当尝试通过BLE将RPI3B+与飞利浦色调灯连接时，pygatt在char_read（）调用期间失败

Question

描述

所以，我试着用我的覆盆子皮3B+型号通过BLE连接到飞利浦色调灯。因此，我使用pygatt库编写了以下python脚本

代码

import pygatt

ADDRESS_TYPE = pygatt.BLEAddressType.random
CHARACTERISTIC = '932c32bd-0002-47a2-835a-a8d455b859dd'

adapter = pygatt.GATTToolBackend()

try:
    adapter.start()
    devices = adapter.scan(run_as_root=True, timeout=3)
    for entry in devices:
        if entry['name'] == 'Hue Lamp':
            try:
                device = adapter.connect(entry['address'], address_type=ADDRESS_TYPE)
                device.char_write(CHARACTERISTIC, bytearray([0x00]), wait_for_response=False)
                value = device.char_read(CHARACTERISTIC)
                device.disconnect()
            except pygatt.exceptions.NotConnectedError:
                print('Failed to connect to %s' % entry['address'])
finally:
    adapter.stop()

代码的行为

当我运行脚本时，似乎成功地建立了连接。char_write()调用应该关闭指示灯，但什么也没发生。char_read()调用引发了一个异常，如下所述

异常回溯

Traceback (most recent call last):
  File "main.py", line 21, in <module>
    value = device.char_read(CHARACTERISTIC)
  File "/usr/local/lib/python3.7/dist-packages/pygatt/backends/gatttool/device.py", line 17, in wrapper
    return func(self, *args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/pygatt/backends/gatttool/device.py", line 40, in char_read
    return self._backend.char_read(self, uuid, *args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/pygatt/backends/gatttool/gatttool.py", line 50, in wrapper
    return func(self, *args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/pygatt/backends/gatttool/gatttool.py", line 593, in char_read
    self.sendline('char-read-uuid %s' % uuid)
  File "/usr/lib/python3.7/contextlib.py", line 119, in __exit__
    next(self.gen)
  File "/usr/local/lib/python3.7/dist-packages/pygatt/backends/gatttool/gatttool.py", line 191, in event
    self.wait(event, timeout)
  File "/usr/local/lib/python3.7/dist-packages/pygatt/backends/gatttool/gatttool.py", line 157, in wait
    raise NotificationTimeout()
pygatt.exceptions.NotificationTimeout: None

注

我可以用pygatt读出灯的可调谐特性。我还可以通过NRF Connect Android应用程序控制灯。当我用app向上述特性写入值0x00时，灯会按预期关闭