https://devzone.nordicsemi.com/f/nordic-q-a/32706/value-cccd-field-of-custom-characteristic-cannot-be-readHello, I use the nrf51 with SDK 12.3.0. I followed the tutorial for custom services and added characteristics as described here: https://devzone.nordicsemi.com/tutorials/b/bluetooth-low-energy/posts/ble-characteristics-a-beginners-tutorial Now,en-USTelligent Community 13Sun, 25 Mar 2018 15:26:13 GMThttps://devzone.nordicsemi.com/thread/125874?ContentTypeID=1Sun, 25 Mar 2018 15:26:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5958c378-4b54-4226-9c41-4e12c400d479the_summer<p><span style="background-color:#ffffff;color:#000000;float:none;font-family:Arial, Helvetica, sans-serif;font-size:12px;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;">Ok. I was missing the peer_manager. I was trying to have a minimal example, but it appears without it there the CCCDs do not behave standard conformant.</span></p><div style="clear:both;"></div>