trySend:
			int sent;
			{
				int skt = socket(AF_INET, SOCK_DGRAM, 0);
				sockaddr_in  src_addr;
				memset(&src_addr, 0, sizeof src_addr);
				src_addr.sin_family      = AF_INET;
				src_addr.sin_addr.s_addr = htonl(f.fSrcHost.toIPv4Address());
				src_addr.sin_port        = 0;
				sockaddr_in  dst_addr;
				memset(&dst_addr, 0, sizeof dst_addr);
				dst_addr.sin_family      = AF_INET;
				dst_addr.sin_addr.s_addr = htonl(f.fHost.toIPv4Address());
				dst_addr.sin_port        = htons(MDK_CMD_UDP_PORT);
				if (bind(skt, (sockaddr *)&src_addr, sizeof src_addr) == -1) DLOG_PF("bind: %1", errno);
				sent = sendto(skt, dg.data(), dg.size(), 0, (sockaddr *)&dst_addr, sizeof dst_addr);
				close(skt);
				++pktCnt;
				pktSize += dg.size();
			}
			if ((sent != dg.size()))
				DLOG_PF("sendto error %1 %2 %3 [%4 %5]", sent, dg.size(), errno, pktCnt, pktSize);
			if (errno == ENOBUFS)
			{
				DLOG_PF("ENOBUFS sleep");
				sleep(1);
				goto trySend;
			}