Solutions

Using UDP for discovery and TCP for user data

RTI Connext DDS allows you to use different transports for communication between endpoints in your application (e.g., shared memory, UDP, TCP, etc.). You can take advantage of this flexibility and use different transports for discovery data and user data in the same application. This article shows ...
Pralhad Sapre
Thu, 09/07/2017 - 14:42
12548 reads — 0 comments

Modern C++ API: why doesn't my DomainParticipant (or other entity) get deleted?

In the Connext DDS modern C++ API, many entities are "reference types" with an automatic lifecycle management based on a shared count (see API documentation ) . Most times you don't need to worry about deleting entities as long as their scope is well defined. However, some times you can forget to ...
alexc
Fri, 09/01/2017 - 14:40
6580 reads — 0 comments

How to install Ada Language Support and run DDS Ada examples

Note: Applies to RTI Connext DDS 5.2.0 and above. For the purposes of this article we will assume that: You are familiar with the installation process of RTI Connext DDS. If not, see the instructional video in https://www.rti.com/gettingstarted/installlinux . You are trying to install version 5.3.0 ...
Vlad
Fri, 08/11/2017 - 16:59
5083 reads — 0 comments

How to generate code for a base and derived IDL in separate DLL files

Note: Applies to RTI Connext DDS 5.2.0 and above. RTI Code Generator has an option called -dllExportMacroSuffix <suffix> , which allows you to configure the macro suffix used to export type plugin symbols when building a Windows DLL. This feature is particularly useful if you want to place ...
Francisco Porcel
Mon, 07/31/2017 - 10:52
8062 reads — 0 comments

How to capture traffic if my Connext DDS applications are communicating through shared memory

Wireshark and tcpdump are very powerful tools which you can use to capture traffic. They may come in handy when debugging issues with your DDS applications. These tools can capture all kinds of packets: RTPS, UDP, TCP, IP… However, they cannot capture traffic if your applications are communicating ...
Francisco Porcel
Fri, 07/28/2017 - 07:38
60737 reads — 0 comments

Configuring DDS to mitigate performance degradation due to packet loss

If you are using Reliable communication, you could see a performance degradation due to packet loss and resending data sample fragments. This is more probable when using data bigger than 1500 Bytes (over Ethernet). In general, a DDS application using a transport such as UDPv4 splits data samples ...
sara
Wed, 07/19/2017 - 02:29
8733 reads — 0 comments

I am not receiving samples, could it be IP fragmentation?

What is IP fragmentation? IP Fragmentation occurs when the payload provided from the transport layer (typically UDP or TCP) exceeds the maximum payload that fits in a single Ethernet Frame (a.k.a. MTU). When the receiver NIC gets IP fragments, it stores them in a buffer until all the fragments are ...
Francisco Porcel
Wed, 07/05/2017 - 07:05
17466 reads — 0 comments

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