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I'm developing a BLE app in iOS6. I got CoreBluetooth[WARNING] Unknown error: 2 when I call readValueForCharacteristic on a characteristic after it's set to notifying state.
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error`
The delegate callback gets called with an unknown error from NSLog: `Error updating value for characteristic Unknown (&fef2&) error: Error Domain=CBErrorDomain Code=0 "Unknown error." UserInfo=0x1dd3b7e0 {NSLocalizedDescription=Unknown error.}
Please give some advice.
18.8k75188
From what I can tell, you cannot read the value of a characteristic that is set to notify.
You need to "subscribe" to notifications for that characteristic:
[peripheral setNotifyValue:YES forCharacteristic:characteristic];
The value can then be read in your delegate method:
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
The BLE docs for iOS are quite poor in this regard.
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