ESP32 USB to UART proxy

serial_uart_esp32_proxy.c

void setup() {
  Serial.begin(230400,SERIAL_8N1);
  Serial1.begin(230400, SERIAL_8N1, 21, 22);
}

int n;
void loop() {
  n = Serial1.available();
  if (n != 0)
  {
    char y = Serial1.read();
    Serial.write(y);
  }

  
  n = Serial.available();
  if (n != 0)
  {
    char y = Serial.read();
    Serial1.write(y);
  }
}