Suddenly I'm seeing spontaneous disconnects in my iOS 7 app from my nRF51822 peripheral

[Don]

Suddenly my app, running on iOS 7, is reporting lots of spontaneous disconnects by the peripheral device, an nRF51822, indicating a timeout:

didDisconnectPeripheral: Peripheral with UUID = 2F82C038-59AF-FA33-1963-644155D9CD09 disconnected, error = Error Domain=CBErrorDomain Code=6 "The connection has timed out unexpectedly." UserInfo=0x176d88c0 {NSLocalizedDescription=The connection has timed out unexpectedly.}

Also seeing lots of cases of service discovery reporting unknown error: didDiscoverServices: Error code was Error Domain=CBErrorDomain Code=0 "Unknown error." UserInfo=0x16d48850 {NSLocalizedDescription=Unknown error.},

This is a recent phenomenon, and I'm looking for some way of finding out what caused Core Bluetooth to report these. In the case of the timeout, what timed out? I assume this is coming from the interaction going on between CB and the peripheral, and CB possibly didn't get a response it was expecting? In the case of the service discovery error, it would help to know more about what CB is reporting with the unknown error code. Is there any way to get some additional feedback from CB? This is more a question for Apple and has been posted on the CB forum there, but maybe someone here has some insights.

[John]

Hi Ole,

I'll let Don address creating the support case and providing the sniffer trace.

I can answer your question regarding Master Control Panel. I use the Master Control Panel extensively as I develop our embedded FW. The problem does not appear with the Master Control Panel. It appears to be some sort of interaction between the iOS Core Bluetooth and the Soft Device Stack. One observation I have made is that the Master Control Panel and Core Blue tooth have different methods to read out the services and characteristics immediately after the connection request/response.