Florian, I have tested 128-bit UUIDs on iOS 6 Beta 4 and did not encounter such problems. In my case, a CSR 1000 chip was used as peripheral, and a new iPad as well as an iPhone 4S were used as centrals. I am using both 128-bit and 16-bit UUIDs for primary services and characteristics. I am also using only short characteristics with less than or equal 20 bytes of payload. What you could do is to use the TI packet sniffer software to get an air trace. CoreBluetooth does not expose valuable information in the error-objects. Therefore, the air trace could provide you with further information on what could go wrong in your case. Could it be that your GATT-database is malformed? And do BLE tools from the AppStore also encounter errors when writing to your characteristics? Etan On 05.09.2012, at 13:51, Florian Schulz <florianschulz@me.com> wrote:

Hi,

We are developing accessory hardware implementing the peripheral role - our app acts as the central. We are using the TI CC2540 chip for BLE on our hardware.

Recently we discovered a major issue regarding iOS 6. On iOS 6 beta 4 writing values using writeValue:forCharacteristic:type: always fails, when we don't use standard profile UUIDs. We are using 128-Bit UUIDs for either our custom services and characteristics. We also tried using a 128-Bit UUID just for the service, and 16-Bit UUIDs for the characteristics with no success. The didWriteValueForCharacteristic: callback is fired immediately after starting the write request. An error object is passed to that callback, saying that the operation couldn't be completed: peripheral:didWriteValueForCharacteristic:error: Code: 0 Domain: CBErrorDomain Description: Unknown error.

The write has no effect. On iOS 5.1.1 writing values using 128-Bit UUIDs works fine. We don't know exactly if the error only exists since iOS 6 beta 4, or if it was present on previous iOS 6 builds as well.

This is a critical issue for us, since we are about to start mass production of our hardware.

Is this behavior caused by a change in iOS 6 that will find its way to the final release, or is this a beta issue?

Best Regards, Florian _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/etan.kissling%40oberon...

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