Hi, I've been suffering with detection of writing to cccd to enable notifications. The S132 (nRF5_SDK_13.0.0_04a0bfd + s132_nrf52_4.0.2_softdevice) never fires BLE_GATTS_EVT_WRITE event to indicate that the peer wrote to cccd.
From whatever reason the softdevice does not fire event when writing to cccd using BLE_GATT_OP_WRITE_CMD. Workaround was writing to cccd using BLE_GATT_OP_WRITE_REQ, the event was fired (but the _REQ case is not what I want as additional round trip occurs)
here the code snippet on service and char adding with permissions
err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &ble_uuid, &m_service_handle);
memset(&char_md, 0, sizeof(char_md));
char_md.char_props.notify = 1;
char_md.char_props.write_wo_resp = 1;
memset(&attr_md, 0, sizeof(attr_md));
BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&attr_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);
attr_md.vloc = BLE_GATTS_VLOC_STACK;
attr_md.rd_auth = 0;
attr_md.wr_auth = 1;
attr_md.vlen = 1;
memset(&attr_char_value, 0, sizeof(attr_char_value));
attr_char_value.p_uuid = &ble_uuid;
attr_char_value.p_attr_md = &attr_md;
attr_char_value.max_len = BLE_GATT_ATT_MTU_DEFAULT-3;
err_code = sd_ble_gatts_characteristic_add(m_service_handle,
&char_md,
&attr_char_value,
&m_message_handles);
Interesting is that my code was ported from S132 (SDK V11.0.0-S132-V2-0-1) where it works.As I do not see any obvious issue, can someone help? Any ideas on what might be wrong, what are the trigger conditions for BLE_GATTS_EVT_WRITE (cccd), any suggestions what I might overlook while porting, anyone having the same issue? Many thanks