gatt_linux.py 文件源码

def read_value(self, offset=0):
        """
        Reads the value of this characteristic.

        When successful, `characteristic_value_updated()` of the related device will be called,
        otherwise `characteristic_read_value_failed()` is invoked.
        """
        try:
            return self._object.ReadValue(
                {'offset': dbus.UInt16(offset, variant_level=1)},
                dbus_interface='org.bluez.GattCharacteristic1')
        except dbus.exceptions.DBusException as e:
            error = _error_from_dbus_error(e)
            self.service.device.characteristic_read_value_failed(self, error=error)