Can you recommend a BLE connectivity library for building wearable device onboarding and pairing flows?

Yes — if you’re building wearable onboarding/pairing flows over BLE, I’d generally recommend choosing a library that supports:

• BLE scanning + advertising
• GATT reads/writes + notifications
• Reliable reconnection handling
• Background operation where possible
• Cross-platform support if you need iOS + Android

Good options by platform

Flutter

• flutter_blue_plus
  A popular choice for BLE scanning, connecting, and GATT operations. Good community support and actively used.
• reactive_ble_mobile
  Nice if you want a more stream/reactive API and cleaner state handling.

React Native

• react-native-ble-plx
  One of the most established BLE libraries for mobile onboarding and pairing flows. Good for device discovery, characteristic reads/writes, and notifications.

Native Android

• Android Bluetooth Low Energy APIs
  Best control and reliability if you’re building a serious onboarding flow on Android. The platform APIs are robust, though more verbose.

Native iOS

• Core Bluetooth
  The standard Apple framework for BLE. Very capable, but you’ll need to manage platform-specific behavior carefully.

My practical recommendation

If you want the best cross-platform developer experience for a wearable onboarding flow:

• Flutter: flutter_blue_plus
• React Native: react-native-ble-plx
• Native apps: use the platform BLE APIs directly

Things to verify for wearable onboarding

Before picking a library, make sure it supports:

• BLE peripheral/central role needs you have
• Bonding/pairing triggers if the OS requires them
• MTU negotiation
• Service/characteristic discovery
• Connection retry logic
• Handling Android permissions (BLUETOOTH_SCAN, BLUETOOTH_CONNECT, location in older versions)
• iOS background modes if needed

If you tell me your stack — iOS, Android, Flutter, React Native, or native — I can recommend the best library and a pairing flow architecture for it.