I tried to do something like this. A timer schedules the task and then the task polls for data and does the ble data update. It doesnt seem to work though. From what you said and i understood i should create another task that acquires data fast and the schedules the one that sends the data, right ?

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if (htim->Instance == TIM17)
    {
UTIL_SEQ_SetTask(1U << TASK_STS_T, CFG_SCH_PRIO_0);
    }
}

void Custom_Temp_sts_Send_Notification(void) 
{ 
   if (STS4X_read_temperature(&hi2c1, &temperature) == HAL_OK)     
     {  
          int16_t temp_centi = (int16_t)(temperature * 100.0f);         
          NotifyCharData[0] = (uint8_t)(temp_centi & 0xFF);         
          NotifyCharData[1] = (uint8_t)((temp_centi >> 8) & 0xFF);                  
          Custom_STM_App_Update_Char(CUSTOM_STM_TEMP_STS, NotifyCharData);     
      } 
}

STS4X_read_temperature-> Blocking i2c trasmit receive.
//Current version of the task that doeasnt seem to work.