Created a small PingPongSensor that demonstrates node-to-node communication and tests communication reliability.

libraries/MySensors/examples/PingPongSensor/MYSLog.h

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+/****
+ * Formatted logging to the Serial console.
+ * Compiled in by setting LOGDEBUG
+ *
+ * 2015-05-25  Bruce Lacey V1.0
+ *
+ * Based upon Arduino Playground prior art and should be moved to
+ * the MySensors library at some point as a common debug logging facility
+ */
+#ifndef MYSLog_h
+#define MYSLog_h
+
+#define LOGDEBUG 1
+
+#if defined ( LOGDEBUG )
+   #define LOG(fmt, args... ) log( fmt, ## args );
+#else
+   #define log(fmt, args... )
+#endif
+
+void log(const char *fmt, ... ) {
+  char buff[128];
+  va_list args;
+  va_start (args, fmt);
+  vsnprintf(buff, sizeof(buff), fmt, args);
+  va_end (args);
+  buff[sizeof(buff)/sizeof(buff[0])-1]='\0';
+  Serial.print(buff);
+}
+
+void log(const __FlashStringHelper *fmt, ... ){
+  char buf[128]; // resulting string limited to 128 chars
+  va_list args;
+  va_start (args, fmt);
+#ifdef __AVR__
+  vsnprintf_P(buf, sizeof(buf), (const char *)fmt, args); // progmem for AVR
+#else
+  vsnprintf(buf, sizeof(buf), (const char *)fmt, args); // for the rest of the world
+#endif
+  va_end(args);
+  Serial.print(buf);
+}
+
+#endif

libraries/MySensors/examples/PingPongSensor/PingPongSensor.ino

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+/***
+ *  This is a simple sketch used to demenstrate and test node-to-node MySensor's communication.
+ *  To use this sketch, assemble MySensors nodes - they need nothing more than a radio
+ *  1.  Flash each node with the same sketch, open the console and type either 0 or 1 to the respective nodes to set thei ID
+ *  2.  You only need to set the node id once, and restart the nodes
+ *  3.  To being a ping-pong test, simply type T in the console for one of the nodes.
+ *
+ *  2015-05-25 Bruce Lacey v1.0
+ */
+ 
+#include <MySensor.h>
+#include <SPI.h>
+#include "MYSLog.h"
+
+#define VSN "v1.0"
+
+// Define two generic nodes with a single child
+#define YING 200
+#define YANG 201
+#define CHILD 1
+
+// Sensor objects
+MySensor gw;
+
+MyMessage mPing(CHILD, V_VAR1);   //Ping message
+MyMessage mPong(CHILD, V_VAR2);   //Pong message
+
+void setup() {
+
+  Serial.begin(115200);
+    
+  gw.begin(incomingMessage);    // Node ids are written to EEPROM during sensor node configuration by entering a 0 or 1
+  gw.present(CHILD, S_CUSTOM);  //
+  
+  gw.sendSketchInfo( nodeTypeAsCharRepresentation( gw.getNodeId() ), VSN );
+  LOG(F("\n%sReady.\n"), nodeTypeAsCharRepresentation(gw.getNodeId()));
+}
+
+void loop() {
+  
+  // Interactive command and control
+  // Entering a number from 0 or 1 will write the node 200 (YING) or 201 (YANG) to EEPROM
+  // Entering T on either node will initiatve a ping-pong test.
+  if (Serial.available()) {
+    byte inChar = Serial.read();
+    uint8_t node = gw.getNodeId();
+    
+    // Manual Test Mode
+    if (inChar == 'T' || inChar == 't') {
+      LOG(F("T received - starting test...\n"));
+      MyMessage msg = mPong;
+      msg.sender = (node == YING ? YANG : YING);
+      sendPingOrPongResponse( msg );     
+    }
+    else if (inChar == '0' or inChar == '1') {
+      byte nodeID = 200 + (inChar - '0');
+      setNodeId(nodeID);
+    }
+    else {
+      LOG("Invalid input\n");
+    }
+  }
+
+  // Process sensor messages
+  gw.process();
+}
+
+void incomingMessage(const MyMessage &message) {
+  
+  LOG(F("Received %s from %s\n"), msgTypeAsCharRepresentation((mysensor_data)message.type), nodeTypeAsCharRepresentation(message.sender));
+
+  delay(250);
+  sendPingOrPongResponse( message );  
+}
+
+void sendPingOrPongResponse( MyMessage msg ) {
+  
+  MyMessage response = (msg.type == V_VAR1 ? mPong : mPing);
+ 
+  LOG(F("Sending %s to %s\n"), msgTypeAsCharRepresentation( (mysensor_data)response.type ), nodeTypeAsCharRepresentation(msg.sender));
+  
+  // Set payload to current time in millis to ensure each message is unique
+  response.set( millis() );
+  response.setDestination(msg.sender);
+  gw.send(response);
+}
+
+void setNodeId(byte nodeID) {
+  LOG(F("Setting node id to: %i.\n***Please restart the node for changes to take effect.\n"), nodeID);
+  eeprom_write_byte((uint8_t*)EEPROM_NODE_ID_ADDRESS, (byte)nodeID);
+}
+
+const char * msgTypeAsCharRepresentation( mysensor_data mType ) {
+  return mType == V_VAR1 ? "Ping" : "Pong";
+}
+
+const char * nodeTypeAsCharRepresentation( uint8_t node ) {
+  return node == YING ? "Ying Node" : "Yang Node";
+}