Colony

/* Eugene Marinelli

 * 10/5/06

 * sendpacket - sends a packet through the xbee dongle

 */

#include <stdio.h>

#include <string.h>

#include "wireless.h"

#define SERIAL_PORT "/dev/ttyS0"

#define SERVER_ID 213

int message_length = 15;

int main(int argc, char** argv){

  FILE* serial = fopen(SERIAL_PORT, "w");

  WL_Packet pkt;

  int i;

  if(argc < 2){

    fprintf(stderr, "Error: no packet content specified.\n");

    return -1;

  }

  fprintf(stderr, "Sending message: %s\n", argv[1]);

  wl_create_packet(argv[1], SERVER_ID, GLOBAL_DEST, &pkt);

  printf("%x %x %x %x\n", pkt.prefix[0], pkt.prefix[1], pkt.src, pkt.dest);

  fprintf(serial, "%c%c%c%c", pkt.prefix[0], pkt.prefix[1], pkt.src, pkt.dest);

  for(i = 0; i < message_length; i++){

    fprintf(serial, "%c", pkt.msg[i]);

  }

  fprintf(serial, "%c", pkt.checksum);

  fclose(serial);

  return 0;

}

char wl_get_checksum(WL_Packet* packet){

  char checksum = 0;

  int i;

  checksum += packet->src;

  checksum += packet->dest;

  for(i = 0; i < message_length; i++) {

    checksum += packet->msg[i];

  }

  return checksum;

}

int wl_create_packet(char* msg, char src, char dest, WL_Packet* packet){

  packet->prefix[0] = 'R';

  packet->prefix[1] = 'C';

  packet->src = src;

  packet->dest = dest;

  memset(packet->msg, 0, message_length);

  strcpy(packet->msg, msg);

  packet->checksum = wl_get_checksum(packet);

  printf("checksum: %d\n", packet->checksum);

  return 0;

}