SIM800 does not take commands, I receive echos of commands

Question

I am trying to get SIM800l to send text messages and make calls with STM32F103. Problem is, I only receive echoes of my commands, if I send "AT" using uart, I get A, T as an echo. But not OK, as it should respond. My power supply is good and I am pretty sure my UART code is good too.

Does anybody had the same issue? Thank you!

    void uart_init2(){
     UART1_Init_Advanced(115200, _UART_8_BIT_DATA, _UART_NOPARITY, _UART_ONE_STOPBIT, &_GPIO_MODULE_USART1_PA9_10);
     USART1_CR1.B5  = 1;
     NVIC_IntEnable(IVT_INT_USART1);
}
char UART1_Read2(){
   while (!(USART1_SR & USART1_SR.B5));  // Wait until RXNE (RX not empty) bit is set
        // USART resets the RXNE flag automatically after reading DR
        return ((char)USART1_DR); // & 0xFF));
   }
void InterruptModule_1() iv IVT_INT_USART1 ics ICS_AUTO {
   receive = UART1_Read();
   buffer[buffernum++]=receive;
   }

And in main:

buffernum=0;
UART1_Write_Text("ATE0");
UART1_Write_Text("AT");
delay_ms(1000);
delay_ms(1000);
//UART1_Write_Text("AT+IPR=9600");
buffernum=0;
UART1_Write_Text("ATDXXXXXX;");
delay_ms(1000);
delay_ms(1000);

The result in the buffer after the code is:

Answer 1

I have found the solution. Not sure why, but everything works as expected when I add \r with the command. Example:

UART1_Write_Text("AT\r");

Hope this helps somebody, I did not find anything similar online.