sd_ble_gatts_hvx() returns 13313 if notifications are not enabled

[Andreas]

Hello,

I can see, that sd_ble_gatts_hvx() returns 13313, if the notification is not enabled for that characteristic from the connected central. --> S120 Softdevice runs as peripheral. Is that right? Do I have to handle that error in any case?

Regards, BTprogrammer

[Hung Bui]

Hi BT,

It's the BLE_ERROR_GATTS_SYS_ATTR_MISSING and should not be ignored. You should initialize the system attribute (the CCCD value) by calling sd_ble_gatts_sys_attr_set() (either with NULL or with the value was set before if it's a bonded device).

If the case was that the central hasn't enabled the CCCD, you should receive NRF_ERROR_INVALID_STATE instead.

Please refer to the documentation of sd_ble_gatts_hvx()