Hi Christoph:
Indeed, I write the web server with socket api in lwIP. It responses http request with a dynamic web page ( fetch interval 1 second).
After it run, I open 10 IE to access the web serve (I make sure 10 clients could access the web server at same time )r, and keep that in pressure testing…
it had works in 3 days now , but I don’t think it is enough.
Vincent Cui
Sr.Firmware Engineer
Mobile: +8613482482211
Tel: +86 21 34612525x6104
Fax: +86 21 34619770
E-Mail: address@hidden
Shanghai EnLogic Electric Technology Co., Ltd.
Address: 1104-1106, Building A, No.391, Guiping Road, Xuhui District, Shanghai, 200233
http://www.enlogic.com
From: lwip-users-bounces+address@hidden [mailto:lwip-users-bounces+address@hidden
On Behalf Of Christoph Kronen
Sent: 2011年8月30日
15:31
To: Mailing list for lwIP users
Subject: Re: [lwip-users] FreeRTOS / lwip multiple connections
Hi Vincent,
I changed the receiving process to be nonblocking, it wasn't like this in the first place. The code below has the same entry point as your "vHandler_HTTP(__pstNewConn);", it gets called when the connection is already established.
My problem was the following: I needed to check for new data received via Ethernet as well as new data from a Sendqueue in the same task. So netconn_recv() could not be blocking. In another topic, Simon Goldschmitt suggested to use lwIP 1.3.1 and to set "LWIP_SO_RCVTIMEO"
to make netconn_recv() nonblocking. Unfortunately this crashed my Sam7X all the time.
So what I do now, is to peek into the receive mailbox and only if there is data I start the netconn_recv() process. Probably horrible programming, but it works for now.
Richard suggested to use semaphores on TCP events, that sounds much cleaner and I will definitely try to do it that way. But then I would need a FreeRTOS function like "WaitForMultipleObjects", since the Task needs to wake up for either a TCP event semaphore
OR a new element in my SendQueue.
The CommandInterpreter from Richards socket example (thanks !) works for my Sam7X and I am in the process of rewriting it to have the same functionality as the code below.
@Vincent: You said your webserver is able to have multiple connections, could you give me a tip on that ? Do you have a small code example for "multiconnection socket" part ?
Thank you very much,
Christoph
static void vProcessSpeedtest( struct netconn *pxNetCon )
{
struct netbuf *pxRxBuffer;
struct pbuf *dummybuffer;
unsigned char *pcRxString;
xTCP_TXBuff * TXPointer = 0;
unsigned short usLength;
while (1)
{
// Peek into the Receive mailbox
if ( pdTRUE == xQueuePeek((pxNetCon->recvmbox),&dummybuffer,0))
{
pxRxBuffer = netconn_recv( pxNetCon );
if( pxRxBuffer != NULL )
{
do
{
netbuf_data( pxRxBuffer, ( void * ) &pcRxString, &usLength );
//use the incoming data at this point
} while ( netbuf_next(pxRxBuffer) >=0 );
netbuf_delete( pxRxBuffer );
}
else break;
}
// Check the Transmit Queue for Data and send it
if ( xQueueReceive( xTXPointerQueue, &TXPointer, 0 ))
{
netconn_write(pxNetCon, TXPointer->data, TXPointer->length, NETCONN_NOFLAG);
vFreeTCPBuffer(TXPointer);
}
vTaskDelay( 1 / portTICK_RATE_MS );
}
netconn_close( pxNetCon );
}
-------- Original-Nachricht --------
Datum: Tue, 30 Aug 2011 03:28:07 +0000
Von: vincent cui <address@hidden>
An: Mailing list for lwIP users <address@hidden>
Betreff: Re: [lwip-users] FreeRTOS / lwip multiple connections
Hi Chistoph:
The "lwIP Embedded Webserver Demo" is what I took as a starting point. I removed the webserver functionality, now I have a task that
-
checks for incoming data (nonblocking)
-
checks a Queue for outgoing data (nonblocking)
-
wait 1 ms (to prevent 100% cpu usage)
the LwIP webserver demo code is following, I don’t know how do you infer it is noblocking for incoming data and outgoing ….
Where to wait 1 ms .
void WebServer_Handler(void *pdata)
{
struct netconn *__pstConn, *__pstNewConn;
__pstConn = netconn_new(NETCONN_TCP);
netconn_bind(__pstConn, NULL,80);
netconn_listen(__pstConn);
for(;;)
{
__pstNewConn = netconn_accept(__pstConn);
if(__pstNewConn != NULL)
{
vHandler_HTTP(__pstNewConn);
while(netconn_delete(__pstNewConn) != ERR_OK)
{
vTaskDelay(10);
}
}
}
}
Vincent Cui
Sr.Firmware Engineer
Mobile: +8613482482211
Tel: +86 21 34612525x6104
Fax: +86 21 34619770
E-Mail:
address@hidden
Shanghai EnLogic Electric Technology Co., Ltd.
Address: 1104-1106, Building A, No.391, Guiping Road, Xuhui District, Shanghai, 200233
http://www.enlogic.com
Hi all,
I am using FreeRTOS 7.0.1 on a Sam7X512 and upgraded the contributed port lwIP 1.3.0 to 1.3.2.
The "lwIP Embedded Webserver Demo" is what I took as a starting point. I removed the webserver functionality, now I have a task that
-
checks for incoming data (nonblocking)
-
checks a Queue for outgoing data (nonblocking)
-
wait 1 ms (to prevent 100% cpu usage)
This works pretty well, I get around 1400 kbyte/s RX and TX.
Now to my question: Is it possible/difficult/easy to transform this functionality to accept multiple connections on the same port ? At the moment I am using the netconn API, so I guess I have to switch to the Socket API ?
I read through Richards thread on his "FreeRTOS/lwip Win32 simulator" project and it sounds as if it is quite difficult to have multiple connections in a multithreaded environment. Unfortunately I could not find other helpful topics or contributed examples.
I am rather new to FreeRTOS and lwIP, so please excuse me if I am missing something obvious :-)
Please give me some comments / suggestions / tips / pushes into the right direction.
Thank you very much !
Christoph