Added sendRegistration function.

src/main.cpp

@@ -49,6 +49,16 @@ void setup() {
   radio.printDetails();
 
   // Start the radio listening for data
+}
+
+void sendRegistration(void) {
+  char sendBuffer[32];
+
+  memset(sendBuffer, 0, 32);
+  sendBuffer[0] = 'r';
+  strncpy(sendBuffer+1, "testClient", 10);
+  radio.stopListening();
+  radio.write(sendBuffer, 11);
   radio.startListening();
 }