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    <p>I've been running into this too and it appears to be a bug in Core Bluetooth's XPC communication:</p> <pre><code>2013-03-22 14:49:24.652 Buggy[985:907] Connecting to peripheral &lt;CBConcretePeripheral: 0x1dd4e150 UUID = (null), Name = "iPhone 5 #003014", IsConnected = NO&gt; 2013-03-22 14:49:24.659 Buggy[985:907] CoreBluetooth[WARNING] Unknown error: 311 2013-03-22 14:49:24.661 Buggy[985:907] Failed to connect to peripheral &lt;CBConcretePeripheral: 0x1dd4e150 UUID = (null), Name = "iPhone 5 #003014", IsConnected = NO&gt; 2013-03-22 14:49:24.689 Buggy[985:907] Discovered peripheral &lt;CBConcretePeripheral: 0x1dd644d0 UUID = (null), Name = "iPhone 5 #003014", IsConnected = NO&gt; with advertisement data { kCBAdvDataLocalName = "iPhone 5 #003014"; kCBAdvDataServiceUUIDs = ( "Unknown (&lt;b2e74c08 96094371 a8f0978c 655700ea&gt;)" ); }, RSSI: -50 2013-03-22 14:49:24.692 Buggy[985:907] Connecting to peripheral &lt;CBConcretePeripheral: 0x1dd644d0 UUID = (null), Name = "iPhone 5 #003014", IsConnected = NO&gt; 2013-03-22 14:49:45.035 Buggy[985:110b] CoreBluetooth[ERROR] XPC connection interrupted, resetting 2013-03-22 14:49:45.050 Buggy[985:907] Central manager updated state to: 1 2013-03-22 14:49:45.116 Buggy[985:907] Central manager updated state to: 4 2013-03-22 14:49:47.271 Buggy[985:907] Central manager updated state to: 5 </code></pre> <p>After this point things started working again, at least until the error 311 loop struck again a few minutes later.</p> <p>Here's a workaround that's been reliable for me:</p> <pre><code>// In centralManager:didFailToConnectPeripheral:error:, ARC enabled if (error.code == 0) { self.centralManager.delegate = nil; self.centralManager = nil; // Remove all references to any peripherals you've been interacting with [self.peripherals removeAllObjects]; /* Some delay (more than the next iteration of the runloop, less than 2 seconds) is required in order to: * • Allow ARC to drain the autorelease pool, ensuring destruction of the centralManager * • Allow Core Bluetooth to turn off the radio. * * This means that this workaround might not work if: * • Your code has another active central manager somewhere * • Another app is using BLE (in theory; I haven't tested this) */ double delayInSeconds = 2.0; dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC)); dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ self.centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()]; [self startScanning]; }); } </code></pre>
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    1. POCoreBluetooth[WARNING] Unknown error: 311 Occurs when repeatedly connect and disconnect using CoreBluetooth Framework in iOS
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    1. COI am getting this error after connecting successfully to the peripheral "CoreBluetooth[WARNING] Unknown error: 14" which causes it to disconnect. Any ideas?
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    2. COLooks like you already posted [this question](http://stackoverflow.com/questions/15581684/corebluetoothwarning-unknown-error-14-on-iphone-5) on Stack Overflow. I don't know offhand, but [you're not alone](http://e2e.ti.com/support/low_power_rf/f/538/p/220588/777454.aspx).
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