Arduino for STM32

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#include <SoftwareSerial.h>

HardwareSerial Serial1(USART1);   // or HardWareSerial Serial2 (PA3, PA2);
SoftwareSerial mySerial(PA3, PA2, true); // RX, TX

void setup() {
  // Open serial communications and wait for port to open:
  Serial1.begin(57600);
  while (!Serial1) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  delay(2000);
  Serial1.println("Start");

  mySerial.begin(57600);
}

void loop() { // run over and over
  if (mySerial.available()) {
    Serial1.write(mySerial.read());
  }
}