Web蓝牙通知仅有少量响应

Question

我正在学习使用web蓝牙api来编写web应用程序，并使用铬/铬运行它。但是通知只响应了几次，我不知道为什么和如何调试它(看看发生了什么)。

蓝牙外设是血氧仪，使用蓝牙发送实时spo2、心率等。我的浏览器使用的是基于Debian9.1构建的Chromium 60.0.3112.78，运行在Debian9.1 (64位)上。

下面是我的javascript：

var serviceUuid = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
characteristicUuid = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" ;
// Sorry, I hide the UUID.


document.querySelector('#button').addEventListener('click', function(event) {
    onStartButtonClick();
    }});

async function onStartButtonClick(){
    let options = {};
    options.acceptAllDevices = true;
    options.optionalServices = [serviceUuid];
    try{
        const device = await navigator.bluetooth.requestDevice(options);
        device.addEventListener('gattserverdisconnected', onDisconnected);
        console.log('Got device:', device.name);
        console.log('id:', device.id);

        console.log('Connecting to GATT Server...');
        const server = await device.gatt.connect();

        console.log('Getting Service...');
        const service = await server.getPrimaryService(serviceUuid);

        console.log('Getting Characteristic...');
        myCharacteristic = await service.getCharacteristic(characteristicUuid);

        myCharacteristic.addEventListener('characteristicvaluechanged',
            handleNotifications);
        await myCharacteristic.startNotifications();
        console.log('> Notifications started');
    } catch(error) {
        console.log('Argh! ' + error);
    }
}
async function disconnect(){
    await myCharacteristic.stopNotifications();
    onDisconnected();
}

function onDisconnected(event) {
  // Object event.target is Bluetooth Device getting disconnected.
  console.log('> Bluetooth Device disconnected');
}

var tmp_count=0;

async function handleNotifications(event) {
    // I will read data by Uint8Array.
    // var databuf = new Uint8Array(event.target.value.buffer);
    tmp_count++;
    console.log(tmp_count);
}

铬显示控制台：

03:41:49.893 (index):192 Connecting to GATT Server...
03:41:50.378 (index):195 Getting Service...
03:41:51.237 (index):198 Getting Characteristic...
03:41:51.359 (index):204 > Notifications started
03:41:51.781 (index):228 1
03:41:51.782 (index):228 2
03:42:22.573 (index):217 > Bluetooth Device disconnected

03:41:51.782 (index):228 2之后没有反应，所以我关闭了血氧计。

问题出在哪里？我能做些什么呢？谢谢。

Answer 1

首先，请注意此时的Chrome supports Android, Chrome OS, macOS。

尝试使用chrome://bluetooth-internals、nRF Connect for Android或nRF Connect for iOS等https://www.chromium.org/developers/how-tos/file-web-bluetooth-bugs上的一些提示

如果你可以在这些应用程序中连续收到通知，但在Chrome中却不能，那一定是个bug。请将有关如何重现它的详细信息以及您收集的日志归档到以下位置：https://crbug.com/new