.CHECK_SENSOR_POWER, BLERecoveryAction.RETRY],
+  [BLEErrorCode.SENSOR_REBOOT_FAILED]: [BLERecoveryAction.RETRY, BLERecoveryAction.SKIP],
+  [BLEErrorCode.SENSOR_ATTACH_FAILED]: [BLERecoveryAction.RETRY, BLERecoveryAction.SKIP],
+
+  // General errors
+  [BLEErrorCode.UNKNOWN_ERROR]: [BLERecoveryAction.RETRY, BLERecoveryAction.CANCEL],
+  [BLEErrorCode.OPERATION_CANCELLED]: [],
+};
+
+/**
+ * Custom BLE Error class with rich metadata
+ */
+export class BLEError extends Error {
+  public readonly code: BLEErrorCode;
+  public readonly severity: BLEErrorSeverity;
+  public readonly recoveryActions: BLERecoveryAction[];
+  public readonly userMessage: { title: string; message: string };
+  public readonly deviceId?: string;
+  public readonly deviceName?: string;
+  public readonly timestamp: number;
+  public readonly originalError?: Error;
+
+  constructor(
+    code: BLEErrorCode,
+    options?: {
+      message?: string;
+      deviceId?: string;
+      deviceName?: string;
+      originalError?: Error;
+      severity?: BLEErrorSeverity;
+    }
+  ) {
+    const userMessage = BLE_ERROR_MESSAGES[code] || BLE_ERROR_MESSAGES[BLEErrorCode.UNKNOWN_ERROR];
+    const technicalMessage = options?.message || options?.originalError?.message || userMessage.message;
+
+    super(technicalMessage);
+
+    this.name = 'BLEError';
+    this.code = code;
+    this.severity = options?.severity || getSeverityForErrorCode(code);
+    this.recoveryActions = BLE_RECOVERY_ACTIONS[code] || [];
+    this.userMessage = userMessage;
+    this.deviceId = options?.deviceId;
+    this.deviceName = options?.deviceName;
+    this.timestamp = Date.now();
+    this.originalError = options?.originalError;
+
+    // Ensure proper prototype chain
+    Object.setPrototypeOf(this, BLEError.prototype);
+  }
+
+  /**
+   * Get formatted error for logging
+   */
+  toLogString(): string {
+    const parts = [
+      `[BLE] [${this.code}]`,
+      this.deviceName ? `[${this.deviceName}]` : this.deviceId ? `[${this.deviceId}]` : '',
+      this.message,
+    ];
+    return parts.filter(Boolean).join(' ');
+  }
+
+  /**
+   * Check if error is retryable
+   */
+  isRetryable(): boolean {
+    return this.recoveryActions.includes(BLERecoveryAction.RETRY);
+  }
+
+  /**
+   * Check if error can be skipped (for batch operations)
+   */
+  isSkippable(): boolean {
+    return this.recoveryActions.includes(BLERecoveryAction.SKIP);
+  }
+}
+
+/**
+ * Determine error severity based on error code
+ */
+function getSeverityForErrorCode(code: BLEErrorCode): BLEErrorSeverity {
+  // Critical: Cannot proceed without user action
+  if ([
+    BLEErrorCode.PERMISSION_DENIED,
+    BLEErrorCode.BLUETOOTH_DISABLED,
+    BLEErrorCode.LOCATION_DISABLED,
+  ].includes(code)) {
+    return BLEErrorSeverity.CRITICAL;
+  }
+
+  // Error: Operation failed but may be recoverable
+  if ([
+    BLEErrorCode.CONNECTION_FAILED,
+    BLEErrorCode.CONNECTION_TIMEOUT,
+    BLEErrorCode.WIFI_PASSWORD_INCORRECT,
+    BLEErrorCode.WIFI_CONFIG_FAILED,
+    BLEErrorCode.PIN_UNLOCK_FAILED,
+    BLEErrorCode.SENSOR_NOT_RESPONDING,
+  ].includes(code)) {
+    return BLEErrorSeverity.ERROR;
+  }
+
+  // Warning: Minor issue, may resolve automatically
+  if ([
+    BLEErrorCode.DEVICE_BUSY,
+    BLEErrorCode.WIFI_SCAN_IN_PROGRESS,
+    BLEErrorCode.CONNECTION_IN_PROGRESS,
+  ].includes(code)) {
+    return BLEErrorSeverity.WARNING;
+  }
+
+  // Info: Expected states
+  if ([
+    BLEErrorCode.ALREADY_CONNECTED,
+    BLEErrorCode.OPERATION_CANCELLED,
+  ].includes(code)) {
+    return BLEErrorSeverity.INFO;
+  }
+
+  return BLEErrorSeverity.ERROR;
+}
+
+/**
+ * Parse native BLE error and convert to BLEError
+ */
+export function parseBLEError(
+  error: unknown,
+  context?: {
+    deviceId?: string;
+    deviceName?: string;
+    operation?: string;
+  }
+): BLEError {
+  const originalError = error instanceof Error ? error : new Error(String(error));
+  const message = originalError.message?.toLowerCase() || '';
+
+  // Extract error code from message (format: [CODE] message)
+  const codeMatch = originalError.message?.match(/^\[(\w+)\]/);
+  const extractedCode = codeMatch?.[1];
+
+  // Permission/Bluetooth errors
+  if (message.includes('permission') || message.includes('not granted')) {
+    return new BLEError(BLEErrorCode.PERMISSION_DENIED, {
+      ...context,
+      originalError,
+    });
+  }
+
+  if (message.includes('bluetooth') && (message.includes('disabled') || message.includes('off'))) {
+    return new BLEError(BLEErrorCode.BLUETOOTH_DISABLED, {
+      ...context,
+      originalError,
+    });
+  }
+
+  if (message.includes('location') && (message.includes('disabled') || message.includes('required'))) {
+    return new BLEError(BLEErrorCode.LOCATION_DISABLED, {
+      ...context,
+      originalError,
+    });
+  }
+
+  // Connection errors
+  if (message.includes('timeout')) {
+    return new BLEError(BLEErrorCode.CONNECTION_TIMEOUT, {
+      ...context,
+      originalError,
+    });
+  }
+
+  if (message.includes('already in progress')) {
+    return new BLEError(BLEErrorCode.CONNECTION_IN_PROGRESS, {
+      ...context,
+      originalError,
+    });
+  }
+
+  if (message.includes('not found') && message.includes('device')) {
+    return new BLEError(BLEErrorCode.DEVICE_NOT_FOUND, {
+      ...context,
+      originalError,
+    });
+  }
+
+  if (message.includes('disconnect') || message.includes('not connected')) {
+    return new BLEError(BLEErrorCode.DEVICE_DISCONNECTED, {
+      ...context,
+      originalError,
+    });
+  }
+
+  // WiFi errors
+  if (message.includes('password') && (message.includes('incorrect') || message.includes('wrong'))) {
+    return new BLEError(BLEErrorCode.WIFI_PASSWORD_INCORRECT, {
+      ...context,
+      originalError,
+    });
+  }
+
+  if (message.includes('network') && message.includes('not found')) {
+    return new BLEError(BLEErrorCode.WIFI_NETWORK_NOT_FOUND, {
+      ...context,
+      originalError,
+    });
+  }
+
+  if (message.includes('wifi') && message.includes('scan') && message.includes('progress')) {
+    return new BLEError(BLEErrorCode.WIFI_SCAN_IN_PROGRESS, {
+      ...context,
+      originalError,
+    });
+  }
+
+  if (message.includes('invalid character')) {
+    return new BLEError(BLEErrorCode.WIFI_INVALID_CREDENTIALS, {
+      ...context,
+      originalError,
+    });
+  }
+
+  // PIN/Authentication errors
+  if (message.includes('unlock') || message.includes('pin')) {
+    return new BLEError(BLEErrorCode.PIN_UNLOCK_FAILED, {
+      ...context,
+      originalError,
+    });
+  }
+
+  // Sensor not responding
+  if (message.includes('not responding') || message.includes('no response')) {
+    return new BLEError(BLEErrorCode.SENSOR_NOT_RESPONDING, {
+      ...context,
+      originalError,
+    });
+  }
+
+  // Cancelled operation (Android errorCode 2)
+  if (message.includes('cancelled') || extractedCode === '2') {
+    return new BLEError(BLEErrorCode.OPERATION_CANCELLED, {
+      ...context,
+      originalError,
+    });
+  }
+
+  // Service/Characteristic not found
+  if (message.includes('service') && message.includes('not found')) {
+    return new BLEError(BLEErrorCode.SERVICE_NOT_FOUND, {
+      ...context,
+      originalError,
+    });
+  }
+
+  if (message.includes('characteristic') && message.includes('not found')) {
+    return new BLEError(BLEErrorCode.CHARACTERISTIC_NOT_FOUND, {
+      ...context,
+      originalError,
+    });
+  }
+
+  // Default to connection failed for unrecognized errors
+  if (message.includes('connect') || message.includes('connection')) {
+    return new BLEError(BLEErrorCode.CONNECTION_FAILED, {
+      ...context,
+      originalError,
+    });
+  }
+
+  // Unknown error
+  return new BLEError(BLEErrorCode.UNKNOWN_ERROR, {
+    message: originalError.message,
+    ...context,
+    originalError,
+  });
+}
+
+/**
+ * Check if an error is a BLEError
+ */
+export function isBLEError(error: unknown): error is BLEError {
+  return error instanceof BLEError;
+}
+
+/**
+ * Get user-friendly error info from any error
+ */
+export function getErrorInfo(error: unknown): {
+  code: BLEErrorCode;
+  title: string;
+  message: string;
+  severity: BLEErrorSeverity;
+  recoveryActions: BLERecoveryAction[];
+  isRetryable: boolean;
+} {
+  if (isBLEError(error)) {
+    return {
+      code: error.code,
+      title: error.userMessage.title,
+      message: error.userMessage.message,
+      severity: error.severity,
+      recoveryActions: error.recoveryActions,
+      isRetryable: error.isRetryable(),
+    };
+  }
+
+  const parsedError = parseBLEError(error);
+  return {
+    code: parsedError.code,
+    title: parsedError.userMessage.title,
+    message: parsedError.userMessage.message,
+    severity: parsedError.severity,
+    recoveryActions: parsedError.recoveryActions,
+    isRetryable: parsedError.isRetryable(),
+  };
+}
+
+/**
+ * Get localized action button text for recovery actions
+ */
+export function getRecoveryActionLabel(action: BLERecoveryAction): string {
+  switch (action) {
+    case BLERecoveryAction.RETRY:
+      return 'Retry';
+    case BLERecoveryAction.SKIP:
+      return 'Skip';
+    case BLERecoveryAction.CANCEL:
+      return 'Cancel';
+    case BLERecoveryAction.ENABLE_BLUETOOTH:
+      return 'Enable Bluetooth';
+    case BLERecoveryAction.ENABLE_LOCATION:
+      return 'Enable Location';
+    case BLERecoveryAction.GRANT_PERMISSIONS:
+      return 'Grant Permission';
+    case BLERecoveryAction.MOVE_CLOSER:
+      return 'Move Closer';
+    case BLERecoveryAction.CHECK_SENSOR_POWER:
+      return 'Check Sensor';
+    case BLERecoveryAction.CHECK_WIFI_PASSWORD:
+      return 'Check Password';
+    case BLERecoveryAction.TRY_DIFFERENT_NETWORK:
+      return 'Try Different Network';
+    case BLERecoveryAction.CONTACT_SUPPORT:
+      return 'Contact Support';
+    default:
+      return 'OK';
+  }
+}
+
+/**
+ * BLE Logger for consistent logging format
+ */
+export class BLELogger {
+  private static enabled = true;
+  private static prefix = '[BLE]';
+
+  static enable(): void {
+    BLELogger.enabled = true;
+  }
+
+  static disable(): void {
+    BLELogger.enabled = false;
+  }
+
+  static log(message: string, data?: any): void {
+    if (!BLELogger.enabled) return;
+    console.log(`${BLELogger.prefix} ${message}`, data !== undefined ? data : '');
+  }
+
+  static warn(message: string, data?: any): void {
+    if (!BLELogger.enabled) return;
+    console.warn(`${BLELogger.prefix} ${message}`, data !== undefined ? data : '');
+  }
+
+  static error(message: string, error?: any): void {
+    if (!BLELogger.enabled) return;
+    if (isBLEError(error)) {
+      console.error(`${BLELogger.prefix} ${error.toLogString()}`);
+    } else {
+      console.error(`${BLELogger.prefix} ${message}`, error !== undefined ? error : '');
+    }
+  }
+
+  /**
+   * Log batch operation progress
+   */
+  static logBatchProgress(
+    index: number,
+    total: number,
+    deviceName: string,
+    step: string,
+    success?: boolean,
+    duration?: number
+  ): void {
+    if (!BLELogger.enabled) return;
+
+    const status = success === undefined ? '●' : success ? '✓' : '✗';
+    const durationStr = duration !== undefined ? ` (${(duration / 1000).toFixed(1)}s)` : '';
+
+    console.log(`${BLELogger.prefix} [${index}/${total}] ${deviceName} — ${status} ${step}${durationStr}`);
+  }
+
+  /**
+   * Log batch operation summary
+   */
+  static logBatchSummary(
+    total: number,
+    succeeded: number,
+    failed: number,
+    duration: number
+  ): void {
+    if (!BLELogger.enabled) return;
+
+    console.log(`${BLELogger.prefix} Batch complete: ${succeeded}/${total} succeeded, ${failed} failed (${(duration / 1000).toFixed(1)}s)`);
+  }
+}
diff --git a/services/ble/index.ts b/services/ble/index.ts
index 42ec2dc..8ed057f 100644
--- a/services/ble/index.ts
+++ b/services/ble/index.ts
@@ -63,3 +63,6 @@ export * from './types';
 
 // Re-export permission utilities
 export * from './permissions';
+
+// Re-export error types and utilities
+export * from './errors';