https://devzone.nordicsemi.com/f/nordic-q-a/24573/writing-to-multiple-cccd-handlesI am attempting to write to multiple CCCD handles in a service as a central with no luck. I need to write to one CCCD handle to enable notifications and another handle (BLE_UUID_UPDATE_CHARACTERISTIC) to determine the notification frequency, but I amen-USTelligent Community 13Thu, 24 Aug 2017 06:46:21 GMThttps://devzone.nordicsemi.com/thread/96750?ContentTypeID=1Thu, 24 Aug 2017 06:46:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:afe21668-10a6-4d41-8b7a-3b1d595df9a5run_ar<p>Excellent I converted this to an aswer. Note that you should check the error code returned by sd_ble_gattc_write (cccd_configure_value). This would have given you an NRF_ERROR_BUSY when trying to perform a new write request with another one pending.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/96749?ContentTypeID=1Wed, 23 Aug 2017 17:07:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4d78d823-6d94-4705-a5ba-91046ded731dpbirkner<p>I was a bit confused about writing to a characteristic vs a characteristic descriptor, but I did have the correct handle. I solved my problem by creating a write-buffer similar to the one used in the ble_ancs_c service.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/96748?ContentTypeID=1Wed, 23 Aug 2017 12:57:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fd15b5f7-e24b-40b7-b0ca-dd318f83d371run_ar<p>Can you clearify a few things: What is 0xFF60? is this the BLE_UUID_UPDATE_CHARACTERISTIC?<br /> 0xFDA0 looks like a characteristic descriptor, not a characteristic. Can you check that you are trying to write to the correct handle?</p><div style="clear:both;"></div>