SoftwareSerial: listen()

// set up a new serial port
SoftwareSerial mySerial =  SoftwareSerial(rxPin, txPin);

mySerial.listen()

#include <SoftwareSerial.h>
 
// software serial : TX = digital pin 10, RX = digital pin 11
SoftwareSerial portOne(10, 11);
 
// software serial : TX = digital pin 8, RX = digital pin 9
SoftwareSerial portTwo(8, 9);
 
void setup()
{
  // Start the hardware serial port
  Serial.begin(9600);
 
  // Start both software serial ports
  portOne.begin(9600);
  portTwo.begin(9600);
 
}
 
void loop()
{
  portOne.listen();
 
  if (portOne.isListening()) {
    Serial.println("Port One is listening!"); 
  } else {
    Serial.println("Port One is not listening!"); 
  }
 
  if (portTwo.isListening()) {
    Serial.println("Port Two is listening!"); 
  } else {
    Serial.println("Port Two is not listening!"); 
  }
 
}