How to change advertisment data on BLE beacon

[AlexES]

Hello. 
I got my hands on a wba55cg nucleo board and i'm currently studying about ble.
I want to create a BLE Beacon that changes its adv_data whenever a user presses one of the button. From messing around using the p2p_server and beacon st examples, i implemented the following steps:

1) Create a task that updates the adv_data and register it to the ble back ground sequencer. Added the following line in app_conf.h

 

CFG_TASK_ADV_DATA_UPDATE,

 

 2)Set my device as eddystone uuid. Again added the following line in app_conf.h

 

#define CFG_BEACON_TYPE (CFG_EDDYSTONE_UID_BEACON_TYPE )

 

3)On app_ble_init  in app_ble.c registered a function to handle my task 

 

UTIL_SEQ_RegTask(1U << CFG_TASK_ADV_DATA_UPDATE, UTIL_SEQ_RFU,Ble_adv_data_update);

 

4) Implemented the adv_data_update_function inside app_ble.c

 

static void Ble_adv_data_update(void)
{
 const char str1[] = "ESS";
 const char str2[] = "TODAY IS 11";

 uint8_t adv_data[31];
 uint8_t len = 0;

 /* --- FLAGS --- */
 adv_data[len++] = 2; // length
 adv_data[len++] = AD_TYPE_FLAGS;
 adv_data[len++] =
 FLAG_BIT_LE_GENERAL_DISCOVERABLE_MODE |
 FLAG_BIT_BR_EDR_NOT_SUPPORTED;

 /* --- MANUFACTURER SPECIFIC DATA --- */
 adv_data[len++] = 1 + 2 + sizeof(str1) - 1 + sizeof(str2) - 1;
 adv_data[len++] = AD_TYPE_MANUFACTURER_SPECIFIC_DATA;

 /* Company ID (example, use your own if you have one) */
 adv_data[len++] = 0xE5;
 adv_data[len++] = 0x69;

 /* Payload: "ESS" */
 memcpy(&adv_data[len], str1, sizeof(str1) - 1);
 len += sizeof(str1) - 1;

 /* Payload: "TODAY IS 11" */
 memcpy(&adv_data[len], str2, sizeof(str2) - 1);
 len += sizeof(str2) - 1;

 /* --- Update advertising data --- */
 aci_gap_update_adv_data(len, adv_data);
}

 

5) Tired to reister a gpio pin, that the user button is connected to as an exti source on app_entry and push the adv_update task on its callback (can't access .ioc file due to version incompatibility)

 

static void Custom_gpio_init(void)
{

	GPIO_InitTypeDef GPIO_InitStruct = {0};

	GPIO_InitStruct.Pin = GPIO_PIN_13;
	GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING; // button press
	GPIO_InitStruct.Pull = GPIO_PULLUP; // external pull-up/down?
	HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
}

//Called above fyunction inside MX_APPE_INIT

void EXTI15_10_IRQHandler(void)
{
 HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_13);
}


void HAL_GPIO_EXTI_Callback( uint16_t GPIO_Pin )
{
 switch (GPIO_Pin)
 {
 case GPIO_PIN_13:
 	UTIL_SEQ_SetTask(1U << CFG_TASK_ADV_DATA_UPDATE, CFG_SEQ_PRIO_0);
 break;

 default:
 break;

 }
}

 

Any advice would be more than welcome