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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtCore import QObject, Property, Signal
from PySide6.QtBluetooth import QLowEnergyCharacteristic, QBluetoothUuid
class CharacteristicInfo(QObject):
characteristic_changed = Signal()
def __init__(self, characteristic=None) -> None:
super().__init__()
self._characteristic = characteristic
@Property(str, notify=characteristic_changed)
def characteristic_name(self):
if not self.characteristic:
raise Exception("characteristic unset")
name = self.characteristic.name()
if name:
return name
for descriptor in self.characteristic.descriptors():
if descriptor.type() == QBluetoothUuid.DescriptorType.CharacteristicUserDescription:
name = descriptor.value()
break
if not name:
name = "Unknown"
return name
@Property(str, notify=characteristic_changed)
def characteristic_uuid(self):
uuid = self.characteristic.uuid()
result16, success16 = uuid.toUInt16()
if success16:
return f"0x{result16:x}"
result32, sucess32 = uuid.toUInt32()
if sucess32:
return f"0x{result32:x}"
return uuid.toString().replace('{', '').replace('}', '')
@Property(str, notify=characteristic_changed)
def characteristic_value(self):
# Show raw string first and hex value below
a = self.characteristic.value()
if not a:
return "<none>"
result = f"{str(a)}\n{str(a.toHex())}"
return result
@Property(str, notify=characteristic_changed)
def characteristic_permission(self):
properties = "( "
permission = self.characteristic.properties()
if (permission & QLowEnergyCharacteristic.Read):
properties += " Read"
if (permission & QLowEnergyCharacteristic.Write):
properties += " Write"
if (permission & QLowEnergyCharacteristic.Notify):
properties += " Notify"
if (permission & QLowEnergyCharacteristic.Indicate):
properties += " Indicate"
if (permission & QLowEnergyCharacteristic.ExtendedProperty):
properties += " ExtendedProperty"
if (permission & QLowEnergyCharacteristic.Broadcasting):
properties += " Broadcast"
if (permission & QLowEnergyCharacteristic.WriteNoResponse):
properties += " WriteNoResp"
if (permission & QLowEnergyCharacteristic.WriteSigned):
properties += " WriteSigned"
properties += " )"
return properties
@property
def characteristic(self):
return self._characteristic
@characteristic.setter
def characteristic(self, characteristic):
self._characteristic = characteristic
self.characteristic_changed.emit()
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