tracelet_sync 3.2.7

Offline SQLite persistence and automatic HTTP synchronization engine for Tracelet.

tracelet_sync

Offline SQLite persistence and automatic HTTP synchronization engine for Tracelet.

This package automatically handles saving location data to a local SQLite database and securely synchronizing it with your backend server, ensuring no location data is lost during network outages or app terminations.

Features

• Offline Persistence: Automatically persists GPS coordinates, motion state, and battery metrics to a local SQLite database.
• Automatic HTTP Synchronization: Syncs locations to your backend automatically when network connectivity is available.
• Batch Synchronization: Group multiple location records into a single HTTP request to minimize network overhead and battery drain.
• Delta Compression (enableDeltaCompression): Drops redundant JSON headers and applies delta encoding to coordinates, yielding up to an 80% reduction in payload size.
• Enterprise Security (SSL Pinning): Secure your HTTP payloads against Man-In-The-Middle (MITM) attacks by pinning SHA-256 fingerprints or full Base64 SSL certificates.
• Cellular Data Awareness: Option to disable auto-syncing over cellular networks (disableAutoSyncOnCellular) to save user data plans, falling back to Wi-Fi only.
• Exponential Backoff & Retry: Built-in resilience against transient network failures (5xx, 429 timeouts) with configurable maximum retries and exponential backoff caps.

Getting Started

To add offline storage and HTTP synchronization to Tracelet, simply add this package to your pubspec.yaml:

dependencies:
  tracelet: ^3.2.0
  tracelet_sync: ^3.2.0

Once added, Tracelet will automatically detect the sync engine and securely persist locations offline during network outages, syncing them when connectivity is restored.

Configuration Example

The sync engine uses the http configuration provided to the core Tracelet plugin.

import 'package:tracelet/tracelet.dart';

void startTracking() async {
  await Tracelet.setConfig(Config(
    http: HttpConfig(
      url: 'https://your-backend.com/api/locations',
      method: HttpMethod.post,
      headers: {'Authorization': 'Bearer YOUR_TOKEN'},
      batchSync: true,
      maxBatchSize: 250,
      autoSyncThreshold: 10,
      enableDeltaCompression: true,
      disableAutoSyncOnCellular: false,
      maxRetries: 3,
      retryBackoffBase: 1000,
      retryBackoffCap: 60000,
      sslPinningFingerprints: [
        'sha256/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX='
      ],
    ),
  ));

  await Tracelet.start();
}