Send and transmit using radio works now. Sends initial request for registration.

src/clockMsg.h

@@ -5,10 +5,14 @@
 
 struct clockMsg_s {
   uint8_t msgType;
+  uint8_t day;
   uint8_t hour;
   uint8_t minute;
   uint8_t second;
+  uint8_t speed; // msPerModelSecond / 4 --> 0..250
 };
-#define msgType_Clock 'c'
+#define msgType_Clock 'c'  /* clock update, sent by master using broadcast */
+#define msgType_ReqReg 'R' /* Request Registration, sent by Master using broadcast; ask clients to register */
+#define msgType_Reg 'r' /* Registration message, sent by Client using 1:1 message to master */
 
 #endif