Synopsis¶

Methods¶

def __init__()
def isValid()
def name()
def __ne__()
def __eq__()
def type()
def uuid()
def value()

Note

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Detailed Description¶

QLowEnergyDescriptor provides information about a Bluetooth Low Energy descriptor’s name() , uuid() , and value() . Descriptors are encapsulated by Bluetooth Low Energy characteristics and provide additional contextual information about the characteristic (data format, notification activation and so on).

The descriptor value may be written via the QLowEnergyService instance that manages the service to which this descriptor belongs. The writeDescriptor() function writes the new value. The descriptorWritten() signal is emitted upon success. The cached value() of this object is updated accordingly.

See also

QLowEnergyService QLowEnergyCharacteristic

__init__()¶

Construct a new QLowEnergyDescriptor . A default-constructed instance of this class is always invalid.

__init__(other)

Parameters:: other – QLowEnergyDescriptor

Construct a new QLowEnergyDescriptor that is a copy of other.

The two copies continue to share the same underlying data which does not detach upon write.

isValid()¶

Return type:: bool

Returns true if the QLowEnergyDescriptor object is valid, otherwise returns false.

An invalid descriptor instance is not associated with any service (default-constructed) or the associated service is no longer valid due to a disconnect from the underlying Bluetooth Low Energy device, for example. Once the object is invalid it cannot become valid anymore.

Note

If a QLowEnergyDescriptor instance turns invalid due to a disconnect from the underlying device, the information encapsulated by the current instance remains as it was at the time of the disconnect. Therefore it can be retrieved after the disconnect event.

name()¶

Return type:: str

Returns the human-readable name of the descriptor.

The name is based on the descriptor’s type() . The complete list of descriptor types can be found under Bluetooth.org Descriptors .

The returned string is empty if the type() is unknown.

See also

type() descriptorToString()

__ne__(b)¶

Parameters:: b – QLowEnergyDescriptor
Return type:: bool

Returns true if a is not equal to b; otherwise false.

Two QLowEnergyDescriptor instances are considered to be equal if they refer to the same descriptor on the same remote Bluetooth Low Energy device or both instances have been default-constructed.

__eq__(b)¶

Parameters:: b – QLowEnergyDescriptor
Return type:: bool

Returns true if a is equal to b; otherwise false.

Two QLowEnergyDescriptor instances are considered to be equal if they refer to the same descriptor on the same remote Bluetooth Low Energy device or both instances have been default-constructed.

type()¶

Return type:: DescriptorType

Returns the type of the descriptor.

See also

name()

uuid()¶

Return type:: QBluetoothUuid

Returns the UUID of this descriptor if isValid() returns true; otherwise a null UUID.

value()¶

Return type:: QByteArray

Returns the cached value of the descriptor.

The cached descriptor value may be updated using writeDescriptor() or readDescriptor() .