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Send announcement packets only if there are any announcements to send

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This commit is contained in:
adamdunkels 2009-03-23 21:00:25 +00:00
parent f4b8680174
commit 1cbc0f4ea9
1 changed files with 11 additions and 7 deletions
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18
core/net/mac/xmac.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: xmac.c,v 1.28 2009/03/12 21:58:20 adamdunkels Exp $
* $Id: xmac.c,v 1.29 2009/03/23 21:00:25 adamdunkels Exp $
*/
/**
@ -342,8 +342,12 @@ format_announcement(char *hdr)
adata->num++;
}
return ANNOUNCEMENT_MSG_HEADERLEN +
sizeof(struct announcement_data) * adata->num;
if(adata->num > 0) {
return ANNOUNCEMENT_MSG_HEADERLEN +
sizeof(struct announcement_data) * adata->num;
} else {
return 0;
}
}
#endif /* XMAC_CONF_ANNOUNCEMENTS */
/*---------------------------------------------------------------------------*/
@ -698,10 +702,10 @@ send_announcement(void *ptr)
announcement_len = format_announcement((char *)hdr +
sizeof(struct xmac_hdr));
packetbuf_set_datalen(sizeof(struct xmac_hdr) + announcement_len);
/* PRINTF("Sending probe\n");*/
radio->send(packetbuf_hdrptr(), packetbuf_totlen());
if(announcement_len > 0) {
packetbuf_set_datalen(sizeof(struct xmac_hdr) + announcement_len);
radio->send(packetbuf_hdrptr(), packetbuf_totlen());
}
}
/*---------------------------------------------------------------------------*/
static void