BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST event not generated

Question

I want to read characteristics (central needs read data from peripheral whenever he want ) but don’t want to use notification. 
 I am trying this with authorization but it can not generate BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST event. I just didn’t get what are the exactly settings required for that. I made changes in led service characteristics as follows. 
 What are the exactly changes I have to done here? OR Is there any example available where such solution used? 
 
 uint32_t ble_lbs_init(ble_lbs_t * p_lbs, const ble_lbs_init_t * p_lbs_init )
{
 uint32_t err_code;
 ble_uuid_t ble_uuid;
 ble_add_char_params_t add_char_params;
 ble_gatts_attr_md_t attr_md;

 // Initialize service structure.
 p_lbs->led_write_handler = p_lbs_init->led_write_handler;

 // Add service.
 ble_uuid128_t base_uuid = {LBS_UUID_BASE};
 err_code = sd_ble_uuid_vs_add(&base_uuid, &p_lbs->uuid_type);
 VERIFY_SUCCESS(err_code);

 ble_uuid.type = p_lbs->uuid_type;
 ble_uuid.uuid = LBS_UUID_SERVICE;

 err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &ble_uuid, &p_lbs->service_handle);
 VERIFY_SUCCESS(err_code);


 // Add LED characteristic.
 memset(&add_char_params, 0, sizeof(add_char_params));
 add_char_params.uuid = LBS_UUID_LED_CHAR;
 add_char_params.uuid_type = p_lbs->uuid_type;
 add_char_params.init_len = sizeof(uint8_t);
 add_char_params.max_len = sizeof(uint8_t);
 add_char_params.char_props.read = 1;
 add_char_params.char_props.write = 1;

 attr_md.rd_auth = 1; 

 add_char_params.read_access = SEC_OPEN;
 add_char_params.write_access = SEC_OPEN;

 err_code = characteristic_add(p_lbs->service_handle,
 &add_char_params,
 &p_lbs->led_char_handles);

}

void ble_lbs_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
{ 
 
 ble_lbs_t * p_lbs = (ble_lbs_t *)p_context;

 switch (p_ble_evt->header.evt_id)
 {
 case BLE_GATTS_EVT_WRITE:
 on_write(p_lbs, p_ble_evt);
 break;

 case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
 on_read(p_lbs, p_ble_evt);
 break;
 
 default:
 // No implementation needed.
 break;
 }
}

static void on_read(ble_lbs_t * p_lbs, ble_evt_t const * p_ble_evt)
{
 uint32_t err_code;
 uint8_t update_data = 0xAB;
 
 ble_gatts_rw_authorize_reply_params_t reply_params;

 memset(&reply_params, 0, sizeof(reply_params));
	
 reply_params.type = BLE_GATTS_AUTHORIZE_TYPE_READ;
 reply_params.params.read.p_data = &update_data;
 reply_params.params.read.len = sizeof(update_data);
 reply_params.params.read.offset = 0;
 reply_params.params.read.update = 0;
 reply_params.params.read.gatt_status = NRF_SUCCESS;
	
 sd_ble_gatts_rw_authorize_reply(p_ble_evt->evt.gap_evt.conn_handle, &reply_params);
}

Thanks in advance. 
 
 Regards, 
 Pooja

Susheel Nuguru · Accepted Answer

i am sorry, I do not know how I missed to see this. 
 The attr_md.rd_auth is not used anywhere in your code. It should set the attribute metadata for the charachteristic and you have not used the attr_md anywhere in your code. 
 For example inside your characteristic_add you should change something like this 
 attr_md.vloc = BLE_GATTS_VLOC_STACK;
 attr_md.rd_auth = 1;
 attr_md.wr_auth = 0;
 attr_md.vlen = 0;

 memset(&attr_char_value, 0, sizeof(attr_char_value));

 attr_char_value.p_uuid = &char_uuid;
 attr_char_value.p_attr_md = &attr_md;
 attr_char_value.init_len = APP_CFG_CHAR_LEN;
 attr_char_value.init_offs = 0;
 attr_char_value.max_len = APP_CFG_CHAR_LEN;
 attr_char_value.p_value = m_char_value;

 err_code = sd_ble_gatts_characteristic_add(m_service_handle,
 &char_md,
 &attr_char_value,
 &m_char_handles);

BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST event not generated

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