packet.h

主要用于无线传感网络的编写的书籍.对于初学者有着很大的用处

#ifndef __PACKET__
#define __PACKET__
#include "../../types/types.h"
#include "../link/frame.h"

#ifndef SUCCESS
#define SUCCESS 1
#define FAILURE 0
#endif

#ifndef TRUE
#define TRUE  1
#define FALSE 0
#endif

#define WRITEADDRESS 0xFFFF

typedef struct {
  uint16_t address; // on packet reception, this is TOS_UART_ADDR (0x7E), on transmission, this is destination
  uint8_t port; // this is referred to as "type" in tos/system/AM.h and is number of parametrized interface
  uint8_t group; // same as in AM.h
  uint8_t length; // length of data in bytes
} __attribute__((packed)) TOS_Hdr;

#define PKT_MAX_DATA_SIZE (MTU - sizeof(TOS_Hdr) - 2) // the "- 2" is for the crc

typedef struct {
  TOS_Hdr hdr;
  uint8_t  data[PKT_MAX_DATA_SIZE];
} networkPkt; 

// monitors serial port until a packet is read successfully, returns SUCCESS or FAILURE
int readNetworkPkt(int serial_port_fd, networkPkt *p);

// sends a packet over the serial port, returns SUCCESS or FAILURE
int writeNetworkPkt(int serial_port_fd, networkPkt *p);

// prints a packet to output_file_descriptor
void printPacket(int debug_type, int debug_level, FILE *output_file_descriptor, networkPkt *p);


#endif