How to read and compare data by UART in STM32f4?

Question

C++ / C#

Good afternoon, I tied bluetooth to the board and I'm trying to read and compare data through the com port

void UART4_IRQHandler(void)
{
  static int cnt = 0;
  if( USART_GetITStatus(UART4, USART_IT_RXNE) != RESET)
  {
    USART_ClearITPendingBit(UART4, USART_IT_RXNE);
    char ch = UART4->DR;
    if(ch != '\n')
    {
        received_str[cnt] = ch;
        cnt++;
    }
    else
    {
      received_str[cnt] = '\0'; 
      cnt = 0;
      if (USART_GetFlagStatus(UART4, USART_FLAG_RXNE)==RESET)
      {
        LED_Flag = 1;
        LED_Command = (int)received_str;
        USART_puts(UART4, LED_Command); // здесь выводит мое введенное число
        USART_puts(UART4, "\n");
      }
    }
  }
}

comparison of received data

main.c
...
while(1)
{
   switch (LED_Command)
   {
     case 500: USART_puts(UART4, "LED_Command = 500"); break;
     case 600: USART_puts(UART4, "LED_Command = 600"); break;
     case 700: USART_puts(UART4, "LED_Command = 700"); break;
   }
}

and the output code

void USART_puts(USART_TypeDef *USARTx, volatile char *str)
{
  while(*str)
  {
    while(USART_GetFlagStatus(UART4, USART_FLAG_TC) == RESET);
    USART_SendData(USARTx, *str);
    *str++;
  }
}

When I enter 500, 600 or 700 in the terminal, UART4_IRQHandler displays them correctly, but for some reason in switch it thinks that LED_Command is not equal to these values

Answer 1

received_str you have an array of characters? (int)received_str; - never converting a string to a number.

Answer 2

And how then to convert to the type int
tried so
in the terminal now it is not clear what is displayedq.