[Contiki-developers] Announcements

[Ana B. <Ana...@im...>]

Hi,

I read about the announcement module´s  way of functioning. Moreover ,I 
have understood that the maximum number of announcements in a single 
announcement message is 10 (default, may be increased) . Then, the 
contikimac, cxmac, lpp  have their own back-end announcements .

i.e contikimac :
1. we register for a listen callback announcement
2. we send announcements in the ANNOUNCEMENT PERIOD (random_rand() 
%(ANNOUNCEMENT_PERIOD))

#if CONTIKIMAC_CONF_ANNOUNCEMENTS
   announcement_register_listen_callback(listen_callback);
   ctimer_set(&announcement_cycle_ctimer, ANNOUNCEMENT_TIME,
              cycle_announcement, NULL);
#endif /* CONTIKIMAC_CONF_ANNOUNCEMENTS */
}

_Usage_ : I have notice that with RPL it makes evolute the ETX by 
evaluating the link, function handled by core/net/neighbor-info.c


_Confusion_ : Do the rdc macs (contikimac , cxmac, lpp) treat the 
announcement message(10 data registered) as a single data packet at mac 
level ? or each
  announcement data : (id,value)  is send individually.
  i.e. annoucement1 ,time_interpacket,annoucement2, ...announcement 10

Thank you in advance .


Regards,
Ana B.