Hello, Hi Tim. Can you elaborate your previous point? Is it not possible to send data, the way i am sending it in my code?
Thanks & Best Regards, Sanchayan Maity. ----- Original Message ----- From: Tim Lambrix To: Mailing list for lwIP users Sent: Wednesday, June 22, 2011 20:45 Subject: Re: [lwip-users] Data sending problem over TCP The Stellaris examples run the lwIP from an interrupt context so be careful when and where you try to call data outside of the interrupt context. From: [email protected] [mailto:[email protected]] On Behalf Of Sanchayan Sent: Wednesday, June 22, 2011 7:35 AM To: Mailing list for lwIP users Subject: Re: [lwip-users] Data sending problem over TCP Hello, 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. Thanks & Best Regards, Sanchayan Maity. ----- Original Message ----- From: Tim Lambrix To: Mailing list for lwIP users 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: [email protected] [mailto:[email protected]] On Behalf Of Sanchayan Sent: Wednesday, June 22, 2011 4:55 AM To: lwip Cc: Hemant Subject: [lwip-users] Data sending problem over TCP Hi, 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. unsigned char buff[25]; struct tcp_pcb *my_pcb; 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; struct ip_addr ipaddr; 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 my_pcb = tcp_new(); 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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