Hi Chen,
I'm working on a similiar project : basic echo server with FreeRTOS, but me I
use the netconn_* API. Right now it accepts only one connection, but I must
program the server to allow multiple socket simultaneously, like you need to.
By the way i'm very new into socket programming.
I did'nt tried anything yet but thought of ways to acheive that:
a.. bind every port/address you need, then listen to them.
b.. create a task that waits for client to connect;
c.. once a client connected, this task should start/resume the echo server
task (which shall be the same code for every connections)
d.. Try to share and manage lwIP ressource between all tasks.
good luck
Francois
----- Original Message -----
From: Chen
To: [email protected]
Sent: Friday, February 13, 2009 10:50 AM
Subject: Re: [lwip-users] Struggling to build a TCP echo server
First, thanks to all the helping hands from the group!
Weighing my options, I decided to use "real" socket programming instead of
TCI_* raw APIs.
Attached is the codes of a working echo server, running on FreeRTOS.
After getting it to work, I tried to implement two echo servers on FreeRTOS.
I duplicated the codes to a different thread, on a different port, and fired
it up, none worked. It seems as long as I have one socket opened, the other
will not be able to work.
Any suggestion?
>>>>>>>> Working Echo Server >>>>>>>>>>>>>>>
int lSocket;
struct sockaddr_in sLocalAddr;
lSocket = socket(AF_INET, SOCK_STREAM, 0);
memset((char *)&sLocalAddr, 0, sizeof(sLocalAddr));
sLocalAddr.sin_family = AF_INET;
sLocalAddr.sin_len = sizeof(sLocalAddr);
sLocalAddr.sin_addr.s_addr = htonl(INADDR_ANY);
sLocalAddr.sin_port = TFTP_PORT;
bind(lSocket, (struct sockaddr *)&sLocalAddr, sizeof(sLocalAddr));
lwip_listen(lSocket, 20);
while (1) {
int clientfd;
struct sockaddr_in client_addr;
int addrlen=sizeof(client_addr);
clientfd = lwip_accept(lSocket, (struct sockaddr*)&client_addr,
(socklen_t)&addrlen);
if (clientfd>0){
char buffer[1024];
int nbytes;
do{
nbytes=lwip_recv(clientfd, buffer, sizeof(buffer),0);
if (nbytes>0)
lwip_send(clientfd, buffer, nbytes, 0);
}
while (nbytes>0 && strncmp("bye\r", buffer, 4) !=0);
close(clientfd);
}
}
Date: Thu, 05 Feb 2009 19:22:05 +0100
From: "[email protected]" <[email protected]>
Subject: Re: [lwip-users] Struggling to build a TCP echo server
To: Mailing list for lwIP users <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Chen wrote:
> Could you show me how to get to the download section to get the sample
> mentioned by Simon?
http://savannah.nongnu.org/projects/lwip/ -> 'Downloads' in the upper
navigation row. After unpacking contrib, the HTTP server is in
apps/httpserver_raw/
Simon
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