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The definition of data packet

Quincy13586
Prodigy 30 points

The definition of data packet received in ZigBee stack 2006 is in AF.h, which is
typedef struct
{
  osal_event_hdr_t hdr;
  uint16 groupId;
  uint16 clusterId;
  afAddrType_t srcAddr;
  byte endPoint;
  byte wasBroadcast;
  byte LinkQuality;
  byte SecurityUse;
  uint32 timestamp;
  afMSGCommandFormat_t cmd;
} afIncomingMSGPacket_t;
I found timestamp is not calculated in neither second nor millisecond, so what is the unit of timestamp? Can it be used to record the time when a node receives data?