+ * Author: Miklos Maroti, Brano Kusy
+ *
+ * Interface for one hop time synchronization. Allows to modify timesync
+ * messages in the MAC layer with elapsed time of an event (ETA timesync
+ * primitive). Interface also provides a command to determine offset within
+ * a CC2420 packet, where the timesync ETA value is stored. word 'timestamping'
+ * used in describing commands does not refer to metadata.timestamp value,
+ * rather it refers to the timesync ETA timestamp which is part of data
+ * payload and is transmitted over the air.