Getting Started - (DDS) Community RTI Connext Users

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Chapter 5❏ Windows: \rti (where is where Wiresharkis installed)By looking at these sample files, you will learn how to:❏ Load a captured sequence of packets from a file.❏ Understand the flow of RTPS messages by looking at a sample sequence.❏ View the contents of individual RTPS packets.Note: these sample traces were taken with a beta version of RTI Data Distribution Service(4.0f), which used RTPS 1.1. The protocol used in RTI Data Distribution Service 4.2 andhigher uses RTPS 2.x. Therefore, the actual sequence of packets exchanged will be differentin your traces. These samples are provided only to show you how to read a sequenceof RTPS packets.5.3.1 Analyzing the User Data Sample TraceUse the File, Open... command to open the file, userDataTrace.pkt (see Section 5.3 for itslocation).The sample file contains a sequence of RTPS packets that illustrate the protocol whentwo RTI Data Distribution Service 4.0 applications use reliable communications to send/receive data.This scenario involves two hosts, each running one RTI Data Distribution Service application.❏ Host 1 (10.10.100.2, named kirkwood) is running an RTI Data Distribution Servicepublishing application, App1.❏ Host 2 (10.10.50.247, named kootenay) is running an RTI Data Distribution Servicesubscribing application, App2.❏ The QoS for the writer and reader have been set up to use Reliable communications.❏ App1 writes user data every 4 seconds.To create the sample capture file, Wireshark started capturing packets on the subscribinghost (kirkwood) after the discovery process completed, using the following capture filter:udp and src or dst kootenay5-12
5.3 Analyzing Packets from RTI Data Distribution Service ApplicationsFigure 5.6 shows the packets captured by Wireshark, which includes three types of RTPSpackets:❏ Data from the writer to the reader❏ Acknowledgements from the reader to the writer❏ Heartbeats sent regularly from the writer to the readerTable 5.4 and Figure 5.7 describe the trace.Figure 5.6User Data Sample PacketsTable 5.4Analysis of User Data Sample TraceDirection Packet # DescriptionApp1 → App2App1 ← App2 3App1 → App2Data packet sent to the reader (NOKEY_DATA submessage).Packet has sequence number = 60 (expand the protocol tree in the1Packet Details pane and check the writerSeqNumber value, as seenin Figure 5.8).2 HEARTBEAT from writer to readerACKNACK to acknowledge all data packets up to (but notincluding) sequence number 61 (expand the protocol tree in thePacket Details pane and check the 'readerSNState.bitmapBase'value).4 Another data packet (sequence number 61).5 HEARTBEAT from writer to reader.App1 ← App2 6 Acknowledges packet #4.App1 → App27 Another data packet (sequence number 62).8 HEARTBEAT from writer to reader.App1 ← App2 9 ACKNACK to acknowledge packet #7.5. Analyzing Packets5-13
Page 3 and 4: Contents1 Introduction ............
Page 5 and 6: 1. IntroductionChapter 1Introductio
Page 7 and 8: 1.1 Available Documentation1.1 Avai
Page 9 and 10: Chapter 2InstallationTo install Wir
Page 11 and 12: Chapter 3Starting WiresharkImportan
Page 13 and 14: Chapter 4Capturing RTPS PacketsThis
Page 15 and 16: Table 4.1Example Capture FiltersTo
Page 17 and 18: Chapter 5Analyzing RTPS PacketsThis
Page 19 and 20: 5.2 Displaying PacketsTable 5.1RTPS
Page 21 and 22: 5.2 Displaying PacketsTo display RT
Page 23 and 24: 5.2 Displaying PacketsWireshark als
Page 25 and 26: 5.2 Displaying PacketsTable 5.2Disp
Page 27: 5.3 Analyzing Packets from RTI Data
Page 31 and 32: 5.3 Analyzing Packets from RTI Data
Page 37 and 38: 6. Practical UsesChapter 6Practical
Page 39 and 40: 6.2 Visualizing Your SystemNOTE: RT
Page 41 and 42: 6.3 Providing Information to RTI Su

Getting Started - (DDS) Community RTI Connext Users

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