//TRACE("..MC %s joined multicast group %.16llx/%s via %s",member.toString().c_str(),nwid,mg.toString().c_str(),((learnedFrom) ? learnedFrom.toString().c_str() : "(direct)"));
// Try to send to any outgoing multicasts that are waiting for more recipients
// TODO / LEGACY: don't send new multicast frame to old peers (if we know their version)