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Developer details how to sync BLE firmware between a smartwatch and React Native app

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A developer building a React Native app for a custom smartwatch has shared the technical approach used to establish and maintain a Bluetooth Low Energy connection. The setup relies on react-native-ble-manager and a custom hook called useBleManager to handle scanning, pairing, and communication with the watch's UART-style BLE service. A structured handshake packet, built using a custom buildPayload function with checksum validation, must be sent to the firmware immediately after notifications are enabled to signal that the phone is ready. Deliberate delays are built into the connection sequence because BLE requires brief pauses after certain operations to function reliably. The app also handles unexpected disconnections automatically by detecting drops through a listener and triggering a retry connection flow.

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Developer details how to sync BLE firmware between a smartwatch and React Native app · ShortSingh