how to add password security for my BLUENRG2A1 BLE shiled

[koushikkabade]

I am working with nucleo l496zg development board and I have successfully interfaced x nucleo bluenrg shield and able to receive and send data. I want to implement passcode security to my BLE dev while making a connection and send the data in encrypted mode

I followed BlueNRG-2 BLE stack v2.x programming guidelines and  used void aci_gap_pass_key_req_event() and ret=aci_gap_set_io_capability() functions to enable security but I am not able to implement it proprely i guess.

Can anyone take a look at my BLE Init and help me with a solution

	hci_init(APP_UserEvtRx, NULL);

	hci_reset();

	HAL_Delay(100);

	ret = aci_hal_write_config_data(CONFIG_DATA_PUBADDR_OFFSET, CONFIG_DATA_PUBADDR_LEN, bdaddr);
	ret = aci_gatt_init();
	if(ret != BLE_STATUS_SUCCESS)
		{
			printf("aci_gatt_init : FAILED!! \n\r");
		}

	ret = aci_gap_init(GAP_PERIPHERAL_ROLE, 0, 0x07, &service_handle, &dev_name_handle, &appearance_char_handle);
//	ret = aci_gap_init(GAP_PERIPHERAL_ROLE, 0x02, sizeof (name), &service_handle, &dev_name_handle, &appearance_char_handle);
		if(ret != BLE_STATUS_SUCCESS)
		{
			printf("aci_gap_init : FAILED!! \n\r");
		}



	ret = aci_gatt_update_char_value(service_handle, dev_name_handle, 0, strlen(name), (uint8_t *)name);
		if(ret != BLE_STATUS_SUCCESS)
			{
				printf("aci_gatt_update_char_value : FAILED!! \n\r");
			}

//	ret = aci_gap_clear_security_db();
//		if(ret != BLE_STATUS_SUCCESS)
//			{
//					printf("aci_gatt_update_char_value : FAILED!! \n\r");
//			}

		/*Update characteristics value*/
	ret= aci_gap_set_io_capability(IO_CAP_DISPLAY_ONLY);
		if (ret != BLE_STATUS_SUCCESS)
			{printf("Failure.\n");}

			/*Update characteristics value*/
	ret=aci_gap_set_authentication_requirement(BONDING,/*bonding is	enabled */
					MITM_PROTECTION_REQUIRED,
					SC_IS_SUPPORTED,/*Secure connection	supported	but optional */
					KEYPRESS_IS_NOT_SUPPORTED,
					7, /* Min encryption key size */
					16, /* Max encryption	key size */
					USE_FIXED_PIN_FOR_PAIRING, /* fixed pin is not used*/
					123456, /* fixed pin */
					STATIC_RANDOM_ADDR /* Public Identity address type */);
		if (ret != BLE_STATUS_SUCCESS)
				{printf("Failure.\n");}


	ret = add_service();