BLE_DB_DISCOVERY_ERROR When Modifying Battery Service

Question

I'm trying to adapt the BLE_BAS_C library to perform discovery and read/write operations for a custom service. However, when I change the UUID that I register with ble_db_discovery_evt_register(), I see the services start to be discovered with sd_ble_gattc_primary_services_discover(), but when the db_discovery_evt_handler() in ble_bas_c is entered instead of the expected BLE_DB_DISCOVERY_COMPLETE event type I see BLE_DB_DISCOVERY_ERROR. 
 I'm wondering if this has to do with the fact that it's a vendor specific service rather than a standard BLE one. I've attached the changes I've made- is there something I'm missing, or do I need to do something else with regards to the UUID base. 
 CENTRAL

static void db_discovery_evt_handler(ble_db_discovery_evt_t * p_evt)
{
 printf("[BAS_C] Discovery event handler 
");
 
 // Check if the Battery Service was discovered.
 if (p_evt->evt_type == BLE_DB_DISCOVERY_COMPLETE){
 printf("[BAS_C] UUID 0x%x 
", p_evt->params.discovered_db.srv_uuid.uuid);
 
 if (p_evt->params.discovered_db.srv_uuid.uuid == DEVICE_STATUS_SERVICE_UUID){
 
 if (p_evt->params.discovered_db.srv_uuid.type == BLE_UUID_TYPE_VENDOR_BEGIN){

 printf("[BAS_C] Battery Service discovered at peer.
");

 ble_bas_c_evt_t evt;

 evt.evt_type = BLE_BAS_C_EVT_DISCOVERY_COMPLETE;

 mp_ble_bas_c->evt_handler(mp_ble_bas_c, &evt);
 }
 }
 }
 else
 {
 printf("[BAS_C] Battery Service discovery failure at peer. 
");
 }
}

uint32_t ble_bas_c_init(ble_bas_c_t * p_ble_bas_c, ble_bas_c_init_t * p_ble_bas_c_init)
{
 if ((p_ble_bas_c == NULL) || (p_ble_bas_c_init == NULL))
 {
 return NRF_ERROR_NULL;
 }

 ble_uuid_t bas_uuid;

 bas_uuid.type = BLE_UUID_TYPE_VENDOR_BEGIN;
 bas_uuid.uuid = DEVICE_STATUS_SERVICE_UUID;

 mp_ble_bas_c = p_ble_bas_c;

 mp_ble_bas_c->conn_handle = BLE_CONN_HANDLE_INVALID;
 mp_ble_bas_c->bl_cccd_handle = BLE_GATT_HANDLE_INVALID;
 mp_ble_bas_c->bl_handle = BLE_GATT_HANDLE_INVALID;
 mp_ble_bas_c->evt_handler = p_ble_bas_c_init->evt_handler;

 return ble_db_discovery_evt_register(&bas_uuid, db_discovery_evt_handler);
}
 
 
 
 PERIPHERAL

/**@brief Function for initializing services that will be used by the application.
 *
 * @details Initialize the multilink custom service.
 */
static void services_init(void)
{
 uint32_t err_code;
 ble_uuid_t uuid;
 ble_gatts_char_md_t char_md;
 ble_gatts_attr_t attr;
 ble_gatts_attr_md_t attr_md;
 ble_gatts_attr_md_t cccd_md;
 ble_gatts_attr_md_t char_ud_md;
 uint16_t svc_test;

 /* Add device status service */
 ble_uuid128_t base_uuid = DEVICE_STATUS_BASE_UUID;

 err_code = sd_ble_uuid_vs_add(&base_uuid, &m_base_uuid_type);
 APP_ERROR_CHECK(err_code);

 uuid.type = m_base_uuid_type;
 uuid.uuid = DEVICE_STATUS_SERVICE_UUID;

 err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &uuid, &svc_test);
 APP_ERROR_CHECK(err_code);

 /* Add device status -> Side characteristic */
 static uint8_t char_side_data;
 static uint8_t char_side_ud[] = "Side Characteristic";
 uuid.uuid = DEVICE_STATUS_SIDE_CHAR_UUID;

 memset(&attr, 0, sizeof(ble_gatts_attr_t));
 attr.p_uuid = &uuid;
 attr.p_attr_md = &attr_md;
 attr.max_len = 1;
 attr.p_value = &char_side_data;
 attr.init_len = sizeof(char_side_data);

 memset(&attr_md, 0, sizeof(ble_gatts_attr_md_t));
 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
 BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&attr_md.write_perm);
 attr_md.vloc = BLE_GATTS_VLOC_STACK;
 attr_md.vlen = 0;

 memset(&cccd_md, 0, sizeof(ble_gatts_attr_md_t));
 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
 BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&cccd_md.write_perm);
 cccd_md.vloc = BLE_GATTS_VLOC_STACK;

 memset(&char_md, 0, sizeof(ble_gatts_char_md_t));
 char_md.p_cccd_md = &cccd_md;
 char_md.char_props.notify = 1;
 char_md.char_props.indicate = 1;
 char_md.char_props.read = 1;
 char_md.char_props.write = 1;
 char_md.char_ext_props.wr_aux = 1;
 char_md.p_user_desc_md = &char_ud_md;
 char_md.p_char_user_desc = char_side_ud;
 char_md.char_user_desc_size = (uint8_t)strlen((char *)char_side_ud);
 char_md.char_user_desc_max_size = (uint8_t)strlen((char *)char_side_ud);

 memset(&char_ud_md, 0, sizeof(ble_gatts_attr_md_t));
 char_ud_md.vloc = BLE_GATTS_VLOC_STACK;
 char_ud_md.vlen = 1;
 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&char_ud_md.read_perm);
 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&char_ud_md.write_perm);

 err_code = sd_ble_gatts_characteristic_add(BLE_GATT_HANDLE_INVALID,
 &char_md,
 &attr,
 &m_side_handle);
 APP_ERROR_CHECK(err_code);
 
 /* Add device status -> MODE characteristic */
 static uint8_t char_mode_data;
 static uint8_t char_mode_ud[] = "Mode Characteristic"; 
 uuid.uuid = DEVICE_STATUS_MODE_CHAR_UUID;

 attr.p_uuid = &uuid;
 attr.p_value = &char_mode_data;
 attr.init_len = sizeof(char_mode_data);

 char_md.p_char_user_desc = char_mode_ud;
 char_md.char_user_desc_size = (uint8_t)strlen((char *)char_mode_ud);
 char_md.char_user_desc_max_size = (uint8_t)strlen((char *)char_mode_ud);

 err_code = sd_ble_gatts_characteristic_add(BLE_GATT_HANDLE_INVALID,
 &char_md,
 &attr,
 &m_mode_handle);
 APP_ERROR_CHECK(err_code);
 
 /* Add device status -> STATUS characteristic */
 static uint8_t char_status_data;
 static uint8_t char_status_ud[] = "Status Characteristic"; 
 uuid.uuid = DEVICE_STATUS_STATUS_CHAR_UUID;

 attr.p_uuid = &uuid;
 attr.p_value = &char_status_data;
 attr.init_len = sizeof(char_status_data);

 char_md.p_char_user_desc = char_status_ud;
 char_md.char_user_desc_size = (uint8_t)strlen((char *)char_status_ud);
 char_md.char_user_desc_max_size = (uint8_t)strlen((char *)char_status_ud);

 err_code = sd_ble_gatts_characteristic_add(BLE_GATT_HANDLE_INVALID,
 &char_md,
 &attr,
 &m_stream_status_handle);
 APP_ERROR_CHECK(err_code);
}