Two Port Receive

/*

  Software serial multple serial test

 Receives from the two software serial ports,

 sends to the hardware serial port.

 In order to listen on a software port, you call port.listen().

 When using two software serial ports, you have to switch ports

 by listen()ing on each one in turn. Pick a logical time to switch

 ports, like the end of an expected transmission, or when the

 buffer is empty. This example switches ports when there is nothing

 more to read from a port

 The circuit:

 Two devices which communicate serially are needed.

 * First serial device's TX attached to digital pin 10(RX), RX to pin 11(TX)

 * Second serial device's TX attached to digital pin 8(RX), RX to pin 9(TX)

 Note:

 Not all pins on the Mega and Mega 2560 support change interrupts,

 so only the following can be used for RX:

 10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69

 Not all pins on the Leonardo support change interrupts,

 so only the following can be used for RX:

 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).

 created 18 Apr. 2011

 modified 19 March 2016

 by Tom Igoe

 based on Mikal Hart's twoPortRXExample

 This example code is in the public domain.

 */

#include <SoftwareSerial.h>
// software serial #1: RX = digital pin 10, TX = digital pin 11

SoftwareSerial portOne(10, 11);

// software serial #2: RX = digital pin 8, TX = digital pin 9
// on the Mega, use other pins instead, since 8 and 9 don't work on the Mega

SoftwareSerial portTwo(8, 9);

void setup() {

  // Open serial communications and wait for port to open:

  Serial.begin(9600);

  while (!Serial) {

    ; // wait for serial port to connect. Needed for native USB port only

  }

  // Start each software serial port

  portOne.begin(9600);

  portTwo.begin(9600);
}

void loop() {

  // By default, the last intialized port is listening.

  // when you want to listen on a port, explicitly select it:

  portOne.listen();

  Serial.println("Data from port one:");

  // while there is data coming in, read it

  // and send to the hardware serial port:

  while (portOne.available() > 0) {

    char inByte = portOne.read();

    Serial.write(inByte);

  }

  // blank line to separate data from the two ports:

  Serial.println();

  // Now listen on the second port

  portTwo.listen();

  // while there is data coming in, read it

  // and send to the hardware serial port:

  Serial.println("Data from port two:");

  while (portTwo.available() > 0) {

    char inByte = portTwo.read();

    Serial.write(inByte);

  }

  // blank line to separate data from the two ports:

  Serial.println();
}