How could I change the baud rate of my STM32 UART by receiving input from another microcontroller? - stm32

Question

I'm currently trying to change the baudrate at runtime for my STM32 based on whatever input my ESP32 sends it over UART. I'm. not really sure how to go about it or if its even possible to do so.
Basically I'm sending a uint32 over UART to the STM32 and hoping it is receiving it as the number I'm sending then aborting and deinitializing the UART, reinitializing it with the new baud rate and then initializing the UART again.
However, this does not seem to be having any effect. I can't tell if what I'm sending it just not making it to the STM32 as the value I intended or if it's receiving the value and just not doing anything. Any help or advice would be greatly appreciated.
uint8_t Rx_data[100] = "<Hello World\n>";
int baud = 115200;
uint8_t Tx_data[100];
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration-------------------------------------------
-------------*/
/* Reset of all peripherals, Initializes the Flash interface
and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART1_UART_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
// Transmit data via UART
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
// HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5); // Blink
// HAL_Delay(1000); // Delay blink for 1 second
HAL_UART_Receive(&huart1, (uint8_t*)Tx_data, 100, 100); //
Receive comms from ESP32
uint8_t Tx_value = Tx_data;
if(baud != Tx_value) {
HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5); // Blink
HAL_Delay(1000); // Delay blink for 1 second
baud = Tx_value;
Change_baud(baud);
}
HAL_UART_Transmit(&huart2,(uint8_t*) Tx_data, 100, 100); // Transmit comms from ESP32 to terminal
HAL_UART_Transmit(&huart1, Rx_data, sizeof(Rx_data), 100);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
//HAL_UART_Receive(&huart2, Rx_data, 4, 1000);
}
/* USER CODE END 3 */
}
void Change_baud(int baud) {
HAL_UART_DeInit(&huart2);
MX_USART2_UART_Init_baud(baud);
HAL_UART_Receive_IT(&huart2, (uint8_t*)Rx_data, 100);
}
static void MX_USART2_UART_Init_baud(int baud)
{
/* USER CODE BEGIN USART2_Init 0 */
/* USER CODE END USART2_Init 0 */
/* USER CODE BEGIN USART2_Init 1 */
/* USER CODE END USART2_Init 1 */
huart2.Instance = USART2;
huart2.Init.BaudRate = baud;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART2_Init 2 */
/* USER CODE END USART2_Init 2 */
}
I realize this is not the best written code, I'm VERY new to STM32 and how to program it.