time sync fixup time

include/timesync.h

@@ -8,7 +8,7 @@
 
 //#define TIME_SYNC_TRIGGER 100 // threshold for time sync [milliseconds]
 #define TIME_SYNC_FRAME_LENGTH 0x05 // timeserver answer frame length [bytes]
-#define TIME_SYNC_FIXUP 6 // calibration to fixup processing time [milliseconds]
+#define TIME_SYNC_FIXUP 4 // calibration to fixup processing time [milliseconds]
 
 void timesync_init(void);
 void send_timesync_req(void);