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+/*
+  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 2, RX to pin 3
+ * Second serial device's TX attached to digital pin 4, RX to pin 5
+ 
+ created 18 Apr. 2011
+ modified 9 Apr 2012
+ by Tom Igoe
+ based on Mikal Hart's twoPortRXExample
+ 
+ This example code is in the public domain.
+ 
+ */
+
+#include <SoftwareSerial.h>
+// software serial #1: TX = digital pin 2, RX = digital pin 3
+SoftwareSerial portOne(2, 3);
+
+// software serial #2: TX = digital pin 4, RX = digital pin 5
+SoftwareSerial portTwo(4, 5);
+
+void setup()
+{
+ // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+   while (!Serial) {
+    ; // wait for serial port to connect. Needed for Leonardo 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();
+}
+
+
+
+
+
+