（Web蓝牙）：无法连接到蓝牙打印机的GATT服务器

Question

我正在尝试显示GATT服务器中服务的所有特征。这是代码...

    navigator.bluetooth.requestDevice({
   filters: [{
    services: ['00001101-0000-1000-8000-00805f9b34fb']
}]})
  .then(device => {
    console.log('Connecting to GATT Server...');
    return device.gatt.connect();
  })
  .then(server => {
    console.log('Getting Services...');
    return server.getPrimaryServices();
  })
  .then(services => {
    console.log('Getting Characteristics...');
    let queue = Promise.resolve();
    services.forEach(service => {
      queue = queue.then(_ => service.getCharacteristics().then(characteristics => {
        console.log('> Service: ' + service.uuid);
        characteristics.forEach(characteristic => {
          console.log('>> Characteristic: ' + characteristic.uuid + ' ' +
              getSupportedProperties(characteristic));
        });
      }));
    });
    return queue;
  })
  .catch(error => {
    console.log('Argh! ' + error);
  });

代码一直运行，直到它在第6行上将Connecting to GATT Server...记录到控制台，并且不会继续打印下一个日志，这意味着device.gatt.connect()在第7行上有问题。代码似乎正确，这可能是设备出现问题吗？有解决方案或建议吗？