https://devzone.nordicsemi.com/f/nordic-q-a/2328/any-possible-to-write-value-to-cccd-from-itselfHi, I&#39;m a ble developer using nrf51822. It is a wierd question, Is this any possible to write value to one characteristic&#39;s CCCD value from itself(device)? This is my situation: I&#39;m implement an higher layer protocol between mobile and ble deviceen-USTelligent Community 13Fri, 25 Apr 2014 01:21:34 GMThttps://devzone.nordicsemi.com/thread/9602?ContentTypeID=1Fri, 25 Apr 2014 01:21:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:16b470fb-3e85-431e-a2fb-cae77cf3b410Scarlet<p>Thanks your information :D</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/9601?ContentTypeID=1Thu, 24 Apr 2014 07:16:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a2a8e617-d4a3-4ba9-badb-f651f6b83defP&#229;l H&#229;land<p>Hi Scarlet,</p> <p>If you&#39;r mobile is an iOS system, then you are required to enable the CCCD&#39;s before the BLE device starts notifying them, because if you don&#39;t enable them the iOS device does not know if it should forward the notifications to the application. <a href="https://developer.apple.com/library/ios/documentation/CoreBluetooth/Reference/CBPeripheral_Class/translated_content/CBPeripheral.html#//apple_ref/occ/instm/CBPeripheral/setNotifyValue:forCharacteristic:">developer.apple.com/.../CBPeripheral.html</a></p> <p>The same thing looks like applies for Android <a href="http://developer.android.com/guide/topics/connectivity/bluetooth-le.html#notification">developer.android.com/.../bluetooth-le.html</a></p> <p>another solution is to use the GATT Client to send write commands/requests instead of sending Notifications if you don&#39;t want to use the CCCD.</p> <p>By using the bond manger and bonding to the device you want to connect to, you don&#39;t have to bother that much by setting the CCCD.</p> <p><a href="https://devzone.nordicsemi.com/documentation/nrf51/5.2.0/html/a00103.html">devzone.nordicsemi.com/.../a00103.html</a></p><div style="clear:both;"></div>