timesync code refactored

include/timesync.h

@@ -5,12 +5,11 @@
 #include "irqhandler.h"
 #include "timekeeper.h"
 
-#define TIME_SYNC_FRAME_LENGTH 0x07 // timeserver answer frame length [bytes]
+#define TIME_SYNC_FRAME_LENGTH 6 // timeserver answer frame length [bytes]
 #define TIME_SYNC_FIXUP 16 // compensation for processing time [milliseconds]
-#define TIMEREQUEST_MAX_SEQNO 0xfe // threshold for wrap around seqno
-#define TIMEREQUEST_END                                                        \
-  (TIMEREQUEST_MAX_SEQNO + 1) // marker for end of timesync handshake
-#define GPS_UTC_DIFF 315964800
+#define TIMEREQUEST_MAX_SEQNO 0xfe // threshold for wrap around seqNo
+#define TIMEREQUEST_END (TIMEREQUEST_MAX_SEQNO + 1) // end of handshake marker
+#define GPS_UTC_DIFF 315964800 // seconds diff between gps and utc epoch
 
 enum timesync_t {
   timesync_tx,