 
   if (txTimer.isExpired()) {
     // Send message every second
-    radio.print("Send a message");
+    Serial.println("Sending message"); 
+    radioPtr->print("Send a message");
     txTimer.start(1000, AsyncDelay::MILLIS);
   }
 

/*
 * Example sketch of how the begin() function can be used to check
 * whether the RFM12B is fitted, and to fall back to using a XRF/XBee
 * radio if it is not. By using a reference to a Stream object this
 * concept can be used to easily create a single firmware image which
 * supports both types of hardware.
 *
 * Copyright S R Marple, 2013.
 * Released under MIT License, http://opensource.org/licenses/mit-license.php
 */



 * not exist (eg ATtiny). Use RF12_Stream::begin() in setup() to point
 * the reference to Serial if the RFM12B is not found.
 */
Stream *radioPtr;

AsyncDelay txTimer;

