javascript - JavaScript 中的 BLE 广告扫描

Question

从附近的低功耗蓝牙设备扫描广告是我的首要任务。我试过的代码请求了设备(它想配对以获得特性)。但我的用例是听他们的广告。为此我找到了这段代码

function recordNearbyBeacon(major, minor, pathLossVs1m) { ... }
navigator.bluetooth.requestLEScan({
  filters: [{manufacturerData: {0x004C: {dataPrefix: new Uint8Array([
    0x02, 0x15, // iBeacon identifier.
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15  // My beacon UUID.
  ])}}}],
  options: {
    keepRepeatedDevices: true,
  }
}).then(() => {
  navigator.bluetooth.addEventListener('advertisementreceived', event => {
    let appleData = event.manufacturerData.get(0x004C);
    if (appleData.byteLength != 23) {
      // Isn’t an iBeacon.
      return;
    }
    let major = appleData.getUint16(18, false);
    let minor = appleData.getUint16(20, false);
    let txPowerAt1m = -appleData.getInt8(22);
    let pathLossVs1m = txPowerAt1m - event.rssi;

    recordNearbyBeacon(major, minor, pathLossVs1m);
  });
})

我试过官方站点中的某些 uuid，但似乎都不起作用。我想从广告数据中获取特征值。如何在 Javascript 中获取数据？提前致谢。

Answer 1

根据implementation status来自 Web Bluetooth GitHub 的文档，Web Bluetooth Scanning API (它提供了 requestLEScan 方法)尚未在任何浏览器中实现。