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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