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steffven
Joined: 19 May 2008
Posts: 28
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 Posted: Sat Jun 14, 2008 12:40 am Post subject: Send broadcast message from a server |
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I set up a tcp server on my psp.
Now i want to send a broadcast message (192.168.2.255), but how?
It's no problem for me to send messages to registered clients, but i don't know how to send broadcast messages.
Can someone plz help me? |
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pspZorba
Joined: 22 Sep 2007
Posts: 156
Location: NY
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| Posted: Sat Jun 14, 2008 3:15 am Post subject: |
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take a look at UDP
_________________
--pspZorba--
NO to K1.5 ! |
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steffven
Joined: 19 May 2008
Posts: 28
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| Posted: Sat Jun 14, 2008 6:54 am Post subject: |
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| Code: | void test()
{
int sockfd;
struct sockaddr_in their_addr;
struct hostent *he;
int numbytes;
int broadcast = 1;
char szMyIPAddr[32];
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &broadcast,
sizeof broadcast) == -1) {
perror("setsockopt (SO_BROADCAST)");
exit(1);
}
their_addr.sin_family = AF_INET;
their_addr.sin_port = htons(SERVER_PORT);
their_addr.sin_addr = *((struct in_addr *)he->h_addr);
memset(their_addr.sin_zero, '\0', sizeof their_addr.sin_zero);
numbytes=sendto(sockfd, szMyIPAddr, strlen(szMyIPAddr), 0,
(struct sockaddr *)&their_addr, sizeof their_addr);
close(sockfd);
} |
That's all I got for now, but this code won't work, why?
As soon as this code is entered, the WLAN Light goes off and my psp gets stuck?!? |
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pspZorba
Joined: 22 Sep 2007
Posts: 156
Location: NY
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| Posted: Sun Jun 15, 2008 12:25 am Post subject: |
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you use the variable
| Code: | | struct hostent *he; |
in
| Code: | | their_addr.sin_addr = *((struct in_addr *)he->h_addr); |
without initializing it, this probably why you have a crash.
same for : szMyIPAddr
---------------------
I am really far from being a UDP specialist (actually only played with it long long ago), but if I remember well, the address you should send your to-be-broadcasted message is something like x.x.x.255 or may be 255.255.255.255
on the client side the ip is (still if I remember well) x.x.x.0 or 0.0.0.0
[edit]
btw in
| Code: | | sockfd = socket(AF_INET, SOCK_DGRAM, 0); |
you should use PF_INET instead of AF_INET (most often PF_INET equals AF_INET but it is not guaranted)
[/edit]
_________________
--pspZorba--
NO to K1.5 ! |
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steffven
Joined: 19 May 2008
Posts: 28
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| Posted: Sun Jun 15, 2008 3:36 am Post subject: |
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Ok, i rewrote the code but it still won't work; my psp doesn't hang anymore, but i don't receive anything. My Code:
| Code: | void test()
{
int sockfd;
struct sockaddr_in name;
char sendnumber[10] = "pspiprec";
name.sin_family = AF_INET;
name.sin_port = htons(673);
name.sin_addr.s_addr = INADDR_BROADCAST;
sockfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
int broadcast = 1;
setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, (char*)&broadcast, 1);
connect(sockfd, (struct sockaddr *) &name, sizeof(name));
send(sockfd, sendnumber, sizeof(sendnumber), 0);
sceKernelDelayThread(500 * 1000);
close(sockfd);
} |
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pspZorba
Joined: 22 Sep 2007
Posts: 156
Location: NY
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| Posted: Sun Jun 15, 2008 5:09 am Post subject: |
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I remember now that you have to use sendTo and recvFrom (and not send and recv)
And as far as I remember there is neither "connect" nor "listen/accept" to do (since you "sendto" to everybody and "recvFrom" from anybody ) but there is still the bind
so on the sender side you should have someting like:
-creation of the socket
-sendTo msg to 255.255.255.255 : port
on the receivers side you should have something like
-creation of the socket
-bind socket to o.o.o.o : port
- recvFrom from socket
_________________
--pspZorba--
NO to K1.5 ! |
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steffven
Joined: 19 May 2008
Posts: 28
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| Posted: Sun Jun 15, 2008 9:04 pm Post subject: |
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| Code: | void test()
{
int sockfd;
struct sockaddr_in name;
char sendnumber[8] = "pspiprec";
int leng = 8;
int broadcast = 1;
name.sin_family = PF_INET;
name.sin_port = htons(673);
name.sin_addr.s_addr = inet_addr("255.255.255.255");
sockfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, (char*)&broadcast, 1);
sendto(sockfd, sendnumber, strlen(sendnumber), 0, (struct sockaddr *) &name, leng);
sceKernelDelayThread(500 * 1000);
close(sockfd);
} |
Still not working and I have no idea why -.- |
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pspZorba
Joined: 22 Sep 2007
Posts: 156
Location: NY
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| Posted: Mon Jun 16, 2008 12:13 am Post subject: |
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Ok at first sight that looks good for this part.
What does return sendTo ?
and could you provide the code that should receive the message?
is there a firewall ? if yes does it allow UDP message on the port 673?
btw you should choose a port above 1024, this port could be already used by the system (isn't it used by MS Exchange?)
to be clean:
name.sin_family = PF_INET; <= AF_INT ( A for Address)
socket(PF_INET, ..) <= correct (P for Protocol)
but it is not the problem
_________________
--pspZorba--
NO to K1.5 ! |
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steffven
Joined: 19 May 2008
Posts: 28
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| Posted: Mon Jun 16, 2008 3:07 am Post subject: |
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| pspZorba wrote: | name.sin_family = PF_INET; <= AF_INT ( A for Address)
socket(PF_INET, ..) <= correct (P for Protocol) |
Corrected.
| Code: | void test()
{
int sockfd;
struct sockaddr_in name;
char sendnumber[8] = "pspiprec";
int leng = 8;
int broadcast = 1;
int abc = 0;
name.sin_family = AF_INET;
name.sin_port = htons(673);
name.sin_addr.s_addr = inet_addr("255.255.255.255");
sockfd = socket(PF_INET, SOCK_DGRAM, 0);
abc = setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &broadcast, sizeof(broadcast)); //(char*)
printf("%d", abc); //<--- Returns 0
abc = sendto(sockfd, sendnumber, strlen(sendnumber), 0, (struct sockaddr *) &name, leng);
printf("%d", abc); //<--- Returns 1 !!!
sceKernelDelayThread(500 * 1000);
close(sockfd);
} |
So there's my fault, but I don't understand what's wrong^^ |
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steffven
Joined: 19 May 2008
Posts: 28
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| Posted: Mon Jun 16, 2008 3:15 am Post subject: |
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Yeah I got it!
| Code: | void test()
{
int sockfd;
struct sockaddr_in name;
char sendnumber[8] = "pspiprec";
int leng = 8;
int broadcast = 1;
int abc = 0;
name.sin_family = AF_INET;
name.sin_port = htons(673);
name.sin_addr.s_addr = inet_addr("255.255.255.255");
sockfd = socket(PF_INET, SOCK_DGRAM, 0);
abc = setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &broadcast, sizeof(broadcast)); //(char*)
printf("%d", abc);
abc = sendto(sockfd, sendnumber, leng, 0, (struct sockaddr *) &name, sizeof(name)); // Here was my fault! Not leng but sizeof(name)
printf("%d", abc);
sceKernelDelayThread(500 * 1000);
close(sockfd);
} |
Stupid fault xD
But thanks to you pspZorba for all your help! |
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