How to repeat reading the value from the BLE device only when the value updated (python on MacOS)?

Question

As title, now I can get values from the BLE device, as the following codes shown:

class RobotDelegate(object):
...

def peripheral_didDiscoverCharacteristicsForService_error_(self, peripheral, service, error):
for characteristic in self.service.characteristics():
   if characteristic.UUID() == blebee_characteristic:
        self.characteristic = characteristic
        print ("self.characteristic.value = ", self.characteristic.value())
...

delegate = RobotDelegate()
manager = CBCentralManager.alloc()
manager.initWithDelegate_queue_options_(delegate, None, None)

AppHelper.runConsoleEventLoop()

And I can read the value from my BLE device only one time... Actually, the BLE device can continuously update the value when someone touch, so I like to know how should I do to achieve this? Thanks.

Answer 1

I would recommend to use the Observer Pattern. An Example can be found here . In your case a BLE device would be a 'Subject' and notifies each time, when the value changes.