How to send AT commands using Keil

Hi,

I am using HC-05 bluetooth module and STM32F407. I have to enter AT Command Mode and send some AT Commands. Normally, i do it pressing button on the module. But i have to enter AT Command Mode using only software. I can enter AT Command Mode, but i can't send any AT Commands to module. I tried to change the name of the module but it didn't work.

Here is my try. Where is my mistake?

/* USER CODE BEGIN PV */
uint8_t data[50];
/* USER CODE END PV */
static void MX_USART3_UART_Init(void)
{
sprintf(data,"AT+NAME=charles \n\r");
HAL_UART_Transmit(&huart3, (uint8_t *)data, strlen(data), 2000);
}