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  1. Hi, I'm trying to understand helloworld examples's rtps discovery protocol(SPDP and SEDP) using wireshark. I ran pub and sub on different VM connected each other. each VM has only one network interface(enp0s3). tested in ubuntu 16.04 desktop 64bit and DDS Community 6.7 1) when I dumped packets, there was a HEARTBEAT packet with writerEntityID 'ENTITYID_BUILTIN_PUBLICATIONS_WRITER' not only 'ENTITYID_BUILTIN_SUBSCRIPTIONS_WRITER'. but that HEARTBEAT packet was sent from helloworld subscriber program. I thought 'BUILTIN_PUBLICATIONS_WRITER' is entity that announces presence of publisher, isn't it? 2) and when I ran only one subscriber, there were many SPDP packets with different GUID prefix(more exactly different appId). so, these are intended implementation that creates unused 'BUILTIN_PUB/SUB_WRITER' and many participant with different GUID? or am I misunderstand RTPS spec? attached pcap file has two rtps pakcets, one with different guid pakcets and one with HEARTBEAT packets with 'PUB/SUB_WRITER'.