NDDS

Why do I see error 0x69 when using the multicast_mapping QoS?

When using the multicast_mapping QoS, you may encounter this error: NDDS_Transport_UDP_share_recvresource_rrEA:setsockopt(ADD_MEMBERSHIP) error 0X69 This error usually indicates that you've exhaused the kernel parameter called igmp_max_memberships on Linux-like operating systems. The default for ...
grayson
Wed, 08/14/2024 - 10:21
320 reads — 0 comments

What does the warning PRESWriterHistoryDriver_completeBeAsynchPub:!make_sample_reclaimable mean?

When using asynchronous publication and Best Effort reliability, you may see the warning: PRESWriterHistoryDriver_completeBeAsynchPub:!make_sample_reclaimable in topic 'MyTopic' This warning message may be caused by a small history depth you are configuring. Since you are using asynchronous ...
grayson
Mon, 03/27/2023 - 16:05
1286 reads — 0 comments

Verifying consistency between libraries and header files in Connext

The version of the Connext header files and Connext libraries is tied to each Connext release. The header files and libraries used for compiling your application must come from the same version of Connext. An inconsistency between versions might cause undefined behaviors such as segmentation faults ...
scardenete
Mon, 02/27/2023 - 03:26
1398 reads — 0 comments

Using RTI Connext DDS on the NVIDIA Jetson Nano

Preface: The vast majority of this article was extracted from a White Paper that RTI's Don Gochenour originally authored. Don is a Senior Application Engineer with extensive knowledge in embedded systems and RTI's products. Don is located on the East coast of the US. Introduction This content piece ...
garyb
Wed, 07/22/2020 - 17:26
5198 reads — 0 comments

QoS File XML Validation

This article illustrates how to enable XML validation in a QoS file. Many of the sample USER_QOS_PROFILES.xml files include an XML schema file (XSD) to assist in option selection (auto-completion) and syntax validation. Normally, this option is commented out by default. As an example, consider the ...
garyb
Thu, 12/05/2019 - 08:38
3747 reads — 0 comments

How to enable logging within Modern C++ code

This article overviews how to enable logging within Modern C++ code. Logging options are illustrated via a simple example with hyperlinks to the relevant online documentation. The available logging options include: Logging Verbosity Level Logging by Category Logging Print Format Logging to a single ...
garyb
Wed, 12/04/2019 - 06:30
5209 reads — 0 comments

Why am I receiving LOST_BY_WRITER?

You can find the definition of “LOST_BY_WRITER” in the API: “ A DDSDataWriter removed the sample before being received by the DDSDataReader. This constant is an extension to the DDS standard. ” If you are using KEEP_LAST as the History kind , the reason for this data loss might be the following: ...
isabel
Fri, 03/22/2019 - 00:51
5022 reads — 0 comments

Implications to set publish_with_original_info to true in Routing Service configuration

The default value for publish_with_original_info is false. When this property is set to false RTI Routing service will change the metadata fields Writer GUID and Sequence Number in every sample. As a consequence, the applications can not know the original source of the sample, that is the ID of the ...
israel
Wed, 10/26/2016 - 06:37
3898 reads — 0 comments

Effect of TRANSPORT_PRIORITY Qos Policy on the metatraffic (Heartbeats, Acks, Nacks, Gaps)

The TRANSPORT_PRIORITY DataWriter Qos Policy controls the transport-level priority settings. Each transport maps it to a transport-specific prioritization mechanism which in the case of UDP are the IP packet diffserv ToS/DSCP bits . Out-of-the box this feature is not enabled, but this forum thread ...
Gerardo Pardo
Tue, 02/11/2014 - 20:02
4372 reads — 0 comments

How can I reduce the latency of my data?

By default, RTI Connext DDS sends data with very low latency. However, the latency of your data depends on several factors, including: The latency of your network hardware The congestion on your network The priority of the threads that receive your data You may not be able to control your network, ...
rose
Thu, 06/13/2013 - 18:11
4767 reads — 0 comments

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