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mazen82
Joined: 10 Sep 2009
Posts: 22
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| TCP Connection not established |
 Posted: Wed Oct 07, 2009 2:57 pm |
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Hi,
I am using the pic18f97j60 with the ccs tcs/ip stack. I was able to get ethernet connection to a laptop and can see data on a webpage. So I created my own function to be able to talk to a device using the tcp protocol, but TCPIsConnected(HTTPSocket) returns false and I don't see any problem. It is basically stuck in the case HTTP_ST_WAIT_CONNECT.
The below is the function code:
| Code: |
void mytask(void)
{
static enum {HTTP_ST_CONNECT=0, HTTP_ST_WAIT_CONNECT=1, HTTP_ST_GET=2,
HTTP_ST_PUT=3, HTTP_ST_DISCONNECT=4} state=0;
static TICKTYPE timeout_counter;
static char lc, lc2;
char c;
char content[250];
int8 a0;
#if !STACK_USE_CCS_PICENS
int8 a1;
#endif
if (HTTPSocket==INVALID_SOCKET)
state=HTTP_ST_CONNECT;
else if (!TCPIsConnected(HTTPSocket))
state=HTTP_ST_WAIT_CONNECT;
else if (TickGetDiff(TickGet(), timeout_counter) > TICKS_PER_SECOND*60)
state=HTTP_ST_DISCONNECT;
switch(state)
{
case HTTP_ST_CONNECT:
//SHOUTCAST_PORT = 80;
/* remoteNode.IPAddr.v[0] = 192;
remoteNode.IPAddr.v[1] = 168;
remoteNode.IPAddr.v[2] = 0;
remoteNode.IPAddr.v[3] = 1;
remoteNode.MACAddr.v[0] = 0;
remoteNode.MACAddr.v[1] = 128;
remoteNode.MACAddr.v[2] = 174;
remoteNode.MACAddr.v[3] = 169;
remoteNode.MACAddr.v[4] = 236;
remoteNode.MACAddr.v[5] = 8;*/
HTTPSocket = TCPConnect(&remoteNode,SHOUTCAST_PORT);
if (HTTPSocket!=INVALID_SOCKET)
{
printf("\r\nHTTP: Listening");
state=HTTP_ST_WAIT_CONNECT;
timeout_counter=TickGet();
}
else
state = HTTP_ST_CONNECT;
break;
case HTTP_ST_WAIT_CONNECT:
timeout_counter=TickGet();
if (TCPIsConnected(HTTPSocket))
{
state=HTTP_ST_GET;
printf("\r\nHTTP: Connected");
write_lcd_char("u");
}
else
{
state=HTTP_ST_WAIT_CONNECT;
write_lcd_char("f");
}
break;
case HTTP_ST_GET:
if (TCPIsGetReady(HTTPSocket))
{
while (TCPGet(HTTPSocket, &c))
{
if ( (c=='\n') && (lc2=='\n') )
{
state=HTTP_ST_PUT;
printf("\r\nHTTP: Got Page Request");
}
lc2=lc;
lc=c;
}
}
break;
case HTTP_ST_PUT:
if (TCPIsPutReady(HTTPSocket)) {
printf("\r\nHTTP: Putting Page Response");
a0=read_adc();
#if STACK_USE_CCS_PICNET
set_adc_channel(1);
delay_us(20);
a1=read_adc();
set_adc_channel(0);
#endif
// sprintf(content, "<HTML><HEAD><TITLE>PICNET</TITLE></HEAD><BODY><H1>HELLiO</H1>");
sprintf(content,st_HostName);
sprintf(&content[0]+strlen(content),st_Message);
//sprintf(&content[0]+strlen(content),"<P>%s = 0x%X",STANDARD_ADC_STRING,a0);
// #if STACK_USE_CCS_PICNET
// sprintf(&content[0]+strlen(content),"<BR>AN1 = 0x%X",a1);
// #endif
// sprintf(&content[0]+strlen(content),"</BODY></HTML>");
//write_lcd_char(c);
printf(HTTPPut, "HTTP/1.1 200 OK\r\n");
printf(HTTPPut, "Content-Type: text/html\r\n");
printf(HTTPPut, "Content-Length: %u\r\n",strlen(content));
printf(HTTPPut, "\r\n");
printf(HTTPPut, "%s", content);
printf("\r\nHTTP: Flushing...");
TCPFlush(HTTPSocket);
printf("\r\nHTTP: Flushed!");
state=HTTP_ST_GET;
}
break;
case HTTP_ST_DISCONNECT:
if (TCPIsPutReady(HTTPSocket)) {
printf("\r\nHTTP: Force Disconnect");
TCPDisconnect(HTTPSocket);
state=HTTP_ST_WAIT_CONNECT;
}
break;
}
}
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The code for TCPIsConnected() is:
| Code: |
BOOL TCPIsConnected(TCP_SOCKET s)
{
return ( TCB[s].smState == TCP_ESTABLISHED );
}
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Any help is very much appreciated. |
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bkamen
Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA
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| Posted: Wed Oct 07, 2009 6:21 pm |
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You're using this as a client, not a server, right?
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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mazen82
Joined: 10 Sep 2009
Posts: 22
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| Posted: Thu Nov 05, 2009 7:20 am |
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| Yes, that is my intention. |
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bkamen
Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA
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| Posted: Thu Nov 05, 2009 2:53 pm |
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ok. So TCPConnect returns something valid... and then you spin inside your wait for connection. You need to find out if the packet got out.. and a reply came back.
Do you have WireShark?
It might be worthwhile to connect a hub or managed switch with a monitor port so you can monitor the network traffic between your PIC and the remote port.
I would say it's almost a requirement for this kind of development environment.
I've done HTTP server side stuff with the PIC, but not client side.
Get that set up and I'm sure when you see the traffic, (or don't see it) that things will become clear and move a lot faster.
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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