On UNO, when serial.print to UART pin 11, nothing comes out of pin 11 The problem: Message prints only to the Arduino IDE's Tools > Serial Monitor, not coming out of TX pin 11. 
Question, please how to get Arduino Uno or Mega to send data out of pin 11?

#include &lt;SoftwareSerial.h&gt;
SoftwareSerial mySerial(12, 13); // RX, TX pins on Arduino
void setup() {
  Serial.begin(9600);
}
void loop() {
  Serial.print("This is a test\n\n");
  delay(1000);
}
Of course it's only coming out on the serial monitor - you are printing it to the hardware UART which comes out on the serial monitor.

You have created a SoftwareSerial object which you are then completely ignoring and then using the HardwareSerial UART object instead, which is on pins 0/1.

If you want to use a SoftwareSerial object you should actually use the SoftwareSerial object.

Replace all the references to Serial with mySerial instead.