网络蓝牙通知只有很少的回应

问题描述：

我正在学习使用网络蓝牙api来编写web应用程序，并使用铬/铬运行它。但通知只响应几次，我不知道为什么以及如何调试它（看看发生了什么）。网络蓝牙通知只有很少的回应

蓝牙外设是血氧仪，使用BLE发送实时血氧饱和度，心率等。我的浏览器使用基于Debian 9.1（基于Debian 9.1（64位））运行的Chromium 60.0.3112.78。

下面是我的javascript：

铬显示

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); 
}

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

这03:41:51.782 (index):228 2后没有任何反应，所以我把关闭血氧仪。

什么问题？我能做什么？谢谢。

答

首先，请注意Chrome supports Android, Chrome OS, macOS在这个时候。

尝试使用一些技巧上https://www.chromium.org/developers/how-tos/file-web-bluetooth-bugs如chrome://bluetooth-internals， nRF Connect for Android或nRF Connect for iOS

如果你能在这些应用程序不断接受通知，但无法在Chrome中，有一个错误。请详细说明如何复制它，您收集的日志，有：https://crbug.com/new

网络蓝牙通知只有很少的回应

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