Re: [Contiki-developers] UDP Broadcast

[sharp t. <sh...@re...>]

Thanks a lot Nicolas. So I can create a handshake once I have the value 

received with broadcast receive??





On Wed, 15 Dec 2010 20:48:11 +0530  wrote

>

    sharp than skrev 2010-12-14 18:51:

    Hi all,



      



      I am trying to implement a IPv6 broadcast using the uIP stack. Is

      there 



      any examples available that shows how to do this? I just want to

      send a 



      hello message as broadcast and the first one to receive it should

      answer 



      with an acknowledgement.



      Another confusing aspect is there is this Rime layer. I dont

      understand 



      if I should use this to do the broadcast or the uip_udp_send().



      



      Thanks for the help!



      



      Sharp



      

        

          

            



            

          

        

      

    

    



    There is no need to be concerned with the Rime stack. It is a

    separate networking stack that usually does not run in conjunction

    with IP.



    



    IPv6 broadcasting can be done as outlined below.



    



    Nicolas



    



    /* Start of example */



    



    #define BROADCAST_PORT 10000



    



    static struct uip_udp_conn *broadcast_conn;



    



    static void



    send_broadcast(char *buf, int size)



    {



     

    uip_create_linklocal_allnodes_mcast(&broadcast_conn->ripaddr);



      uip_udp_packet_send(broadcast_conn, buf, size);



      uip_create_unspecified(&broadcast_conn->ripaddr);



    }



    



    static void



    broadcast_recv(void)



    {



      printf("received a broadcast of %d bytes: %s\n", uip_datalen(),

    uip_appdata);



    }



    



    PROCESS_THREAD(main_thread, ev, data)



    {



      PROCESS_BEGIN();



    



      broadcast_conn = udp_broadcast_new(HTONS(BROADCAST_PORT), NULL);



    



      /* if(node_id == X) send_broadcast("Hello", sizeof("Hello")); */



    



      while(1) {



        PROCESS_WAIT_EVENT_UNTIL(ev == tcpip_event);



        if(uip_newdata()) {



          if(data == broadcast_conn) {



            broadcast_recv();



          }



        }



      }



    



    exit:



      uip_udp_remove(broadcast_conn);



    



      PROCESS_END();



    }



    



    /* End of example */



  



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