Incr delay in stopListening(); Fix transfer example

- Testing with Arduino & RPi indicates delay needs to be increased
slightly before flushing tx_fifo
- Fix addresses in RPi transfer example, and add stopListening()

RF24.cpp

@@ -757,7 +757,7 @@ void RF24::stopListening(void)
   delayMicroseconds(230);
   
   if(read_register(FEATURE) & _BV(EN_ACK_PAY)){
-    delayMicroseconds(170);
+    delayMicroseconds(200);
 	flush_tx();
   }
   //flush_rx();

examples_RPi/transfer.cpp

@@ -83,11 +83,12 @@ int main(int argc, char** argv){
 /***********************************/
 
     if ( role == role_ping_out )    {
-      radio.openWritingPipe(addresses[0]);
-      radio.openReadingPipe(1,addresses[1]);
-    } else {
       radio.openWritingPipe(addresses[1]);
       radio.openReadingPipe(1,addresses[0]);
+	  radio.stopListening();
+    } else {
+      radio.openWritingPipe(addresses[0]);
+      radio.openReadingPipe(1,addresses[1]);
       radio.startListening();
     }
 
@@ -113,6 +114,7 @@ int main(int argc, char** argv){
       			if(!radio.writeFast(&data,32)){     //Write to the FIFO buffers
         			counter++;                      //Keep count of failed payloads
       			}
+
 				
 				//This is only required when NO ACK ( enableAutoAck(0) ) payloads are used
 		/*		if(millis() - pauseTime > 3){       // Need to drop out of TX mode every 4ms if sending a steady stream of multicast data