 <p>The <a href="https://developer.apple.com/library/ios/documentation/CoreBluetooth/Reference/CBCharacteristic_Class/#//apple_ref/c/tdef/CBCharacteristicProperties" rel="nofollow">documentation</a> is pretty clear. You cannot use this property on characteristics you publish. The purpose of this value is to enable you to interpret the properties of characteristics that are discovered from other peripherals. </p> <p>If you want to advise centralised that your value has changed then <code>notify</code> is the appropriate method. </p>