Re: [lwip-users] how to send udp messages circularly ?

[sirnails]

Hello gadfly,

Did you manage to implement "a udp client that only sends data to PC" ?

can you share code or give a noob a hint at where to start?

Cheers.
Sir


the_gadfly wrote:
> 
> The most strangely is that when  i run the udp_echo_server example ,it
> works ok ! But what i need is a udp client that only sends data to PC. I
> have tested it that code right now ,it works well.
> Does stand-alone lwip must be used based on callback function  ? 
> Here is what i did:
> 
> ---------- lwip_web_server.c--------------
> nt main(void)
> {
> //0.6.4 struct netif *netif;
> struct netif netif;
> struct ip_addr ipaddr, netmask, gw;
> //struct ip_addr udpDestIpAddr; 
> //struct pbuf  *p; 
> //struct udp_pcb *pcb; 
> //err_t err;
> //char Test[]="hello world !";
> unsigned int now, lasttime;
> int j=0;
> 
> 
> alt_avalon_lan91c111_if* dev_list_ptr =
> (alt_avalon_lan91c111_if*)alt_ethernet_device_list.next;
> 
> printf("UDP-server using Light-weight IP (LWIP)\n\n");
> 
> /* Initialize lwip */
> lwip_init();
> 
> printf ("Setting IP address to: %d.%d.%d.%d\n", IPADDR0, IPADDR1, IPADDR2,
> IPADDR3);
> printf ("Setting netmask to: %d.%d.%d.%d\n", NETMASK0, NETMASK1, NETMASK2,
> NETMASK3);
> printf ("Setting gateway address to: %d.%d.%d.%d\n\n\n", GWADDR0, GWADDR1,
> GWADDR2, GWADDR3);
> IP4_ADDR(&ipaddr, IPADDR0, IPADDR1, IPADDR2, IPADDR3);
> IP4_ADDR(&netmask, NETMASK0, NETMASK1, NETMASK2, NETMASK3);
> IP4_ADDR(&gw, GWADDR0, GWADDR1, GWADDR2, GWADDR3);
> 
> //0.6.4 netif = netif_add(&ipaddr, &netmask, &gw,
> netif_add(&netif, &ipaddr, &netmask,
> &gw,(void*)dev_list_ptr,lan91c111if_init, ip_input);
> //0.6.4 netif_set_default(&netif);
> netif_set_default(&netif);
> //IP4_ADDR(&udpDestIpAddr, 10, 1 ,1, 52);
> 
> 
> 
> udp_echo_init();        // defined in httpd.c
> 
> 
> 
> 
> 
> 
> /*
> p = pbuf_alloc(PBUF_TRANSPORT,sizeof(Test),PBUF_RAM);
> memcpy(p->payload, Test, sizeof(Test));
> 
> 
> pcb = udp_new(); 
> udp_bind(pcb, IP_ADDR_ANY, 60000); 
> udp_connect(pcb, &udpDestIpAddr, 60000); 
> 
> err=udp_send(pcb,p);
> if(err==ERR_OK)
> {printf("send ok !\n");}
> pbuf_free(p);
> udp_remove(pcb);
> 
> */
> lasttime = get_milliseconds();
> while(1)
> {
> 
> //0.6.4 lan91c111if_service(netif);
>         lan91c111if_service(&netif);
>   now = get_milliseconds();
>     if ((now - lasttime)*1000/alt_ticks_per_second()  > ARP_TMR_INTERVAL) 
>     {
>       lasttime = now;
>       etharp_tmr(); // Ever 10s execute etharp_tmr()
>     }
> 
> 
>       if (++j==1000) {
>         ip_reass_timer();
>         j=0;
>       }       
> 
>   
> } 
> 
> 
> }
> -----------------httpd.c------------------
> void udp_echo_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct
> ip_addr *addr, u16_t port) 
> {    struct ip_addr ipaddr;
>      IP4_ADDR(&ipaddr,10,1,1,52);
>      if (p != NULL)
>    { 
>      udp_connect(pcb,&ipaddr,60000);
>      udp_send(pcb, p); 
>      pbuf_free(p); 
>    } 
> } 
> 
> 
>  void udp_echo_init(void) 
> { 
>     struct udp_pcb * pcb; 
>     pcb = udp_new(); 
>     udp_bind(pcb, IP_ADDR_ANY, 60000) ;
>     udp_recv(pcb, udp_echo_recv, NULL); 
> } 
> 

-- 
View this message in context: 
http://www.nabble.com/how-to-send-udp-messages-circularly---tp24321123p25453430.html
Sent from the lwip-users mailing list archive at Nabble.com.