在 HCI0 中连接的 BlueZ-pyDbus 2 客户端

Question

我已通过 pyDbus 同时成功连接到 2 个 BLE 服务器。但是，当我想读/写第一个 BLE 服务器时，我无法这样做。我检查了这个问题，发现第二个 BLE 服务器连接克服了第一个。附上一段sn-p的代码：

def device_Init(macAdd):

     adapter = bus.get('org.bluez','/org/bluez/hci0')
     dev = bus.get('org.bluez','/dev_(the macAdd)')
     mngr = bus.get('org.bluez','/')
    
     dev.Connect()

当然，当需要断开连接时，请发出dev.Disconnect()

如何分离两个连接设备之间的连接、读/写和断开部分？我尝试创建另一个函数但没有成功。

Answer 1

您的代码的问题在于，当您使用不同的设备地址再次创建 dev 属性时，它会被覆盖。您可以为第二个设备设置第二个变量。

然而，一个更 Pythonic 的方式可能是有一个你实例化两次的类。

这是一个示例：

from time import sleep
import pydbus

bus = pydbus.SystemBus()

mngr = bus.get('org.bluez', '/')

def get_characteristic_path(dev_path, uuid):
    mng_objs = mngr.GetManagedObjects()
    for path in mng_objs:
        chr_uuid = mng_objs[path].get('org.bluez.GattCharacteristic1', {}).get('UUID')
        if path.startswith(dev_path) and chr_uuid == uuid:
           return path

class MyRemoteDevice:
    CHAR_UUID = 'e95dda90-251d-470a-a062-fa1922dfa9a8'

    def __init__(self, mac_addr):
        device_path = f"/org/bluez/hci0/dev_{mac_addr.replace(':', '_')}"
        self.device = bus.get('org.bluez', device_path)

        # Placeholder for characteristic details
        self.characteristic = None

    def _get_gatt_details(self):
        char_path = get_characteristic_path(self.device._path,
                                            MyRemoteDevice.CHAR_UUID)
        self.characteristic = bus.get('org.bluez', char_path)


    def connect(self):
        self.device.Connect()
        # Check GATT services have been resolved before continuing
        while not self.device.ServicesResolved:
            sleep(0.25)
        self._get_gatt_details()

    def disconnect(self):
        self.device.Disconnect()

    def read(self):
        return self.characteristic.ReadValue({})

    def write(self, new_value):
        self.characteristic.WriteValue(new_value, {})


my_first_dev = MyRemoteDevice('11:22:33:44:55:66')
my_second_dev = MyRemoteDevice('22:33:44:55:66:77')

my_first_dev.connect()
my_second_dev.connect()

print(my_first_dev.read())
print(my_second_dev.read())

my_first_dev.disconnect()
my_second_dev.disconnect()