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magic number - sizes of packets

This commit is contained in:
Gerolf Ziegenhain 2015-01-04 13:19:56 +01:00
parent a2200a4aa6
commit 9d540cf369
1 changed files with 21 additions and 15 deletions
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36
src/irmc.c
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@ -34,17 +34,20 @@
#define MAXDATASIZE 1024 // max number of bytes we can get at once
#define DIS 0x0002
#define DAT 0x0003
#define DIS 0x0002 // for command packet
#define DAT 0x0003 // for command packet
#define CON 0x0004
#define ACK 0x0005
#define DEBUG 0
// This structure will be used to (dis-)connect to KOB servers
struct command_packet_format{
unsigned short command;
unsigned short channel;
unsigned short command; // CON / DIS
unsigned short channel; // Channel number
};
#define SIZE_COMMAND_PACKET 4
// This structure will be used for id, rx and tx packets
struct data_packet_format{
unsigned short command;
unsigned short length;
@ -60,6 +63,9 @@ struct data_packet_format{
char a4[8];
};
#define SIZE_DATA_PACKET 496
// This structure is not used.
/*
struct code_packet_format{
unsigned short command;
unsigned short length;
@ -74,13 +80,14 @@ struct code_packet_format{
char a3[128];
char a4[8];
};
*/
struct command_packet_format connect_packet;
struct command_packet_format disconnect_packet = {DIS, 0};
struct data_packet_format id_packet;
struct data_packet_format rx_data_packet;
struct data_packet_format tx_data_packet;
int serial_status = 0, fd_speaker, fd_serial, fd_socket, numbytes;
int serial_status = 0, fd_serial, fd_socket, numbytes;
int tx_sequence = 0, rx_sequence;
double tx_timeout = 0;
@ -159,17 +166,16 @@ identifyclient(void)
{
tx_sequence++;
id_packet.sequence = tx_sequence;
send(fd_socket, &connect_packet, sizeof(connect_packet), 0);
send(fd_socket, &id_packet, 496, 0);
send(fd_socket, &connect_packet, SIZE_COMMAND_PACKET, 0);
send(fd_socket, &id_packet, SIZE_DATA_PACKET, 0);
}
void
inthandler(int sig)
{
signal(sig, SIG_IGN);
send(fd_socket, &disconnect_packet, sizeof(disconnect_packet), 0);
send(fd_socket, &disconnect_packet, SIZE_COMMAND_PACKET, 0);
close(fd_socket);
close(fd_speaker);
close(fd_serial);
exit(1);
}
@ -226,7 +232,7 @@ commandmode(void)
tx_data_packet.code[0] = -1;
tx_data_packet.code[1] = 1;
tx_data_packet.n = 2;
for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, 496, 0);
for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, SIZE_DATA_PACKET, 0);
tx_data_packet.n = 0;
return 0;
}
@ -237,7 +243,7 @@ commandmode(void)
tx_data_packet.code[0] = -1;
tx_data_packet.code[1] = 2;
tx_data_packet.n = 2;
for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, 496, 0);
for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, SIZE_DATA_PACKET, 0);
tx_data_packet.n = 0;
return 0;
}
@ -397,8 +403,8 @@ int main(int argc, char *argv[])
if(tx_timer == 0)
if((numbytes = recv(fd_socket, buf, MAXDATASIZE-1, 0)) == -1)
usleep(250);
if(numbytes == 496 && tx_timer == 0){
memcpy(&rx_data_packet, buf, 496);
if(numbytes == SIZE_DATA_PACKET && tx_timer == 0){
memcpy(&rx_data_packet, buf, SIZE_DATA_PACKET);
#if DEBUG
printf("length: %i\n", rx_data_packet.length);
printf("id: %s\n", rx_data_packet.id);
@ -451,7 +457,7 @@ beep(1000.0, length/1000.);
if(tx_data_packet.n > 1 ){
tx_sequence++;
tx_data_packet.sequence = tx_sequence;
for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, 496, 0);
for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, SIZE_DATA_PACKET, 0);
#if DEBUG
printf("irmc: sent data packet.\n");
#endif
@ -482,7 +488,7 @@ beep(1000.0, length/1000.);
}
} /* End of mainloop */
send(fd_socket, &disconnect_packet, sizeof(disconnect_packet), 0);
send(fd_socket, &disconnect_packet, SIZE_COMMAND_PACKET, 0);
close(fd_socket);
close(fd_serial);