RTI Core Libraries and Utilities

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
19207 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
5856 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
10699 reads — 0 comments

How to Set the DSCP Flag in Your System

DSCP (Differentiated Services Code Point) is a series of bits in the IP header for classification purposes. These bits specify the precedence value of the packet, the drop probability, and the network service used. ...
isabel
Fri, 04/07/2017 - 02:52
22622 reads — 0 comments

Why do I get the error "RTI Data Distribution Service No source for License information"?

The error "RTI Data Distribution Service No source for License information" happens when the license file cannot be found or the license has expired. If that is the case, the user application will be unable to initialize Connext DDS, depending on the terms of the license. You can trigger this error ...
Sandra Rodriguez
Tue, 01/10/2017 - 08:07
22276 reads — 0 comments

Modern C++ API with GCC > 5.1 in Connext 5.2.x

GCC 5.1 introduced a new version of libstdc++ with a library ABI that includes new implementations of std::string and std::list (see in GCC online documentation). This new ABI breaks backwards compatibility with applications and libraries linked against older versions of libstdc++ using std::string ...
israel
Wed, 01/04/2017 - 08:08
4661 reads — 0 comments

How do I load QoS profiles via source code in Modern C++?

It is possible to create an Entity (a DataReader , DataWriter, or DomainParticipant ) with a QoS profile defined in the USER_QOS_PROFILES.xml file. In the Java, C, Traditional C++ and .NET APIs, there are methods such as: DDS_Publisher_create_datawriter_with_profile() Depending on what kind of ...
israel
Fri, 12/23/2016 - 06:57
4676 reads — 0 comments

Interoperability Connext DDS Micro DPSE - Connext DDS Professional

RTI Connext DDS Micro provides two ways of determining endpoint information of other DomainParticipants: Dynamic Endpoint Discovery , and Static Endpoint Discovery . Dynamic endpoint discovery uses the DDS Simple Discovery Protocol, which uses builtin discovery DataWriters and DataReaders to ...
francisco
Fri, 12/09/2016 - 06:06
6810 reads — 2 comments

TypeObject and TypeCode

TypeObject and TypeCode support in RTI Connext DDS During the matching process , RTI Connext DDS compares the structure of the topic types provided by the DataWriters and DataReaders to determine if they can communicate. To do so, the TypeObject or TypeCode is needed. If the TypeObject or TypeCode ...
Francisco Porcel
Fri, 11/25/2016 - 05:50
8633 reads — 3 comments

Communicating DDS Entities with different type bounds

By default, a DataWriter of an unbounded type won’t be able to communicate with a DataReader of a bounded type. DDS includes the max size of a bounded type as part of the data type information (known as TypeCode or TypeObject). Since the data type information is used during the Discovery phase, if ...
Valentin Perez
Fri, 11/25/2016 - 01:08
3017 reads — 0 comments

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