use site-local multicast group
use site-local multicast group

gebart/libcoap,authmillenon/libcoap,gebart/libcoap,alexaring/libcoap,nmacs/libcoap,OlegHahm/libcoap,fredericgermain/libcoap,pabigot/libcoap,alexaring/libcoap,nmacs/libcoap,joaopedrotaveira/libcoap,pabigot/libcoap,gebart/libcoap,fredericgermain/libcoap,pabigot/libcoap,markushx/libcoap,markushx/libcoap,OlegHahm/libcoap,alexaring/libcoap,PolymorhicCode/libcoap,RIOT-OS/libcoap,authmillenon/libcoap,joaopedrotaveira/libcoap,joaopedrotaveira/libcoap,OlegHahm/libcoap,thecodemaiden/libcoap-fork,sgso/libcoap,sgso/libcoap,RIOT-OS/libcoap,sgso/libcoap,thecodemaiden/libcoap-fork,authmillenon/libcoap,nmacs/libcoap,markushx/libcoap,fredericgermain/libcoap