message_t

//message.h

#include "platform_message.h"


#ifndef TOSH_DATA_LENGTH
#define TOSH_DATA_LENGTH 28
#endif


#ifndef TOS_BCAST_ADDR
#define TOS_BCAST_ADDR 0xFFFF
#endif


typedef nx_struct message_t {
  nx_uint8_t header[sizeof(message_header_t)];
  nx_uint8_t data[TOSH_DATA_LENGTH];
  nx_uint8_t footer[sizeof(message_footer_t)];
  nx_uint8_t metadata[sizeof(message_metadata_t)];
} message_t;


/*
 * This resource is used to arbitrate access between ActiveMessageC,
 * Ieee154MessageC and possibly future MessageC components to the 
 * underlying radio driver.
 */
#define RADIO_SEND_RESOURCE "RADIO_SEND_RESOURCE"

//platform_message.h

typedef union message_header {
  cc2420_header_t cc2420;
  serial_header_t serial;
} message_header_t;


typedef union TOSRadioFooter {
  cc2420_footer_t cc2420;
} message_footer_t;


typedef union TOSRadioMetadata {
  cc2420_metadata_t cc2420;
  serial_metadata_t serial;
} message_metadata_t;

//CC2420.h

typedef uint8_t cc2420_status_t;


#if defined(TFRAMES_ENABLED) && defined(IEEE154FRAMES_ENABLED)
#error "Both TFRAMES and IEEE154FRAMES enabled!"
#endif


/**
 * CC2420 header definition.
 * 
 * An I-frame (interoperability frame) header has an extra network 
 * byte specified by 6LowPAN
 * 
 * Length = length of the header + payload of the packet, minus the size
 *   of the length byte itself (1).  This is what allows for variable 
 *   length packets.
 * 
 * FCF = Frame Control Field, defined in the 802.15.4 specs and the
 *   CC2420 datasheet.
 *
 * DSN = Data Sequence Number, a number incremented for each packet sent
 *   by a particular node.  This is used in acknowledging that packet, 
 *   and also filtering out duplicate packets.
 *
 * DestPan = The destination PAN (personal area network) ID, so your 
 *   network can sit side by side with another TinyOS network and not
 *   interfere.
 * 
 * Dest = The destination address of this packet. 0xFFFF is the broadcast
 *   address.
 *
 * Src = The local node ID that generated the message.
 * 
 * Network = The TinyOS network ID, for interoperability with other types
 *   of 802.15.4 networks. 
 * 
 * Type = TinyOS AM type.  When you create a new AMSenderC(AM_MYMSG), 
 *   the AM_MYMSG definition is the type of packet.
 * 
 * TOSH_DATA_LENGTH defaults to 28, it represents the maximum size of 
 * the payload portion of the packet, and is specified in the 
 * tos/types/message.h file.
 *
 * All of these fields will be filled in automatically by the radio stack 
 * when you attempt to send a message.
 */
/**
 * CC2420 Security Header
 */
typedef nx_struct security_header_t {
  nx_uint8_t secLevel:3;
  nx_uint8_t keyMode:2;
  nx_uint8_t reserved:3;
  nx_uint32_t frameCounter;
  nx_uint8_t keyID[1]; // One byte for now
} security_header_t;


typedef nx_struct cc2420_header_t {
  nxle_uint8_t length;
  nxle_uint16_t fcf;
  nxle_uint8_t dsn;
  nxle_uint16_t destpan;
  nxle_uint16_t dest;
  nxle_uint16_t src;
  /** CC2420 802.15.4 header ends here */
#ifdef CC2420_HW_SECURITY
  security_header_t secHdr;
#endif
  
#ifndef TFRAMES_ENABLED
  /** I-Frame 6LowPAN interoperability byte */
  nxle_uint8_t network;
#endif


  nxle_uint8_t type;
} cc2420_header_t;


/**
 * CC2420 Packet Footer
 */
typedef nx_struct cc2420_footer_t {
} cc2420_footer_t;


/**
 * CC2420 Packet metadata. Contains extra information about the message
 * that will not be transmitted.
 *
 * Note that the first two bytes automatically take in the values of the
 * FCS when the payload is full. Do not modify the first two bytes of metadata.
 */
typedef nx_struct cc2420_metadata_t {
  nx_uint8_t rssi;
  nx_uint8_t lqi;
  nx_uint8_t tx_power;
  nx_bool crc;
  nx_bool ack;
  nx_bool timesync;
  nx_uint32_t timestamp;
  nx_uint16_t rxInterval;


  /** Packet Link Metadata */
#ifdef PACKET_LINK
  nx_uint16_t maxRetries;
  nx_uint16_t retryDelay;
#endif
} cc2420_metadata_t;




typedef nx_struct cc2420_packet_t {
  cc2420_header_t packet;
  nx_uint8_t data[];
} cc2420_packet_t;