Hi I am sending a AT command through USART2 -char CGSN[] = "AT+CGSN\r\n";HAL_UART_Transmit(&huart2,(uint8_t *)CGSN, sizeof(CGSN),100);HAL_Delay(500); HAL_UART_Receive_IT(&huart2,(uint8_t *)&ch,1);I am receiving ch in callback and storing each byte ...