<s>[INST] #include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); // RX, TX

void setup() {
  mySerial.begin(9600);
  Serial.begin(9600);
}

void loop() {
  if (mySerial.available() > 0) {
    Serial.write(mySerial.read());
  }
}

This will only echo the serial data from my serial connection to the USB serial. It will not read from the USB serial. How to read serial data also from USB serial?[/INST]