what is CCCDs? how do I know the number I used?https://devzone.nordicsemi.com/f/nordic-q-a/2081/what-is-cccds-how-do-i-know-the-number-i-usedUsing sdk5.2, and ble_bondmngr_bonded_centrals_store() called on_disconnect, and then call err_code = sd_ble_gatts_sys_attr_get(m_conn_handle, m_central.sys_attr.sys_attr, &amp;sys_attr_size); SDK said The system attribute information did not fit intoen-USTelligent Community 13Thu, 03 Apr 2014 01:16:59 GMTRE: what is CCCDs? how do I know the number I used?https://devzone.nordicsemi.com/thread/8932?ContentTypeID=1Thu, 03 Apr 2014 01:16:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c6434e47-b187-4d5f-b8dd-c4e8416e5179julian<p>ok, found Client Characteristic Config Descriptor</p><div style="clear:both;"></div>