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peripheral:didUpdateValueForCharacteristic:error: not called for notification
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peripheral:didUpdateValueForCharacteristic:error: not called for notification


  • Subject: peripheral:didUpdateValueForCharacteristic:error: not called for notification
  • From: Joe Rossano <email@hidden>
  • Date: Thu, 24 Jul 2014 15:37:28 +0000
  • Thread-topic: peripheral:didUpdateValueForCharacteristic:error: not called for notification

I am trying to write a BTLE monitoring app that receives notifications.

I have built both the central app and a mock peripheral app using Core Bluetooth (on iOS 7.1). My central can connect fine to the peripheral, which advertises a service that has 2 CBCharacteristicPropertyNotify characteristics. But here is what happens once the central discovers the characteristics (removing non-essential code for clarity).


PD = CBPeripheralDelegate in central
PMD = CBPeripheralManagerDelegate in peripheral


PD callback invoked
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
for (CBCharacteristic *characteristic in service.characteristics)
{
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
}
}


PMD callback invoked twice for the 2 characteristics
- (void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didSubscribeToCharacteristic:(CBCharacteristic *)characteristic
{
if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:FILTER_GENUINE_CHARACTERISTIC_UUID]])
{
BOOL genuineSent = [self.peripheralManager updateValue:genuineValue forCharacteristic:self.filterGenuineCharacteristic onSubscribedCentrals:nil];
}
else if ([characteristic.UUID isEqual:[CBUUID UUIDWithString:FILTER_LOADING_CHARACTERISTIC_UUID]])
{
BOOL loadingSent = [self.peripheralManager updateValue:loadingValue forCharacteristic:self.filterLoadingCharacteristic onSubscribedCentrals:nil];
}
}


* The first time this method is invoked the return from
updateValue:forCharacteristic:onSubscribedCentrals: in YES.The second time
the return is always NO.


PD callback invoked twice for the 2 characteristics
- (void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
* characteristic.isNotifying is always YES.


But that¹s it, no other callback methods are invoked!


PMD callback peripheralManagerIsReadyToUpdateSubscribers: is never called for the updateValue:forCharacteristic:onSubscribedCentrals: call that returned NO
- (void)peripheralManagerIsReadyToUpdateSubscribers:(CBPeripheralManager *)peripheral


PD callback peripheral:didUpdateValueForCharacteristic:error: is never called for the updateValue:forCharacteristic:onSubscribedCentrals: call that returned YES
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error



I have been testing these apps on an iPad Air and iPhone 5s, both running
iOS 7.1.

Any idea why the notification is never invoked?


Thanks,
Joe
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