Web Bluetooth GATT 数据采集与 IndexedDB 持久化实践

概述Web Bluetooth 支持连接 BLE 设备并读取特征。本文提供订阅数据变化与持久化示例。能力检测与订阅const supportsBT = !!navigator.bluetooth; async function subscribeCharacteristic(serviceUUID, charUUID, onData) { const dev = await navigator.bluetooth.requestDevice({ filters: [{ services: [serviceUUID] }] }); const server = await dev.gatt.connect(); const service = await server.getPrimaryService(serviceUUID); const char = await service.getCharacteristic(charUUID); await char.startNotifications(); char.addEventListener('characteristicvaluechanged', e => { onData(new Uint8Array(e.target.value.buffer)); }); } IndexedDB 持久化function openDB(name) { return new Promise((resolve, reject) => { const r = indexedDB.open(name, 1); r.onupgradeneeded = () => { const db = r.result; if (!db.objectStoreNames.contains('ble')) db.createObjectStore('ble', { autoIncrement: true }); }; r.onsuccess = () => resolve(r.result); r.onerror = () => reject(r.error); }); } async function saveBle(bytes) { const db = await openDB('ble'); const tx = db.transaction('ble', 'readwrite'); tx.objectStore('ble').add(Array.from(bytes)); await new Promise((resolve, reject) => { tx.oncomplete = resolve; tx.onerror = () => reject(tx.error); }); db.close(); }