There will be a web server, but data will also have to be send from a different context in my project, other than the web server. The web server i have already implemented.
Sent: Wednesday, June 22, 2011 16:44
Subject: Re: [lwip-users] Data sending problem over TCP
I am no expert with lwIP but should a server be calling the tcp_connect function? I thought the server just listened for client connects.
Take a look at the example code for the enet_lwip example project in the LM3S6965 Eval board as the project is set up to be a simple example web server.
From:
lwip-users-bounces+address@hidden [mailto:lwip-users-bounces+address@hidden
On Behalf Of Sanchayan
Sent: Wednesday, June 22, 2011 4:55 AM
To: lwip
Cc: Hemant
Subject: [lwip-users] Data sending problem over TCP
I am trying to implement a web server with lwip on LM3S6965 Stellaris Cortex M3 Micro Controller and also need to sent anywhere from 25 to 4000 bytes of data over TCP from
my board. Right now, i am trying to send a few bytes of data, on a switch press over the board, but i am not being able to send it. I can't see my packets in Wireshark. Below is the code, i have written. Can someone help me out, as to what i am doing wrong
or additonal things i need to do. Attached is the wireshark file, when the function gets executed. This is all i get.
void send_my_data( void );
static void close_my_conn( struct tcp_pcb *pcb );
void send_my_data( void ) // This function gets called when i press the switch.
{
unsigned long myipaddr;
err_t err;
err_t write_error;
myipaddr = 0x0A110258; // The IP address 10.17.2.88 to which i need to send the data
ipaddr.addr = htonl( myipaddr );
buff[0] = 0x31;
buff[1] = 0x32;
buff[2] = 0x33;
buff[3] = 0x34;
buff[4] = 0x35;
buff[5] = 0x36; // The data i need to send
tcp_bind( my_pcb, IP_ADDR_ANY, 2101 ); // Bind to any local address the board has been assigned
err = tcp_connect( my_pcb, &ipaddr, 2101, NULL );
write_error = tcp_write( my_pcb, buff, 6, 0 ); // I Get a return value of 0 for both err and write_error when i check in my Keil debugger for MCU
tcp_output( my_pcb ); // I need to send the 6 bytes in buff array over TCP
if( ( err == ERR_MEM ) & ( write_error ) )
{
close_my_conn( my_pcb );
}
}
static void close_my_conn( struct tcp_pcb *pcb )
{
tcp_arg( pcb, NULL );
tcp_sent( pcb, NULL );
tcp_recv( pcb, NULL );
tcp_close( pcb );
}
Thanks & Best Regards,
Sanchayan Maity.
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