I am trying to get the notification from a bluetooth device upon the characteristic value change. For this I need to enable notification for Client Characteristic Configuration(CCC) descriptor. I have used setNotifyValue(enabled: Bool, forCharacteristic characteristic: CBCharacteristic) for the characteristic but not getting the update for value changes.
I tried to enable the indication for CCC using writeValue(data: NSData, forDescriptor descriptor: CBDescriptor) but my app crashes for this API and shows the error as
Cannot write Client Characteristic Configuration descriptors using this method!
Any help!!
1 Answers
Answers 1
Provide more codes might help to imporove accuracy of an answer; however, let's be assuming you have already been able to discover all characteristic values. Usually you just need to iterate all characteristics and set/write value according to each Client Characteristic Configuration(CCC) descriptor in CBPeripheralDelegate implementation.
An example is attached below:
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error { if (error) { NSLog(@"Error discovering characteristics: %@", error); return; } for (CBCharacteristic *characteristic in service.characteristics) { if ([characteristic.UUID isEqual:[CBManager accelDataUUID]]) { [peripheral setNotifyValue:YES forCharacteristic:characteristic]; } else if ([characteristic.UUID isEqual:[CBManager accelConfigUUID]]) { [peripheral writeValue:[CBManager switchData:YES] forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse]; } //... if you have more to iterate } } 
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